I cannot thank you enough for your video on using the green fan wire plugged into the c slot to power the thermostat. I would have never thought of that in a million years. My nest was a mess. No decent power supply. The adjustment I made based on your video was done minutes before the ac tech was due to arrive for my summer ac check up. Had I not done this work around the tech would not have been able to due the check up. The standard visit for a check up is 60 dollars. The charge for diagnosis of a problem is 90 dollars. Your advise saved me 90 dollars!! Thank you so very much. Dan Las Vegas.
Simple and to the point! I spent hours asking folks at Home Depot, etc, and searched the web reading about its possible to use the green wire as C wire but was confusing, wasn't sure if I need to bridge green with C or how to do it. This answered all my questions as a noob and save some serious $$ booking an HVAC "specialist" for a home visit/ thermostat install. Thank you!
Amazing!!! After watching this video I was able to switch the 2 wires in a couple of minutes. It was exactly as described. I am a visual learner and the white board you used was perfect. The symptom of my Nest was it would turn on and turn off right away over and over. This fixed that. Tks so much!!!
This tip worked for me!!!! Last night was the first night I really needed heat in the house since I installed my Nest. I was freaking out because we were cold this morning and the Nest kept saying delayed for 2:30 and the furnace wouldn't stay on for more than 60 seconds. Now... the house is getting warm with the furnace running until the room hits temperature. A most sincere thank you to you from me, my wife, my children, and my pets. We won't freeze again tonight.
That's sounds awful. Why would Nest make a system that isn't transferable from existing systems with the same electronics? Is the C wire for wifi/app control?
I did exactly as you said. When I turned on the circuit breaker, seen the new wiring update on my nest. I tried the heat, check it’s working and air is coming out of registers. When I tried the central air conditioning, the a/c came on but not the blower! I turned off the circuit breakers, rechecked my work, everything looked good, turned on again with the same results, no blower for a/c. Do I need to check anything on the a/c compressor? Any suggestions would be welcomed!!
This is a great solution for those who have only four wires running from the thermostat to the furnace/blower unit; however, it's been my experience that most electricians will use a cable with six or seven wires and just not use them all. The easiest solution is that, if you have this situation, connect the black (common) wire to the Nest, and go to the furnace/blower, and connect the black wire to the common terminal. Another solution (if you don't want to sacrifice the functionality of turning on and off the fan from the Nest) is to use your old (4-wire) thermostat cable to pull a new 6-wire thermostat cable. Securely loop individual wires form the old cable to the new one and then tape over the connect so you have a smooth surface to pass over any tight spots along the root. Go to the attic/basement/furnace closet and use the old wire to pull the new one through the wall/floor/ceiling, etc. and connect it as diagramed here.
Thank you. I have had my Nest set up for years, but never had cooling working. Heating has been fine. I watched 2 minutes. Went to my Nest, made the changes, and we have cooling. Thank you..... My family thanks you too....
Makes perfect sense - now to find out how to get into my damn furnace! I went up in the attic and I couldn't find the control board to save my life...all while baking in the heat. LOL
I like your videos, they are very clear. I have a question, my air handler has two wires on the C terminal but my Nest thermostats C terminal doesn't have a wire on it, can I put a third wire on the C terminal on my air handler and run it to the C terminal on my Nest thermostat?
Hi. I have a blue wire not used at the thermostat hole but not used on my existing thermostat, can i just make sure its connected to "c" at the furnace or if not, just connect it at the furnace to "c"?
@@jsordaz i chased it to the furnace, there was no circuit board as it was just hard wired into the other wires. I found that it was connected to the condenser circuit and furnace power so it was live. So i just connected it to my thermostat and it worked.
@@FranklinDBluth-yq6ww, thank you. I have a Common wire terminal in my thermostat relay and on my boiler circuit board. I am going to try to connect the unused blue wire (in the wall) to the COM terminal in the thermostat relay. Theoretically it should work to power the Nest Thermostat E.
i also have a orange wire... does it go in the OB slot? i have yellow (y1), green(g), orange(ob), white(w1), blue(c), and red(rh).... do i need to swap my rh to rc?
great information but looking at some other video and some are saying to use a jumper to Y and G on the control board @ the Furnace any help on that ...
Thank you for your helpful video with an excellent description of what to look for and how to fix the common wire problem. I was able to pull a new thermostat wire from my unit in the basement up to the thermostat and using the wiring diagram figure out the common wire and add power to my Nest thermostat. It had worked for about 2 years but with the heating system and Hot water heat, not running the fan, my battery was low on voltage. Fixed for the cost of a new wire.
Sir, I have been looking at your video/issues regarding no C wire and like many, I purchased a Nest Thermostat. This issue is very prevalent on Oahu, these track homes dont usually have the C-Wire for a thermostat, to be fair because in the past we didnt need a C wire for these 20th century mercury-type thermostats, now we do... Just about about 3 months ago we finally installed after 20 years, we replaced our Rheem Central Air Unit up in the attic and the fan module in the back yard. Typically these track homes here, the builders here always put the "minimal" units to these new track homes. Anyway, we have this,"Haus-beast mode Ac Unit" now and it sounds like a jet starting up with all the cool air blowing through our large home, even to our farthest rooms in the home downstairs...nice...Sir, but again we didnt have a C-wire so the new installers weren't able to hook up my Nest Thermostat and just put our old battery thermostat for now. I really was considering your other incredible video with the plug-in transformer but to me sir, having a transformer is just so ghetto(for me) I can do what you illustrate on your other transformer video because it is so simple since I have an outlet just below the thermostat area upstairs but again to me, it just doesn't look good and it takes an outlet socket away from our daily chores and what not.......BUT Honestly Sir....I know i can do this...I just need to go up into the attic and switch out the fan wire(because frankly, for over 20 years NEVER i have used our fan option, no one has on Oahu...) and reroute it onto the C-wire on main unit in the attic and Nest....Im am a UA-camr advocate repair guy, i too also have some How To Videos to help out. Wish me luck...ill be turning off all the voltage when i make this upgrade..Mahalo...ill let you know...your video looks so painfully easy...Just follow the yellow brick road....Mahalo Again Dana
Hi, Thank you for the info, I live in a hot climate city so I don't really need the heat function... Is it ok to use this solution on the W wire rather than the fan ? Thank you in advance..
you can use it on any wire just know that whatever wire you move to the C terminal you will lose that functionality, all wires are the same its just a matter of what terminal its connected to dont let the colors intimidate you. Hope this helps!
I have a Nest E thermostat but only 2 wires coming in so no power, am thinking of adding and external transformer but the transformer has 2 wires . One will go into the C terminal, but where does the other wire go, the Nest E has no other R labeled slots? Do I just cap the wire? Great presentation. Thanks for any help.
Very informative. Question what happen if you have a blue wire instead of yellow??, I used the blue as a yellow it work until today it gave me a message saying e75 ??
Excellent idea. However I don’t have a C terminal on my HVAC 2 stage Trane. Connected I have a W3, W2, W1, G, Y2, Y1, R, B, Yo. Open I have BK and O. Can I use my green cable connected to the G terminal to either the BK or O terminals to my WiFi C terminal? I have to add a C wire for my two stage ac to work properly. A million thanks in advance!!!
Thank you! This fixed my problem! I installed a nest e thermostat late last spring. When in cooling mode, my draft inducer fan (for heating) was turning off and on continuously when the air conditioner was running. After what you said about sometimes using the "common" wire, it turns out that I had to connect the blue wire to the "C" terminal and also to the "C" terminal on the furnace circuit board. My old t-stat did not use this wire. The nest e directions did not require me to do this. It solved my issue, no more draft inducer fan running during the cooling mode. THANKS!
I think I’m in the same boat. My 5th wire is blue and unused at the thermostat and at the furnace. I’m planning to use it as a common. There are already two white wires connected to the common screw at the furnace (probably to the AC and to the humidifier like you said). Sounds like it is okay hook up a third wire (blue) to the common screw. Sound right?
I have the thermostat installed into my AC unit. The heat is separate. The heat has a control unit that has all the terminals nicely labeled. But the AC unit doesn’t have a control box like that. Everything is wired directly to the relays and transformers. Any suggestion on where I could install the C/Common (ground) wire too?
Hey man, live the videos. I have a current Trane comfortlink thermostat with three wires, D,R,B. Do you think it’ll be compatible with a nest? There are extra wires that I could use for common.
Only two wires on a hot water boiler, can I use the new Nest thermostat without any modifications? I have the gen 3 in the house but bought a basic Thermostat today at HD and now concerned that it won’t work without another power wire? Mine are W and Rh
Each time you mentioned the C wire and G connection it was helpful, but as you mentioned earlier a heat pump might be different so you might have wanted to say something added about the fan not being needed because the furnace turns on the fan "Except" when you have a heat pump and the fan is turned on without the furnace or compressor to circulate air when minor changes in temp are only needed which saves money!
Very good. Just one thing. Several other sites explain this workaround too. They also note to put a jumper wire between Y and G on the Furnace Control Panel. I see you did not though. Can you clarify if you need to do this or not?
@@OneHourSmartHome No disrespect intended. Here are two different sites that say you do need to. So just asking again or can you explain why no need please? malekservice.com/need-c-wire-thermostat/ m.ua-cam.com/video/nki-65gtvac/v-deo.html
Maybe time for a new video with the Nest Power Connector? I can't seem to find much about it, but it is a pretty easy fix for my situation. The furnace has a C terminal but the house only has 2 wires to the thermostat. It hooks on at the furnace to R,W,C and then out to the original thermostat wiring and presumably makes the R wire powered all the time I suppose or however that works. Seems like a way nicer option versus a transformer and having to deal with hiding the wire.
@@OneHourSmartHome i installed it in the same exact way in this video. Works without any problem. Saved money from new wiring and installation charges. thank you
Thank you, looks simple. Now, ...my furnace circuit board does Not have a screw terminal. The 18-5 cable from the thermostat is attached with wire nuts to other wires, to a plug, and connects into the board. The C wire is wrapped up, ' Not used'. So, at what point, or where can I attach the loose C wire to ...(is the common pin/wire connection on the same plug? )
@@rgruenhaus an infinity thermostat is communicating. You would have to rewire the furnace to the conventional terminal block and use the r,c,y,ect terminals instead of the abcd plug infinity systems use
Hi.....Hi...... I have several thermostats in my house. my nest learning thermostat works great I am trying to set up a new generation of the nest thermostat (the one that requires a c wire). My old thermostat just had a W, R, green and blue wire. I have tried the blue wire for a c wire but it didn't work. I get moving the g wire to the c and then having to do the same in the furnace. but I have never done that. Being that I have four thermostats in my house, how do I know which g wire needs to be moved? thanks
I have this exact wiring to my Nest. I bought the transformer you recommended in your other video. When I attached it to C and Rh leaving the Rc wire attached) I got an error message that there was a wire inserted into C but no power. When I check the output of the transformer it reads 25.459 volts. How do I hook up the transformer with the wiring currently in place as you show it in this video????? Thank you- and I'll send you a pot of coffee!!!!!!
If you're saying your heater's control board has R and Rh jumpered, then, yes, just connect the thermostat side to EITHER Rc or Rh. According to Nest, they're internally connected/jumpered.
You are the man! Thank you so much! Your explanation was amazing! I have one question, my nest thermostat doesn’t activate the furnace above 24 degrees Celsius, 75 degrees Fahrenheit. It takes it sweet time to get there. I have a two stage 80k btu brand new keeprite furnace. All the wires are connected, or at least I think they are. An hvac guy installed everything, I didn’t do it myself. He blames the nest thermostat 3rd generation at says it’s a piece of garbage. Is it me? Is it the thermostat or is it him? I’m trying to figure this all out. Hence I’m here and subscribed to you because you explain everything so simply. Please let me know your thoughts. Thank you in advance!
What do you do if you have a common wire but it’s only putting out 16.5v ac? My friends house has a thermostat for upstairs and downstairs but it’s not two independent systems. Everything in your video matches the wiring. But no power detected because the common isn’t putting out enough voltage. Any advice you can offer would be much appreciated.
I have watched your videos many times when I first bought the Nest last winter and after adding a C wire the heater worked finally. Now that the AC is needed I’m facing issues again. The AC only comes on when I disconnect the RC wire, but then I get Error E79 and I can’t control the thermostat at all. What else can I try?!
This is actually kinda genius. Yes we don't ever use that "fan only" function on ours and i think we just have four wires. Using the green fan wire as common is the best solution, I never would have thought of that. They sell AC adapter plugs for 20 dollars if you can't change the green wire for some reason.
Hi, I have found your videos very informative hence the following question: I currently have 2 thermostats 1 for my evaporative cooler (Dial) and 1 for my heater (Honeywell), I am trying to setup a 110vac evaporative cooler w/ 2 speed motor with my 2 wire 24vdc heater on a single programable thermostat a Nest (tired of constantly fussing with 2 thermostats including recalibrating them almost weekly).I know that I need to step down the voltage to the thermostat to 24vdc from the cooler, what is the best way to go about this … I purchased a Mastercool Master Stat control box but from all I can gather the interface wires only output 3.5 vdc (only 3 wires not identified beyond Red, Black, White), and I know I will probably have to rig a "C" wire per your video, any suggestions on how to step down voltages from the cooler to interface w/ the Nest?I have tried a single stepdown transformer/relay but probably need multiple is my thought and I am assuming that I will need to connect the low to Y1 the hi to Y2 but not sure where to connect the pump O/B maybe?
i have a 2 zoned system so i started by moving the fan wire from thermostats 1 & 2 on the zoned control board to the common. I then traced those wires to the 'equipment' section of the zoned control board and moved the fan to the common. Lastly, i traced that back to the main circuit board and found the fan wire was not being used so i plugged it into 1 of the commons (the board had 2 - 1 that was going to ground and a 2nd). After i turned the breaker back on and tried to run my thermostat, i must have blown something - now the furnace and zoned control board LEDs are not working. Any tips would be greatly appreciated - hoping i didn't just create a big invoice for myself from this! Plus it happens to be very hot today.
Yes Sir, I went up to my attic and Ive been up there before and i know how HOT and tight spaces i had to crawl under and over the AC vent coils running all through my home. I get to the newly rheem ac we just installed about 3 months ago. I open the panel and behold...I did see all the alphabets and colored wires but BUT it didn't have your easy access to the common wire or green fan wire; in fact, (I should of taken a picture) but by the time i got to the panel i was already drenched in sweat) anyways, all the colored wires were all intact into this white plastic component that all the different colored wires were intact uniformed that you pulled off and onto these 5 little copper pricks. I was lost..HOLYS*&$. This 10k investment i just installed and with little electrical experience i have. I didn't even want to temp to play around with this great investment. So, I plugged everything back, screwed the panel back, getting out of dodge because i was sweating crazy and overheating....Sir, I really hoped it was as easy as you explained but i think the new technology with this plastic component that all the colored wires were inserted, then pushed into those copper pricks. I was hoping to do this C wire Hack this way because its more smarter and cleaner; however, i guess I am heading towards the 24v transformer route. Luckily just below about 4 feet below my thermostat is an electrical outlet where I can snake the wires down to the outlet and plug transformer into the outlet. Sad because I didn't want that nasty bulky transformer taking an outlet. Oh well...it is what it is...the blessing is that at least i went up into the attic and seen the challenges/obstacles before me and i can see I went up there and discovered I am not capable to play around with that situation and the transformer is my definite route. Thank You for all you help though, I still learned a lot from you...my capabilities, my options..Mele Kalikimaka and Maka Hiki Hou Dana SAID ALL THIS Sir, what my understanding all the wires are running the same current...Because the Green Wire to the Fan option is so WORTHLESS here on the islands and I have NEVER USED THE FAN EVER 20yrs in my home...COULD I JUST Put the Green onto the C Wire while the Green is still intact with the fan on the Furnace in the Attic, let me know thanks
No. A jumper from any of the other terminals to C will cause a direct short and at best blow your 24v fuse in the furnace circuit board or at worst burn your new 200 dollar nest stat.
I just installed a 3rd generation Nest. My battery says it's low. So I have 4 wires in yellow, green, red (RH), and white, but with Nest telling me my battery is low, after watching your other video, do I have to connect the C wire or am I going to find the battery will run out? In other words, is there power coming from any of the other wires to the C terminal to help charge it? I do see extra blue wire ends attached on the line on both ends (not installed), I could install it, but do I need too?
I have a Nest installed on my Furnace but Nest is not controlling my Humidistat because I only have a cable with 4 wires. I tried and couldn't replace the cable. Can I use a Venstar add-a-wire? Can you help me with the wiring diagram?
I just replaced my fan coil HVAC system in my NYC coop apartment. My contractor only ran one wire for the thermostat. I just purchased a 3rd generation Nest. How should this be connected? Does that one wire power the Nest and control the fan?
So I only have a 2 wire setup, (no AC) and no common wire. Furnace has been super finicky lately, so I'm going to try to run a new wire as I have access to the inside of the wall through the opening where a French door once was. Do I need a transformer of some kind or am I good to just run a wire from C to C?
@@jillwagner4455 so I actually didn't end up running another wire, but they do sell furnace wire at a Lowe's or a home Depot. It looks like one big wire but there's actually five smaller wires inside of it. As for my actual issue, it was the circuit board itself inside my furnace that was bad.
Greetings, I was wondering if you could help me. I had the following wires on my old thermostat: R, Rc, Y, W, G, and C. I recently bought a nest, but when I hooked up the wires, R to Rh on the new Nest 3rd Generation thermostat, W wire to W1, G to G, Y to Y1, and the common wire to common, but the nest product wouldn't power on, when it did come on it said that the common wire didn't have power, so I manuvered the wire that was in the common spot and plugged it in O/B and my heat and cooling are working. Will it be okay, or should I take it out?
Your videos are very helpful but I am still having a problem with getting the Nest to work. I have a Lennox HVAC and an Lennox iComfort WiFi thermostat. The termninals are labeled R, i+,i-, and C. There are five wires: the 4 usual ones and a light blue one. The green and the blue wires both went into the C terminal. Is the blue wire a common wire?
Nice explination i have 29.6vlts at the termostat 2nd issue my air handler has relays i didnt see a board. I called nest i was told too much volts at the termostat do i conect a common wire and how thanks
Hi. I have a boiler system. 2 wire to a Honeywell inline control valve. Colors Red and White. I have an addition wire in wall, it's an older boiler. No C wire terminal block. What else can I attach it to? Thanks
Great video! Lucky for me the C wire from the thermostat was just left unconnected to the control board. So I just connected that using wire nut the C wire which is already going to the outside AC unit.
Hello, I followed your video. Thank you. I’ve had my nest running for a week and then it stopped. Issue with Rh power not giving enough juice. Changed out my transmitter, worked great, then same thing happened after like 10 days. Not sure what else to do. I have the G and the C wire. Would it be smart to connect the W1 and Rc wires together?
Get a C Wire Adapter, it is a thin white wire, drill hole all the way through the wall where the wires come out behind the thermostat (that is if you have a room there? and nothing is in the way?), push the wire through the wall with a coat hanger etc., now all you do is plug in the adapter (in the other room) and you will never have a problem again, you have to buy a 8-10" long drill bit and say 1/4" wide or so? It is easy.
Hi. We are building our home with foam insulation total encapsulation, needing fresh air ventilation. Would you happen to know why our HVAC installer would have to add a different module for the Nest thermostat vs. the Honeywell T6? We want the Nest thermostat, but they usually use the Honeywell, which is said to be set up for what they are installing. Thank for any insight.
Because most distributors give away honeywell thermostats for free with the furnace and many HVAC companies have no desire to make accomodations. 95% of furnace systems work with nest without issue. There are a small number of very high efficency HVAC systems that use variable fan speed control, paired with precise variable heating and cooling these systems can't use a nest but they are few and far between.
Hi, fantastic tutorial. In Canada and it's getting cold. I have one black wire that I have no idea where it goes. I have a forced air gas furnace with air conditioning. (Five wires in total) This is where the wires go at the moment on the old Honeywell thermostat: Black: R White: W Orange: Y Green: G Red : Rc Where does the black wire go on the Nest thermostat?
Might just be an extra wire not connected in the furnace system I would remove the dust cover and check to see what wires are connected where on the furnace terminal block and mirror that on the nest.
Thanks so much for getting back to me. If I place the free wire in the free holes (trial and error), could this damage the thermostat? @@OneHourSmartHome
I've been trying to figure out how to fix the COOL setting on my Nest Learning Thermostat (Gen 3.) I don't have a yellow wire, but I do have a black wire. I also have a white wire, a green wire, and a red wire. Can the black wire be used in place of the yellow wire? Been trying different combinations all day. No luck. Seems like I need the Green wire as a fan wire since it doesn't auto turn on the fan when changing temperatures. The house heats no problem but the AC unit turns on and doesn't pump very cool air. The temperature seems to stay at the same temp with and without the COOL setting on. My current set-up is Black wire into Y, White wire into W, Green wire in G and Red wire into Rh. (I've also tried the same setup with Red wire into Rc instead)
In most cases the colors don't technically matter, they just help keep things standardized and consistent. So long as the end of each wire goes to its mate.
I have a dual zone setup. My fan is set to constantly circulate air at a low speed but is controlled by the downstairs Nest Thermostat. I want to replace my upstairs thermostat with a Nest so can I still use the G wire solution and not affect the fan?
I have a Honeywell HZ311 panel and my home has 1 unit with 3 zones. Installing 3 Nests to replace old Trane thermostats. I followed your instructions and I ended up blowing my 5 amp fuse on the furnace board. I then realized when I opened the HZ311 panel that they are wired from the thermostats, which is then wired to the furnace board. So, I think I need to move the green G wire to the C terminal for all 3 zones inside the HZ311 panel - but then do I need to do it on the furnace board as well? Or leave that as is?
The Honeywell panel: amzn.to/2GRhVp3 is most likely powered separately by a transformer when it was originally installed so you don't need to make the adjustment in the furnace wiring at the furnace control board. You can just change the wiring from the thermostat to the honeywell panel. Leave the wiring as is from the honeywell panel to the furnace board. What happened when the fuse blew is you were most likely sending extra power from the powered control board to the furnace which already has it's own power source and overloaded the fuse.
No, that won't work. You can either do this: ua-cam.com/video/gahPxCcPDto/v-deo.html with a common wire adapter: amzn.to/2UEerxs or you can change over using this method: ua-cam.com/video/w0BZPx8-Q5o/v-deo.html
I cannot thank you enough for your video on using the green fan wire plugged into the c slot to power the thermostat. I would have never thought of that in a million years. My nest was a mess. No decent power supply. The adjustment I made based on your video was done minutes before the ac tech was due to arrive for my summer ac check up. Had I not done this work around the tech would not have been able to due the check up. The standard visit for a check up is 60 dollars. The charge for diagnosis of a problem is 90 dollars. Your advise saved me 90 dollars!! Thank you so very much. Dan Las Vegas.
Simple and to the point! I spent hours asking folks at Home Depot, etc, and searched the web reading about its possible to use the green wire as C wire but was confusing, wasn't sure if I need to bridge green with C or how to do it. This answered all my questions as a noob and save some serious $$ booking an HVAC "specialist" for a home visit/ thermostat install. Thank you!
Amazing!!! After watching this video I was able to switch the 2 wires in a couple of minutes. It was exactly as described. I am a visual learner and the white board you used was perfect. The symptom of my Nest was it would turn on and turn off right away over and over. This fixed that. Tks so much!!!
This tip worked for me!!!! Last night was the first night I really needed heat in the house since I installed my Nest. I was freaking out because we were cold this morning and the Nest kept saying delayed for 2:30 and the furnace wouldn't stay on for more than 60 seconds. Now... the house is getting warm with the furnace running until the room hits temperature. A most sincere thank you to you from me, my wife, my children, and my pets. We won't freeze again tonight.
That's sounds awful. Why would Nest make a system that isn't transferable from existing systems with the same electronics? Is the C wire for wifi/app control?
I did exactly as you said. When I turned on the circuit breaker, seen the new wiring update on my nest. I tried the heat, check it’s working and air is coming out of registers. When I tried the central air conditioning, the a/c came on but not the blower! I turned off the circuit breakers, rechecked my work, everything looked good, turned on again with the same results, no blower for a/c. Do I need to check anything on the a/c compressor? Any suggestions would be welcomed!!
This is a great solution for those who have only four wires running from the thermostat to the furnace/blower unit; however, it's been my experience that most electricians will use a cable with six or seven wires and just not use them all. The easiest solution is that, if you have this situation, connect the black (common) wire to the Nest, and go to the furnace/blower, and connect the black wire to the common terminal. Another solution (if you don't want to sacrifice the functionality of turning on and off the fan from the Nest) is to use your old (4-wire) thermostat cable to pull a new 6-wire thermostat cable. Securely loop individual wires form the old cable to the new one and then tape over the connect so you have a smooth surface to pass over any tight spots along the root. Go to the attic/basement/furnace closet and use the old wire to pull the new one through the wall/floor/ceiling, etc. and connect it as diagramed here.
Nice solution, sir! Might you be a fellow IT tech who has fished a few Ethernet wires in his day?
I watched 20 videos before this one. This video answered everything in a short time.
Great explanation! Was so confused with the "cooling delayed for x amount of time." This was quick, easy and it worked!😁
Thank you. I have had my Nest set up for years, but never had cooling working. Heating has been fine. I watched 2 minutes. Went to my Nest, made the changes, and we have cooling. Thank you..... My family thanks you too....
Great to hear!
Finally a fix for my Nest to keep the A/C from short-cycling. Thank you.
Thank you for saving me money. As a bonus, my upstairs is no longer a few degrees warmer than the surface of the sun.
Lol, thanks for watching!
1 steaged 2nd steaged Y,iY2 c common g 24 vpk
W,1w2 heatar
Thanks so much for the clarity and such an easy fix. Took me less than 5 minutes to complete. PERFECT!!!!
I was ready to break some walls, you’re a life saver.
Lmao.. same here
You saved me from a headache lol very well explained. Thanks bud
Thank you so much for this video it helped me set up my new smart thermostat without a c wire.
Watched this and had to figure out that the previous owner had swapped the brown wire so we're all set. Thanks for the info, we've got our Nest back!
Glad it helped
Really helpful. I wouldn't have considered doing this unless it was this easy. It made sense and seems to have worked. Thanks!
Glad it helped!
I bought the 24 v transformer/common wire after seeing one of your other videos additionally to talking with my Hvac guy
Glad we could help, this is the transformer:ua-cam.com/video/gahPxCcPDto/v-deo.html and the other video: ua-cam.com/video/gahPxCcPDto/v-deo.html
Thaaaaaaank youuuuu!! Going to try this in the am. Video is sooo simple to follow! I’m Living on space heaters in Winnipeg atm brrr 🥶 ❄️ 🧊 ⛄️
Makes perfect sense - now to find out how to get into my damn furnace! I went up in the attic and I couldn't find the control board to save my life...all while baking in the heat. LOL
I like your videos, they are very clear. I have a question, my air handler has two wires on the C terminal but my Nest thermostats C terminal doesn't have a wire on it, can I put a third wire on the C terminal on my air handler and run it to the C terminal on my Nest thermostat?
Thanks for the easy fix and simple explanation!
Hi. I have a blue wire not used at the thermostat hole but not used on my existing thermostat, can i just make sure its connected to "c" at the furnace or if not, just connect it at the furnace to "c"?
Hi, Franklin, my situation is the same as yours. What did you end up doing? Thank you.
@@jsordaz i chased it to the furnace, there was no circuit board as it was just hard wired into the other wires. I found that it was connected to the condenser circuit and furnace power so it was live. So i just connected it to my thermostat and it worked.
@@FranklinDBluth-yq6ww, thank you. I have a Common wire terminal in my thermostat relay and on my boiler circuit board. I am going to try to connect the unused blue wire (in the wall) to the COM terminal in the thermostat relay. Theoretically it should work to power the Nest Thermostat E.
Thanks... all other videos didn’t address only 1 Red wire connection location. 👍🏼
Very nice presentation. 👍
Some suggest to put a jumper wire between Y & G terminals at furnace side. What do you think about the jumper?
Thanks for this video and advice!
i also have a orange wire... does it go in the OB slot? i have yellow (y1), green(g), orange(ob), white(w1), blue(c), and red(rh).... do i need to swap my rh to rc?
I also have an orange wire. Any solutions here?
@@honeymu5tard302 my setup was… y1- yellow G- green OB-orange Rh-red C-blue w1- white
great information but looking at some other video and some are saying to use a jumper to Y and G on the control board @ the Furnace any help on that ...
It worked!! Took just a few minutes to figure it out after watching your video. Thanks for making this video it was very helpful.
This helped so much thanks!!!
Thank you for your helpful video with an excellent description of what to look for and how to fix the common wire problem. I was able to pull a new thermostat wire from my unit in the basement up to the thermostat and using the wiring diagram figure out the common wire and add power to my Nest thermostat. It had worked for about 2 years but with the heating system and Hot water heat, not running the fan, my battery was low on voltage. Fixed for the cost of a new wire.
Sir, I have been looking at your video/issues regarding no C wire and like many, I purchased a Nest Thermostat. This issue is very prevalent on Oahu, these track homes dont usually have the C-Wire for a thermostat, to be fair because in the past we didnt need a C wire for these 20th century mercury-type thermostats, now we do...
Just about about 3 months ago we finally installed after 20 years, we replaced our Rheem Central Air Unit up in the attic and the fan module in the back yard. Typically these track homes here, the builders here always put the "minimal" units to these new track homes. Anyway, we have this,"Haus-beast mode Ac Unit" now and it sounds like a jet starting up with all the cool air blowing through our large home, even to our farthest rooms in the home downstairs...nice...Sir, but again we didnt have a C-wire so the new installers weren't able to hook up my Nest Thermostat and just put our old battery thermostat for now.
I really was considering your other incredible video with the plug-in transformer but to me sir, having a transformer is just so ghetto(for me) I can do what you illustrate on your other transformer video because it is so simple since I have an outlet just below the thermostat area upstairs but again to me, it just doesn't look good and it takes an outlet socket away from our daily chores and what not.......BUT Honestly Sir....I know i can do this...I just need to go up into the attic and switch out the fan wire(because frankly, for over 20 years NEVER i have used our fan option, no one has on Oahu...) and reroute it onto the C-wire on main unit in the attic and Nest....Im am a UA-camr advocate repair guy, i too also have some How To Videos to help out. Wish me luck...ill be turning off all the voltage when i make this upgrade..Mahalo...ill let you know...your video looks so painfully easy...Just follow the yellow brick road....Mahalo Again Dana
Hi,
Thank you for the info, I live in a hot climate city so I don't really need the heat function...
Is it ok to use this solution on the W wire rather than the fan ?
Thank you in advance..
you can use it on any wire just know that whatever wire you move to the C terminal you will lose that functionality, all wires are the same its just a matter of what terminal its connected to dont let the colors intimidate you. Hope this helps!
This use of the fan wire is solid "More than one way to skin a 🐈" type information.
I have a Nest E thermostat but only 2 wires coming in so no power, am thinking of adding and external transformer but the transformer has 2 wires . One will go into the C terminal, but where does the other wire go, the Nest E has no other R labeled slots?
Do I just cap the wire?
Great presentation.
Thanks for any help.
Great instruction James! Keep it up.
Thank You!
Very informative. Question what happen if you have a blue wire instead of yellow??, I used the blue as a yellow it work until today it gave me a message saying e75 ??
This was the fix I needed.
Great video and instructions
Excellent idea. However I don’t have a C terminal on my HVAC 2 stage Trane. Connected I have a W3, W2, W1, G, Y2, Y1, R, B, Yo. Open I have BK and O. Can I use my green cable connected to the G terminal to either the BK or O terminals to my WiFi C terminal? I have to add a C wire for my two stage ac to work properly. A million thanks in advance!!!
Works great! Exactly what I needed.
Thank you! This fixed my problem! I installed a nest e thermostat late last spring. When in cooling mode, my draft inducer fan (for heating) was turning off and on continuously when the air conditioner was running. After what you said about sometimes using the "common" wire, it turns out that I had to connect the blue wire to the "C" terminal and also to the "C" terminal on the furnace circuit board. My old t-stat did not use this wire. The nest e directions did not require me to do this. It solved my issue, no more draft inducer fan running during the cooling mode. THANKS!
Awesome! Thanks for sharing the comment as this can help other people with the same issue. Thanks for subscribing.
I think I’m in the same boat. My 5th wire is blue and unused at the thermostat and at the furnace. I’m planning to use it as a common. There are already two white wires connected to the common screw at the furnace (probably to the AC and to the humidifier like you said). Sounds like it is okay hook up a third wire (blue) to the common screw. Sound right?
Excellent video, thanks so much
I have the thermostat installed into my AC unit. The heat is separate. The heat has a control unit that has all the terminals nicely labeled. But the AC unit doesn’t have a control box like that. Everything is wired directly to the relays and transformers. Any suggestion on where I could install the C/Common (ground) wire too?
Hey man, live the videos. I have a current Trane comfortlink thermostat with three wires, D,R,B. Do you think it’ll be compatible with a nest? There are extra wires that I could use for common.
Only two wires on a hot water boiler, can I use the new Nest thermostat without any modifications? I have the gen 3 in the house but bought a basic Thermostat today at HD and now concerned that it won’t work without another power wire? Mine are W and Rh
Each time you mentioned the C wire and G connection it was helpful, but as you mentioned earlier a heat pump might be different so you might have wanted to say something added about the fan not being needed because the furnace turns on the fan "Except" when you have a heat pump and the fan is turned on without the furnace or compressor to circulate air when minor changes in temp are only needed which saves money!
Robert thanks for the insightful comment. We're adding a video on heat pumps also.
Very good. Just one thing. Several other sites explain this workaround too. They also note to put a jumper wire between Y and G on the Furnace Control Panel. I see you did not though. Can you clarify if you need to do this or not?
You shouldn't need a jumper on the Y and G terminal.
@@OneHourSmartHome No disrespect intended. Here are two different sites that say you do need to. So just asking again or can you explain why no need please?
malekservice.com/need-c-wire-thermostat/
m.ua-cam.com/video/nki-65gtvac/v-deo.html
Maybe time for a new video with the Nest Power Connector? I can't seem to find much about it, but it is a pretty easy fix for my situation. The furnace has a C terminal but the house only has 2 wires to the thermostat. It hooks on at the furnace to R,W,C and then out to the original thermostat wiring and presumably makes the R wire powered all the time I suppose or however that works. Seems like a way nicer option versus a transformer and having to deal with hiding the wire.
I’m going to install Nest Thermostat E today following this video. Hope all goes good. I’ll comment after installation.
Good to know, glad we could help.
@@OneHourSmartHome i installed it in the same exact way in this video. Works without any problem. Saved money from new wiring and installation charges. thank you
@@anandcosta Thanks for the update and happy to hear it worked for you!
Great presentation! Is their any opportunity to connect two various devices, like conditioner and boiler to one Thermostat?
Thank you, looks simple. Now, ...my furnace circuit board does Not have a screw terminal. The 18-5 cable from the thermostat is attached with wire nuts to other wires, to a plug, and connects into the board. The C wire is wrapped up, ' Not used'. So, at what point, or where can I attach the loose C wire to ...(is the common pin/wire connection on the same plug? )
What if I have a hvac from 1980. Since the C wire need 24v is there another place I can tap into?
Wow this is brilliant. We started using the air for the first time with the nest and have had problems so I’ll have to try this.
Glad to hear it helped! Thanks for the comment.
I am going to be replacing an infinity thermostat from 2007 to a wifi thermostat. Do you know if the infinity thermostat uses a C wire?
@@rgruenhaus an infinity thermostat is communicating. You would have to rewire the furnace to the conventional terminal block and use the r,c,y,ect terminals instead of the abcd plug infinity systems use
You're a great teacher
Hi.....Hi...... I have several thermostats in my house. my nest learning thermostat works great I am trying to set up a new generation of the nest thermostat (the one that requires a c wire). My old thermostat just had a W, R, green and blue wire. I have tried the blue wire for a c wire but it didn't work. I get moving the g wire to the c and then having to do the same in the furnace. but I have never done that. Being that I have four thermostats in my house, how do I know which g wire needs to be moved? thanks
I have this exact wiring to my Nest. I bought the transformer you recommended in your other video. When I attached it to C and Rh leaving the Rc wire attached) I got an error message that there was a wire inserted into C but no power. When I check the output of the transformer it reads 25.459 volts. How do I hook up the transformer with the wiring currently in place as you show it in this video????? Thank you- and I'll send you a pot of coffee!!!!!!
Hey love the videos. I have r and its jumper to rh. Do I not use the jumper and just connect the r to rc on the Nest? Thank you
If you're saying your heater's control board has R and Rh jumpered, then, yes, just connect the thermostat side to EITHER Rc or Rh. According to Nest, they're internally connected/jumpered.
Worked like a champ! Thanks!!
Excellent excellent explanation.
Thanks this was alto off help I had 5 wire so I just added it from the furnace to the c terminal
You are the man! Thank you so much! Your explanation was amazing! I have one question, my nest thermostat doesn’t activate the furnace above 24 degrees Celsius, 75 degrees Fahrenheit. It takes it sweet time to get there. I have a two stage 80k btu brand new keeprite furnace. All the wires are connected, or at least I think they are. An hvac guy installed everything, I didn’t do it myself. He blames the nest thermostat 3rd generation at says it’s a piece of garbage. Is it me? Is it the thermostat or is it him? I’m trying to figure this all out. Hence I’m here and subscribed to you because you explain everything so simply. Please let me know your thoughts. Thank you in advance!
hi good video but i have 5 wires Rh,Rc,W,Y,G, how can i stup the C wire in the nest thank
What do you do if you have a common wire but it’s only putting out 16.5v ac? My friends house has a thermostat for upstairs and downstairs but it’s not two independent systems. Everything in your video matches the wiring. But no power detected because the common isn’t putting out enough voltage. Any advice you can offer would be much appreciated.
I have watched your videos many times when I first bought the Nest last winter and after adding a C wire the heater worked finally. Now that the AC is needed I’m facing issues again. The AC only comes on when I disconnect the RC wire, but then I get Error E79 and I can’t control the thermostat at all. What else can I try?!
This is actually kinda genius. Yes we don't ever use that "fan only" function on ours and i think we just have four wires. Using the green fan wire as common is the best solution, I never would have thought of that. They sell AC adapter plugs for 20 dollars if you can't change the green wire for some reason.
Hi, I have found your videos very informative hence the following question: I currently have 2 thermostats 1 for my evaporative cooler (Dial) and 1 for my heater (Honeywell), I am trying to setup a 110vac evaporative cooler w/ 2 speed motor with my 2 wire 24vdc heater on a single programable thermostat a Nest (tired of constantly fussing with 2 thermostats including recalibrating them almost weekly).I know that I need to step down the voltage to the thermostat to 24vdc from the cooler, what is the best way to go about this … I purchased a Mastercool Master Stat control box but from all I can gather the interface wires only output 3.5 vdc (only 3 wires not identified beyond Red, Black, White), and I know I will probably have to rig a "C" wire per your video, any suggestions on how to step down voltages from the cooler to interface w/ the Nest?I have tried a single stepdown transformer/relay but probably need multiple is my thought and I am assuming that I will need to connect the low to Y1 the hi to Y2 but not sure where to connect the pump O/B maybe?
Very good tip!! I was trying to figure out what I was going to do, now I know!
Glad I could help.
i have a 2 zoned system so i started by moving the fan wire from thermostats 1 & 2 on the zoned control board to the common. I then traced those wires to the 'equipment' section of the zoned control board and moved the fan to the common. Lastly, i traced that back to the main circuit board and found the fan wire was not being used so i plugged it into 1 of the commons (the board had 2 - 1 that was going to ground and a 2nd). After i turned the breaker back on and tried to run my thermostat, i must have blown something - now the furnace and zoned control board LEDs are not working. Any tips would be greatly appreciated - hoping i didn't just create a big invoice for myself from this! Plus it happens to be very hot today.
Yes Sir, I went up to my attic and Ive been up there before and i know how HOT and tight spaces i had to crawl under and over the AC vent coils running all through my home. I get to the newly rheem ac we just installed about 3 months ago. I open the panel and behold...I did see all the alphabets and colored wires but BUT it didn't have your easy access to the common wire or green fan wire; in fact, (I should of taken a picture) but by the time i got to the panel i was already drenched in sweat) anyways, all the colored wires were all intact into this white plastic component that all the different colored wires were intact uniformed that you pulled off and onto these 5 little copper pricks. I was lost..HOLYS*&$. This 10k investment i just installed and with little electrical experience i have. I didn't even want to temp to play around with this great investment. So, I plugged everything back, screwed the panel back, getting out of dodge because i was sweating crazy and overheating....Sir, I really hoped it was as easy as you explained but i think the new technology with this plastic component that all the colored wires were inserted, then pushed into those copper pricks. I was hoping to do this C wire Hack this way because its more smarter and cleaner; however, i guess I am heading towards the 24v transformer route. Luckily just below about 4 feet below my thermostat is an electrical outlet where I can snake the wires down to the outlet and plug transformer into the outlet. Sad because I didn't want that nasty bulky transformer taking an outlet. Oh well...it is what it is...the blessing is that at least i went up into the attic and seen the challenges/obstacles before me and i can see I went up there and discovered I am not capable to play around with that situation and the transformer is my definite route. Thank You for all you help though, I still learned a lot from you...my capabilities, my options..Mele Kalikimaka and Maka Hiki Hou Dana
SAID ALL THIS Sir, what my understanding all the wires are running the same current...Because the Green Wire to the Fan option is so WORTHLESS here on the islands and I have NEVER USED THE FAN EVER 20yrs in my home...COULD I JUST Put the Green onto the C Wire while the Green is still intact with the fan on the Furnace in the Attic, let me know thanks
No. If you get any feedback voltage from the board to G it will send it back to the stat and burn the stat board.
Great job, thanks bra!
I don't have cooling, can I just use the y wire for this if it's already there?
Brilliant and simple. Thank you :)
Can you put a jumper between G and C (if there are other wire on C already)?
No. A jumper from any of the other terminals to C will cause a direct short and at best blow your 24v fuse in the furnace circuit board or at worst burn your new 200 dollar nest stat.
No, you cant jumper. The c wire goes in one terminal for providing power and the g wire is fan control.
@@OneHourSmartHome thank you
I just installed a 3rd generation Nest. My battery says it's low. So I have 4 wires in yellow, green, red (RH), and white, but with Nest telling me my battery is low, after watching your other video, do I have to connect the C wire or am I going to find the battery will run out? In other words, is there power coming from any of the other wires to the C terminal to help charge it? I do see extra blue wire ends attached on the line on both ends (not installed), I could install it, but do I need too?
I have a Nest installed on my Furnace but Nest is not controlling my Humidistat because I only have a cable with 4 wires. I tried and couldn't replace the cable.
Can I use a Venstar add-a-wire? Can you help me with the wiring diagram?
I just replaced my fan coil HVAC system in my NYC coop apartment. My contractor only ran one wire for the thermostat. I just purchased a 3rd generation Nest. How should this be connected? Does that one wire power the Nest and control the fan?
No thermostat uses only one wire. Look at it again.
So I only have a 2 wire setup, (no AC) and no common wire. Furnace has been super finicky lately, so I'm going to try to run a new wire as I have access to the inside of the wall through the opening where a French door once was. Do I need a transformer of some kind or am I good to just run a wire from C to C?
I have this same issue. Were you able to run wire from C to C? And what kind of wire do I buy???
@@jillwagner4455 so I actually didn't end up running another wire, but they do sell furnace wire at a Lowe's or a home Depot. It looks like one big wire but there's actually five smaller wires inside of it. As for my actual issue, it was the circuit board itself inside my furnace that was bad.
Greetings,
I was wondering if you could help me. I had the following wires on my old thermostat: R, Rc, Y, W, G, and C. I recently bought a nest, but when I hooked up the wires, R to Rh on the new Nest 3rd Generation thermostat, W wire to W1, G to G, Y to Y1, and the common wire to common, but the nest product wouldn't power on, when it did come on it said that the common wire didn't have power, so I manuvered the wire that was in the common spot and plugged it in O/B and my heat and cooling are working. Will it be okay, or should I take it out?
Good explanation and clear. Keep it up!
Thanks!
HELP - I have an HRV, can I run a common wire to the star terminal similar to your video on humidifiers? thanks
Your videos are very helpful but I am still having a problem with getting the Nest to work. I have a Lennox HVAC and an Lennox iComfort WiFi thermostat. The termninals are labeled R, i+,i-, and C. There are five wires: the 4 usual ones and a light blue one. The green and the blue wires both went into the C terminal. Is the blue wire a common wire?
🙏I was about to return my thermostat. Make sure to get some tech money from google😀
Nice explination i have 29.6vlts at the termostat 2nd issue my air handler has relays i didnt see a board. I called nest i was told too much volts at the termostat do i conect a common wire and how thanks
Enjoyed your video but can you not add a jumper wire between the G and C terminals on the Nest and achieve the same result?
No, not the same result. The c wire is wired to a c terminal on the HVAC terminal block inside your HVAC unit.
That is a direct short and will blow a fuse or destroy the circuit board.
Hi. I have a boiler system. 2 wire to a Honeywell inline control valve. Colors Red and White. I have an addition wire in wall, it's an older boiler. No C wire terminal block. What else can I attach it to? Thanks
thnks for the info. have problem my furnace board don'g have a c connector what can do
Glad to help!
Great video! Lucky for me the C wire from the thermostat was just left unconnected to the control board. So I just connected that using wire nut the C wire which is already going to the outside AC unit.
Glad it helped!
Have a Nest thermostat E . Purchased a 24V DC common wire.
But i dont get where i hook up my wires to existing RGYW ? please help
Hello, I followed your video. Thank you. I’ve had my nest running for a week and then it stopped. Issue with Rh power not giving enough juice. Changed out my transmitter, worked great, then same thing happened after like 10 days. Not sure what else to do. I have the G and the C wire. Would it be smart to connect the W1 and Rc wires together?
Get a C Wire Adapter, it is a thin white wire, drill hole all the way through the wall where the wires come out behind the thermostat (that is if you have a room there? and nothing is in the way?), push the wire through the wall with a coat hanger etc., now all you do is plug in the adapter (in the other room) and you will never have a problem again, you have to buy a 8-10" long drill bit and say 1/4" wide or so? It is easy.
Any idea on how to connect / workaround and setup nest thermostat with a 240v system ?
Hi. We are building our home with foam insulation total encapsulation, needing fresh air ventilation. Would you happen to know why our HVAC installer would have to add a different module for the Nest thermostat vs. the Honeywell T6? We want the Nest thermostat, but they usually use the Honeywell, which is said to be set up for what they are installing. Thank for any insight.
Because most distributors give away honeywell thermostats for free with the furnace and many HVAC companies have no desire to make accomodations. 95% of furnace systems work with nest without issue. There are a small number of very high efficency HVAC systems that use variable fan speed control, paired with precise variable heating and cooling these systems can't use a nest but they are few and far between.
@@OneHourSmartHome thank you!
Thank you! Nice and clear explanation. Much appreciated.
Glad we could help!
Hi, fantastic tutorial. In Canada and it's getting cold. I have one black wire that I have no idea where it goes. I have a forced air gas furnace with air conditioning. (Five wires in total) This is where the wires go at the moment on the old Honeywell thermostat:
Black: R
White: W
Orange: Y
Green: G
Red : Rc
Where does the black wire go on the Nest thermostat?
Might just be an extra wire not connected in the furnace system I would remove the dust cover and check to see what wires are connected where on the furnace terminal block and mirror that on the nest.
Thanks so much for getting back to me. If I place the free wire in the free holes (trial and error), could this damage the thermostat? @@OneHourSmartHome
I've been trying to figure out how to fix the COOL setting on my Nest Learning Thermostat (Gen 3.) I don't have a yellow wire, but I do have a black wire. I also have a white wire, a green wire, and a red wire. Can the black wire be used in place of the yellow wire?
Been trying different combinations all day. No luck. Seems like I need the Green wire as a fan wire since it doesn't auto turn on the fan when changing temperatures.
The house heats no problem but the AC unit turns on and doesn't pump very cool air. The temperature seems to stay at the same temp with and without the COOL setting on.
My current set-up is Black wire into Y, White wire into W, Green wire in G and Red wire into Rh. (I've also tried the same setup with Red wire into Rc instead)
In most cases the colors don't technically matter, they just help keep things standardized and consistent. So long as the end of each wire goes to its mate.
Hello,is it applicable to a zoning also? I tried to wire it like you do but it look like it’s not working on zoning.Hope for your kind response.Thanks
What if I have two power supplies (one from air handler and one from boiler )?
I have a dual zone setup. My fan is set to constantly circulate air at a low speed but is controlled by the downstairs Nest Thermostat. I want to replace my upstairs thermostat with a Nest so can I still use the G wire solution and not affect the fan?
I have a Honeywell HZ311 panel and my home has 1 unit with 3 zones. Installing 3 Nests to replace old Trane thermostats. I followed your instructions and I ended up blowing my 5 amp fuse on the furnace board. I then realized when I opened the HZ311 panel that they are wired from the thermostats, which is then wired to the furnace board. So, I think I need to move the green G wire to the C terminal for all 3 zones inside the HZ311 panel - but then do I need to do it on the furnace board as well? Or leave that as is?
The Honeywell panel: amzn.to/2GRhVp3 is most likely powered separately by a transformer when it was originally installed so you don't need to make the adjustment in the furnace wiring at the furnace control board.
You can just change the wiring from the thermostat to the honeywell panel. Leave the wiring as is from the honeywell panel to the furnace board. What happened when the fuse blew is you were most likely sending extra power from the powered control board to the furnace which already has it's own power source and overloaded the fuse.
@@OneHourSmartHome Just seeing this - thank you for your response.
Thank you for your information.. I have a question- its possible just do a jumper wire in thermostat from G to C?
No, that won't work. You can either do this: ua-cam.com/video/gahPxCcPDto/v-deo.html with a common wire adapter: amzn.to/2UEerxs or you can change over using this method: ua-cam.com/video/w0BZPx8-Q5o/v-deo.html
What will tell the fan to turn on if you have no g wire.? Should I run a jumper between w and g to make sure fan turn on when it calls for heat???
Great video, very helpful!!!!!! Right to the point!!
Glad we could help! Thanks for the comment.