Following your checklist, I was able to eliminate all possibilities except #6 - failed control board. Sure enough, when I pulled the board out and inspected it closely, one of its tiny components had been deep-fried. Thirty minutes later after a trip to a local supply house, the blower was running normally again. Fixing problems like this can be simple; identifying what needs fixing is where expertise like yours is so valuable. Many, many thanks for sharing!
After too many hours of youtube to admit, I still haven't solved my problem. But this is by far the most informative video I've seen, thank you very much!
Passed my EPA 608 Cert. and moved into our HVAC group. Just bought your book and appreciate your detailed descriptions. It’s good to a newbie like me. Cheers!
Why would anyone give this video a thumbs down? You couldn’t find a better video explaining what could be wrong with your blower. People hate for no reason other than to be ignorant.
SIR - You are God Send Help. THANK YOU A MILLION AND I WILL NEVER FORGET YOU. My situation was the Inside Air Handler or Evaporator Blower motor wouldn't turn on, while the outside compressor condensing unit will turn on. I was afraid that the air handler motor /Capacitor / relay would be the culprit and perhaps even the controller board. I have changed the motor / cap and relay on the condensing unit but never messed with the Air Handler Blower or the inside unit and was dreading it. Your Video saved me from no telling what kind of an expensive ride I would have had with those AC repair service surprises. Mine is a 35 year old Goodman unit and probably doesn't have the ECM etc since it is a single speed motor. I watched your video in full and was going to go step by step. I followed Step 7 (the thermostat) first since it was easy and never knew thermostat could cause an issue while allowing the condensing unit to come on. I removed the Battery, measured the voltage was reading 1.334 and was hoping a new BATT would help. Guess what i put a new battery and the Fan handler came on and the AC is working now. Never realized that thermostat showing to be in working shape could cause this. May God Bless you for your Great Service and Once again a Big Thanks to you and you are TRULY GOD SEND HELP. One question sir - Is it normal for the condensing unit to come on first and the Air handler fan to turn on after a 25 second delay. I dont think it was like this before. Is this some symptom of some thing coming... Thank You.
Very very helpful (understatement of the year) . You helped me narrow down what was going on with my blower motor. It was a bad thermistor in my ECM. You easily saved me a grand or 2!
Wow. You present the material so well. Very concise, and to the point. And it is great to see what an experienced person does in this situation. Thank you !
You got my attention at 8:50 with your yellow magnetic jumper wire. Never seen these anywhere before and I see Amazon has them. I troubleshoot a lot of industrial machinery and with most of the terminal strips there is no way to attach a meter lead and a person only has two hands. I was going to make some of these leads and bought and received some small neodymium magnets. Another thing is why a person should use a bleeder resistor instead of a screwdriver to discharge a capacitor is because some capacitors have an internal fuse and if you use a screwdriver you run the chance of blowing the fuse besides blowing the tip off of your screwdriver. Great job.
A note on the thermostat face: after I changed my batteries, I still had to jump one of the connections before the face could become functional again. I also tested my cap, it was on the lower end of its capacitance rating, but I wonder if draining it and putting it back did something as well… one of my EE coworkers recommended I try that specifically. Anyway, thanks for the awesome video!!
Thank you so much for your wonderful tutorial, excellent information. Was able to easily fix the problem. Dead batteries, and a fan that had been turned to automatic. God bless you. Saved a visit from HVAC for something so simple.
Thanks. By testing my blower motor resistance and not seeing/smelling any indication of burning, and noticing the motor turned freely I purchased a new control board and that fixed the problem!
@@Superschemer34 It was the "Fixed Speed Furnace Control Replacement Module" as listed on the box. Mine was made by ICM Controls. Model ICM282A if you want a reference
Whew! It was the thermostat batteries. This just happened tonight. I heard the burner ignite and the gas flow but noticed the fan didn’t start a few minutes later like it normally does. I turned off the heat and turned on the fan and nothing. I’m thinking the fan motor is shot or maybe the capacitor. Did a quick YT search and found your video. I never would have thought of the thermostat batteries. The display did not show the BATT indicator. I replaced the batteries and the fan is working. Thank you.
Very helpful video, than you! The blower fan stopped working , meaning NO ac in the house, I opened the panel and disconnected blue cable which is the medium speed, and connected the black high speed and blower working again. Do you think that the issue is in the motor? Will appreciate your feed back.
your channel pretty much put me in the position to almost fully diagnose what has gone awry with my 3.5ton carrier heatpump package. sadly i have not isolated the problem as of yet. the original problem: indoor fan blower moves freely with no noise and is seated properly but motor movesonly in a stop go fashion (small movements). compressor comes on, bottom of accumulator and some of the lines frost over (ambient outdoor temp is 107 between Noon and 1700 )since it is an older 42 size system i felt it prudent to start replacing the usual culprits: capacitor. hard start kit. defrost board. single pole contactor. replaced blower motor. thermostat good.result: same issue. outdoor fan is fine. condensator coils and ubends look good, unit very clean. wiring clean. no obvious oil deposits anywhere on copper lines, valves, connections. what's next? replace fan board? refrigerant charge/leak?
Thank you for making this video. It was extremely helpful in diagnosing what was going on with our HVAC and helped me to save a lot of money on a costly big repair.
Perfect video thanks! I was told yesterday that my blower motor AND module were bad on an ECM motor. After watching this though I'm not thinking that's the case. Gonna check it out myself now.
Thank you sir, going crazy, bought contactor, new board, capacitor, just to find out now, it's the thermostat. Never thought it would be that, but if it wasn't for this video, probably would have called a hvac company. Thanks again. 👍Great video..
Thank you for this video. I was close to having to pay for a tech to come out and tell me that my thermostat plate was bad. I have a new one on the way!
Great and informative video. Been working for hours trying to figure out what is wrong with my HVAC. Hopeful the things I try in this video will work. Will report back soon.
@@rcm-tr1be Turns out, it wasn't my blower the whole time! Who would've thought. My circuit board was sending power to everything EXCEPT the blower, so I had to splice my line in 120V temporarily until I get a new board. Crazy right?
Thank you! I carefully followed your process and was able to quickly identify and solve the problem. Turned out to be a bad thermostat face. When I swapped with another thermostat from a 2nd zone the unit immediately worked! But Ironically the problem unit is working in the 2nd zone! How do you explain that?
Thanks for sharing this info. I replaced my blower motor several years ago and it has worked fine until this year. If I put it on fan on constant and it starts it will run for ever until I turn it off. If I leave it on automatic it may or may not start when the compressor runs. I'll check these points you have shown us. I only work on this stuff every few years and I have put this off for months just letting the fan run constantly and wasting a lot of power. Getting too old to crawl around in the attic have had four knee surgeries in the last two years so I have plenty of excuses. LOL!
I blew up a screen shot to view the code number you read description of--turning out to be a blown "FUSE" related to low voltage short. It was code 24- yet you did not mention that number or the fix. You DID SAY Fuse-- It is a 3 amp ATO fuse on the circuit board. I read between your lines and found the problem. Thank You! Jim Simpson, ODD parts fabrication.
Thank you Craig. R to G at the fan control board, nada...and it's a new board..I will have to do some more thinking here as to why the variable speed DC fan motor (also new and new controller) worked for the AC but not when I turned the unit to HEAT.
Thank you for this video. I am having the problem of number 2 on your list. Today I replaced the run capacitor and it worked great for about 45 minutes. Tomorrow I was going to check the ohm ratings on the speeds. I would have really been confused when the ohms were checking out fine. Also I did notice little almost blackish particles all over the insides, must be the resin that used to be on the windings.
I have a Goodman ECM motor and it sounds like a jet airplane when it starts to crank up and it's very loud on Air Conditioning mode. However normal on Fan only. Have you heard of this symptom before?
Hi, my name is James, like your video's. I can't remember if or not you made a video about capacitors, however the - and + play a big factor. I am sure you are aware, anyway, got your book and excited to read all about it.
Thanks foe sharing. Great information. I have a unique system with my carrier system. For some odd reason, in the early morning hours, the fan motor does not turn on. I have to cycle the indoor breaker to get the motor to turn on. During the day the system acts normal. Any advice?
I am an electrical engineer that enjoys your UA-cam videos and a subscriber thereof.. "MFD" rating = microFarad; it would be more correct to call this the capacitor VALUE, not the capacitor RATING.. Normally the "rating" of a capacitor is its designed maximum operating voltage, not its capacitance. And suggest "10.2 OHMS, rather than just "10.2" But great video.
@@om6789gg , I actually agree with Dane. Although this is a really great instructional video (and a great instructor teaching it), the clarifications that Dane gave in his comment were justifiable. If someone who is watching these videos relating to HVACR is actually wanting to increase their knowledge and become an 'expert in the field', these facts represent logical truths. So it is only fitting to elaborate further on the subject by 1) explaining what the readings on the multimeter represent, and 2) differentiating between what the 'rating' and 'value' is in relation to a capacitor. 'Take a chill pill.' is something someone who is ignorant and lacks understanding would say. And, to elaborate further, the word 'ignorant'doesn't mean anything other than 'having a lack of knowledge on a particular subject. Right now, I am ignorant in the field of HVACR. But I think all of us watching these videos are learning to not be. 😏
Great video. I have an ECM blower motor on my Carrier fb4c unit. My problem is it will not shut off. I pulled the thermostat head and it kept running. Had to turn it off at circuit breaker box. I assume motor module is bad. I'd like to repair but I don't know what electronic part of it is bad. If it wouldn't turn on I could probably find it but not turning off has me scratching my head.
8:47 I jumped R to G then ran down to the basement to watch/listen. After ab 20 seconds, the 120/24v transformer emitted a bright blue flash/pop. I cut the power after that. Does this indicate any specific diagnosis that would be helpful in my now imminent conversations with hvac technicians?
Very informative video. The air blows with AC on but Not air blowing when the heater is on. and the heating element is running. What is the cause of this issue?
Thanks Craig! I replaced my capacitor because it tested 5.6 instead of 7.5. The blower worked great after that. But, a day later the blower didn't go on after the gas? Then, it did for a few days. Then, it didn't turn on after the gas, but just gave a louder than normal hum? But, if I manually spin the blower, that will get it going? Am I missing anything? Thank you, again!
This is definitely one if the best furnace trouble shooting videos ever. It'd work even better if you have a little knowledge and experience on elelctrical and electronic stuff . Thank you so much!
Question on the ECM module: I have a bad module and want to replace it. It's a GE ECM2.3 CP03. I see a lot of comments saying that the ECM needs to be programmed correctly from the factory. The replacement Lennox kit appears to be 10M08, but is over $500. Can I use any GE ECM2.3 CP03 that I find on ebay instead? And would a CP02 or CP04 also work? Specs for these seem difficult to find online
You teach the best , Thanks for this great job 👏👏👏 Sorry,I have problem in underestand wet and dry bulb temp,would please explain those and calculating super heat base on wet bulb temp, Would you please make video about that ? Thanks a lot .
Dominique, look up "acservicetech wet bulb" and look up "acservicetech superheat 4 scenerios" and also read the article on the total superheat method at www.acservicetech.com/articles
Great video. I have a question. The motor at my home runs only when it's cooling and heating. When I only turn the “fan on,” it doesn't work. I changed the thermostat, same issue.
Can the motor itself be cleaned and oiled to return to service? Troubleshooting mine...found the thermostat set to "on" which means the fan was running 24hrs...i don't know if dust /heat ruined the bearings or if it can be cleaned and tried again. Im not sure if i can spray electrical cleaner into copper coils of motor...seems thst could cause more damage.
If you had a furnace that was firing up ie draft motor, flame, but the blower motor sometimes wouldn't work and would go into lockout mode for an obstruction when there definitely wasn't one(two professionals and a lot of time investigating)how might you test that?
What about Dual Capacitor systems without a cap on the blower motor? My blower seems to work periodically, and it doesn't have a capacitor. It has 2 cable harnesses that plug in; one with C, L, G, N, and the other with 1 2 3 4 5. I checked and the harness is getting steady 123v, but when I plug it into the motor it sparks/pops, so what could be causing that? The motor has a removable butt plate with what I assume is a thermistor. A second cable with a 3 prong harness plugs into the motor on the inside.
Starting yesterday the circuit will trip in the house for the air conditioner. When I flip it back on it will trip again after about 5 to 10 seconds. I took the cover off of my air handler where my blower fan is in my basement. When I give power to it via the switch, a spark comes out of the back of the blower motor itself and trips the switch again. Something definitely appears to be shorting out. I'm assuming I need a new blower motor
So with your experience, what would be a well rounded meter. I have a fluke 324 and it's a bit of a let down. I do a lot of vrf building but haven't done much for service. Only 2 years in this trade. I've watched most of your vids and the uei seem to read all resistance when your demonstrating troubleshooting.
One question, I did the jumper of the thermostat wires coming into the motherboard the blower instantly came on does that mean that my thermostat or the wiring on my thermostat is not working properly?
Is it normal for the condensing unit to come on first and the Air handler fan to turn on after a 25 second delay. I don't think it was like this before. Is this some symptom of some thing coming... I am going to may be lube the fan blower if there is a lubing option available as a preventive maintenance. Thank You.
The capacitors on PSC motors used on compressors and fans on outdoor HVAC condensing units are always energized on most units. There is typically only one contact that opens that prevents the unit from running, but the other 120v feed is always energized. Does this arrangement actually contribute to wearing out the capacitors?
I woke up this morning to blower not working. I have it working again now, but I'm sure it's going to fail again. I seemed to have power in all the places I could test. I could not find a capacitor though. There's a 5 amp fuse on the panel. I checked that fuse and it was fine, but when I reseated it and checked again it started working. I had reset the breakers a time or two before this while testing. I'm not sure what pulling the fuse that the breakers didn't do, if anything?
Yes, make sure it is about 1.5x the AC Voltage that powers the motor. For example, if your motor is running with 240 VAC, then you want a capacitor that has a rating of 370 VAC or higher. And also make sure the microfarad value is the same as the old cap you're replacing.
Dennis, you can find any of the blower motor troubleshooting videos with this playlist, thanks!- ua-cam.com/play/PLxnHR5_D2ojysb57KfR95xEU_B4Wbw_SK.html
Aside from fan motor or circuit board issues, WHAT is the connection to the evaporator receiving compressed freon and cooling and the fan operating (assuming the thermostat is calling for cool)? Is it only a timer that energizes the blower fan once the compressor is running or is there a thermal switch on the evaporator that senses cold and energizes the blower motor?
On a call for cooling your fan will start regardless of the refrigerant. Your G terminal energizes the fan and the Y terminal energizes the compressor. The compressed vapor goes to the condenser and from there it travels to the evaporator as high pressure liquid.
Question: Hi my condenser fan motor would not turn on all I heard was loud humming and the motor was extremely hot I couldn’t touch it. I checked starter capacitor for the fan it should be 7.5 microfarads mine was 4.3 I changed it and everything worked fine for a week then same thing happened. I gave it a push on the blade with a screwdriver and it still wouldn’t start, I checked the capacitor again it’s good, I checked the resistance of the fan motor black to orange wire 23ohm black to blue 22.4ohm blue to orange 45ohm, I also megged it with (fluke 1587) black, orange and blue wire to fan motor housing at 500V and got 550mohm of resistance on each winding. Also my motor shaft has about 1/4 of play in and out I’m not sure if that’s ok? From reading stuff online all of the electrical checks seem to check out do you think I should change the fan motor? Thank you.
You are very knowledgeable! Can you come over and fix my ac blower motor? I just installed a brand new ECM blower motor. It worked for about 6 hours and then stopped working! I think the module caps are not working anymore. Brand new motor installed correctly and now what to do? I’m a DYI homeowner, not an expert.
I have central A/C and is working fine. I noticed today when the outside unit shuts off the inside furnace which blows the air stops at the same time. I never noticed that before, I thought it would run briefly then stop. Is that normal? Thanks!
I have air handler blower motor that will not run even when thermostat is switched from auto to on. The outdoor compressor is also not running. I have checked and have power to both units. What unit do I trouble shoot first?
So, what if when I measure voltage between red and green, it reads 18 volts? Could that be the problem? The others read 27 volts. Why would green read 18 volts? Damaged wire? Short somewhere?
Hello I would like to know the name of this sensor that will turn on my hvac fan before the compressor. Show there wouldn't be such a big jolt Causing a loud hardstart.
Following your checklist, I was able to eliminate all possibilities except #6 - failed control board. Sure enough, when I pulled the board out and inspected it closely, one of its tiny components had been deep-fried. Thirty minutes later after a trip to a local supply house, the blower was running normally again. Fixing problems like this can be simple; identifying what needs fixing is where expertise like yours is so valuable. Many, many thanks for sharing!
After too many hours of youtube to admit, I still haven't solved my problem. But this is by far the most informative video I've seen, thank you very much!
What did it end up being?
@Fade9d9 Still don't have heat but luckily I live in Florida. I use the oven and a fan like when I was a kid 😅
@@clayman7853 Jesus, two years and still not fixed... Bruh
Former USAF 3E tech from 20+ years ago. I enjoy watching your videos to remind me of a past life with zero stress and working with my hands.
I always enjoyed working with my hands, creating and fixing, thanks Robert!
AC Service Tech has the best HVAC channel on UA-cam. Always top-quality videos!
Thank you so much David!
Passed my EPA 608 Cert. and moved into our HVAC group. Just bought your book and appreciate your detailed descriptions. It’s good to a newbie like me. Cheers!
Thats awesoem and congratulations!!!
Why would anyone give this video a thumbs down? You couldn’t find a better video explaining what could be wrong with your blower. People hate for no reason other than to be ignorant.
I like the way you explained everything. Step by step no way you can miss it .You are the master of HVAC thanks again Craig.
Glad you enjoyed it Fernando!
Wow. Thorough is an understatement. If I spent a few hundred hours on this channel I might never need a tech service call.
Excellent tutorial. Step by step troubleshooting, very good camera work, clearly understood audio. Kudos.
AGREED!! This guy is nearly the only thing hvac related worth tuning into. All killer and no filler.
SIR - You are God Send Help. THANK YOU A MILLION AND I WILL NEVER FORGET YOU.
My situation was the Inside Air Handler or Evaporator Blower motor wouldn't turn on, while the outside compressor condensing unit will turn on. I was afraid that the air handler motor /Capacitor / relay would be the culprit and perhaps even the controller board. I have changed the motor / cap and relay on the condensing unit but never messed with the Air Handler Blower or the inside unit and was dreading it. Your Video saved me from no telling what kind of an expensive ride I would have had with those AC repair service surprises. Mine is a 35 year old Goodman unit and probably doesn't have the ECM etc since it is a single speed motor. I watched your video in full and was going to go step by step. I followed Step 7 (the thermostat) first since it was easy and never knew thermostat could cause an issue while allowing the condensing unit to come on. I removed the Battery, measured the voltage was reading 1.334 and was hoping a new BATT would help. Guess what i put a new battery and the Fan handler came on and the AC is working now. Never realized that thermostat showing to be in working shape could cause this. May God Bless you for your Great Service and Once again a Big Thanks to you and you are TRULY GOD SEND HELP.
One question sir - Is it normal for the condensing unit to come on first and the Air handler fan to turn on after a 25 second delay. I dont think it was like this before. Is this some symptom of some thing coming... Thank You.
Very very helpful (understatement of the year) . You helped me narrow down what was going on with my blower motor. It was a bad thermistor in my ECM. You easily saved me a grand or 2!
Thank you. This is one of the best explained troubleshooting videos on UA-cam.
Thank you for putting together this very helpful list of common HVAC issues. Very logical with clear testing steps.
Thanks Craig. Bought your book on Amazon recently. Love it. Worth every penny & then some. Thank you for giving back to society.
Wow. You present the material so well. Very concise, and to the point. And it is great to see what an experienced person does in this situation. Thank you !
You got my attention at 8:50 with your yellow magnetic jumper wire. Never seen these anywhere before and I see Amazon has them. I troubleshoot a lot of industrial machinery and with most of the terminal strips there is no way to attach a meter lead and a person only has two hands. I was going to make some of these leads and bought and received some small neodymium magnets. Another thing is why a person should use a bleeder resistor instead of a screwdriver to discharge a capacitor is because some capacitors have an internal fuse and if you use a screwdriver you run the chance of blowing the fuse besides blowing the tip off of your screwdriver. Great job.
My blower is shorted to ground and it looks just the one at 2:24. What do you get these replacements?
A note on the thermostat face: after I changed my batteries, I still had to jump one of the connections before the face could become functional again. I also tested my cap, it was on the lower end of its capacitance rating, but I wonder if draining it and putting it back did something as well… one of my EE coworkers recommended I try that specifically.
Anyway, thanks for the awesome video!!
the best video about a blower motor! Im a new home owner with a Lennox gas furnace and this video is amazing! thank you so much, i just subscribed!
You're an excellent teacher. Thank you! You explained everything well and made it easy to digest.
Thank you so much for your wonderful tutorial, excellent information. Was able to easily fix the problem. Dead batteries, and a fan that had been turned to automatic. God bless you. Saved a visit from HVAC for something so simple.
Thanks. By testing my blower motor resistance and not seeing/smelling any indication of burning, and noticing the motor turned freely I purchased a new control board and that fixed the problem!
The module or the big control board?
@@Superschemer34 It was the "Fixed Speed Furnace Control Replacement Module" as listed on the box. Mine was made by ICM Controls. Model ICM282A if you want a reference
Whew! It was the thermostat batteries. This just happened tonight. I heard the burner ignite and the gas flow but noticed the fan didn’t start a few minutes later like it normally does. I turned off the heat and turned on the fan and nothing. I’m thinking the fan motor is shot or maybe the capacitor. Did a quick YT search and found your video. I never would have thought of the thermostat batteries. The display did not show the BATT indicator. I replaced the batteries and the fan is working. Thank you.
Thanks for the video...did the easiest thing and checked the batteries...yup, they needed replacing...thank you!!!
Almost perfect. Good to show at the beginning the location of that blower.
Really informative and concise. One of a kind! Watched many videos this is by far the best imho.
Very helpful video, than you!
The blower fan stopped working , meaning NO ac in the house, I opened the panel and disconnected blue cable which is the medium speed, and connected the black high speed and blower working again. Do you think that the issue is in the motor? Will appreciate your feed back.
You make the most clear videos. Thank you. That’s why I bought your Hvac book and I’m a dentist!
Glad you like them!
You are the best info on hvac..thanks
your channel pretty much put me in the position to almost fully diagnose what has gone awry with my 3.5ton carrier heatpump package. sadly i have not isolated the problem as of yet. the original problem: indoor fan blower moves freely with no noise and is seated properly but motor movesonly in a stop go fashion (small movements). compressor comes on, bottom of accumulator and some of the lines frost over (ambient outdoor temp is 107 between Noon and 1700 )since it is an older 42 size system i felt it prudent to start replacing the usual culprits:
capacitor. hard start kit. defrost board. single pole contactor. replaced blower motor. thermostat good.result: same issue. outdoor fan is fine. condensator coils and ubends look good, unit very clean. wiring clean. no obvious oil deposits anywhere on copper lines, valves, connections.
what's next? replace fan board? refrigerant charge/leak?
Thank you for making this video. It was extremely helpful in diagnosing what was going on with our HVAC and helped me to save a lot of money on a costly big repair.
Excellent video, very informative. This is the most comprehensive video I’ve seen on this topic.
Glad it was helpful!
Perfect video thanks! I was told yesterday that my blower motor AND module were bad on an ECM motor. After watching this though I'm not thinking that's the case. Gonna check it out myself now.
Thank you sir, going crazy, bought contactor, new board, capacitor, just to find out now, it's the thermostat. Never thought it would be that, but if it wasn't for this video, probably would have called a hvac company. Thanks again. 👍Great video..
I'm going crazy also....I by passed my thermostat and my motor is not running....motor is 2 years old....control board is a year old.....blah
Thank you for this video. I was close to having to pay for a tech to come out and tell me that my thermostat plate was bad. I have a new one on the way!
Great and informative video. Been working for hours trying to figure out what is wrong with my HVAC. Hopeful the things I try in this video will work. Will report back soon.
Please let me know if this worked for you. I have a similar issue in my house.
@@rcm-tr1be Turns out, it wasn't my blower the whole time! Who would've thought. My circuit board was sending power to everything EXCEPT the blower, so I had to splice my line in 120V temporarily until I get a new board. Crazy right?
Your videos are the best out there. Thank you so much for sharing your knowledge. 🤙🏽
Thank you! I carefully followed your process and was able to quickly identify and solve the problem. Turned out to be a bad thermostat face. When I swapped with another thermostat from a 2nd zone the unit immediately worked! But Ironically the problem unit is working in the 2nd zone! How do you explain that?
Thanks for sharing this info. I replaced my blower motor several years ago and it has worked fine until this year. If I put it on fan on constant and it starts it will run for ever until I turn it off. If I leave it on automatic it may or may not start when the compressor runs. I'll check these points you have shown us. I only work on this stuff every few years and I have put this off for months just letting the fan run constantly and wasting a lot of power. Getting too old to crawl around in the attic have had four knee surgeries in the last two years so I have plenty of excuses. LOL!
Did you figure it out the problem?
I have the same issue
Great video with excellent component and testing explanation. Thank you!
I blew up a screen shot to view the code number you read description of--turning out to be a blown "FUSE" related to low voltage short. It was code 24- yet you did not mention that number or the fix. You DID SAY Fuse-- It is a 3 amp ATO fuse on the circuit board. I read between your lines and found the problem. Thank You! Jim Simpson, ODD parts fabrication.
Thank you Craig. R to G at the fan control board, nada...and it's a new board..I will have to do some more thinking here as to why the variable speed DC fan motor (also new and new controller) worked for the AC but not when I turned the unit to HEAT.
Great work Craig!!!🎯 keep the good work, and do more of troubleshooting, only you can be specific and clear, 👍
That's awesome encouragement Robert, thanks!
Thank you for this video. I am having the problem of number 2 on your list. Today I replaced the run capacitor and it worked great for about 45 minutes. Tomorrow I was going to check the ohm ratings on the speeds. I would have really been confused when the ohms were checking out fine. Also I did notice little almost blackish particles all over the insides, must be the resin that used to be on the windings.
I have a Goodman ECM motor and it sounds like a jet airplane when it starts to crank up and it's very loud on Air Conditioning mode. However normal on Fan only.
Have you heard of this symptom before?
Great video! Keep these videos coming Craig! U r the hvac king lol!
Thanks! Will do!
Hi, my name is James, like your video's. I can't remember if or not you made a video about capacitors, however the - and + play a big factor. I am sure you are aware, anyway, got your book and excited to read all about it.
Yes the + or - 5% to 6% from the rated capacity rating! Thanks and please let me know what you think of the book after reading it!
Thanks foe sharing. Great information. I have a unique system with my carrier system. For some odd reason, in the early morning hours, the fan motor does not turn on. I have to cycle the indoor breaker to get the motor to turn on. During the day the system acts normal. Any advice?
I am an electrical engineer that enjoys your UA-cam videos and a subscriber thereof.. "MFD" rating = microFarad; it would be more correct to call this the capacitor VALUE, not the capacitor RATING.. Normally the "rating" of a capacitor is its designed maximum operating voltage, not its capacitance. And suggest "10.2 OHMS, rather than just "10.2" But great video.
Thanks Dane!
Take a chill pill
@@om6789gg , I actually agree with Dane. Although this is a really great instructional video (and a great instructor teaching it), the clarifications that Dane gave in his comment were justifiable.
If someone who is watching these videos relating to HVACR is actually wanting to increase their knowledge and become an 'expert in the field', these facts represent logical truths. So it is only fitting to elaborate further on the subject by 1) explaining what the readings on the multimeter represent, and 2) differentiating between what the 'rating' and 'value' is in relation to a capacitor.
'Take a chill pill.' is something someone who is ignorant and lacks understanding would say.
And, to elaborate further, the word 'ignorant'doesn't mean anything other than 'having a lack of knowledge on a particular subject.
Right now, I am ignorant in the field of HVACR.
But I think all of us watching these videos are learning to not be. 😏
@@ParabellumX i completely agree with you
it matters... good call.
Your the man , I think I watched a similar video of yours from years ago but you have to keep learning the basics over and over again, thank you
I appreciate that!
Great video. I have an ECM blower motor on my Carrier fb4c unit. My problem is it will not shut off. I pulled the thermostat head and it kept running. Had to turn it off at circuit breaker box. I assume motor module is bad. I'd like to repair but I don't know what electronic part of it is bad. If it wouldn't turn on I could probably find it but not turning off has me scratching my head.
8:47 I jumped R to G then ran down to the basement to watch/listen. After ab 20 seconds, the 120/24v transformer emitted a bright blue flash/pop. I cut the power after that.
Does this indicate any specific diagnosis that would be helpful in my now imminent conversations with hvac technicians?
Very informative video. The air blows with AC on but Not air blowing when the heater is on. and the heating element is running. What is the cause of this issue?
Thanks Craig! I replaced my capacitor because it tested 5.6 instead of 7.5. The blower worked great after that. But, a day later the blower didn't go on after the gas? Then, it did for a few days. Then, it didn't turn on after the gas, but just gave a louder than normal hum? But, if I manually spin the blower, that will get it going? Am I missing anything? Thank you, again!
This is definitely one if the best furnace trouble shooting videos ever.
It'd work even better if you have a little knowledge and experience on elelctrical and electronic stuff .
Thank you so much!
What setting are you on when checking resistance / oms
Awesome step by step on point instructions very therall.. a can't miss with repairs.
How about the reset button first?
Question on the ECM module: I have a bad module and want to replace it. It's a GE ECM2.3 CP03. I see a lot of comments saying that the ECM needs to be programmed correctly from the factory. The replacement Lennox kit appears to be 10M08, but is over $500. Can I use any GE ECM2.3 CP03 that I find on ebay instead? And would a CP02 or CP04 also work? Specs for these seem difficult to find online
You teach the best ,
Thanks for this great job 👏👏👏
Sorry,I have problem in underestand wet and dry bulb temp,would please explain those and calculating super heat base on wet bulb temp,
Would you please make video about that ?
Thanks a lot .
Dominique, look up "acservicetech wet bulb" and look up "acservicetech superheat 4 scenerios" and also read the article on the total superheat method at www.acservicetech.com/articles
@@acservicetechchannel
Thanks a million
What about the blower motor reset button? Or does the light switch mounted on the side of the furnace pretty much do the same as a reset button?
Great video. I have a question. The motor at my home runs only when it's cooling and heating. When I only turn the “fan on,” it doesn't work. I changed the thermostat, same issue.
@@robertadams6017 I didn't find a solution. The blower (furnace) runs only when I set the AC to cool/heat. With “fan on”, it doesn't work.
Thank you! At the #3, what if I test the blower common and capacitor wire, one is 45ohm, and another is 0ohm?
Can the motor itself be cleaned and oiled to return to service? Troubleshooting mine...found the thermostat set to "on" which means the fan was running 24hrs...i don't know if dust /heat ruined the bearings or if it can be cleaned and tried again. Im not sure if i can spray electrical cleaner into copper coils of motor...seems thst could cause more damage.
If you had a furnace that was firing up ie draft motor, flame, but the blower motor sometimes wouldn't work and would go into lockout mode for an obstruction when there definitely wasn't one(two professionals and a lot of time investigating)how might you test that?
FROM CHICAGO EXELENT VIDEO THANK YOU SO MUCH
You are welcome!
Very detailed, what was the name of the tool you used to check blowers? Thanks!
TecMate Pro
Thanks for letting him know Justin!
Another great, in depth video. Thanks for posting.
Glad it was helpful!
What about Dual Capacitor systems without a cap on the blower motor? My blower seems to work periodically, and it doesn't have a capacitor. It has 2 cable harnesses that plug in; one with C, L, G, N, and the other with 1 2 3 4 5. I checked and the harness is getting steady 123v, but when I plug it into the motor it sparks/pops, so what could be causing that? The motor has a removable butt plate with what I assume is a thermistor. A second cable with a 3 prong harness plugs into the motor on the inside.
What does a very low ohm reading (0.06) indicate on one of the capacitor leads?
Starting yesterday the circuit will trip in the house for the air conditioner. When I flip it back on it will trip again after about 5 to 10 seconds. I took the cover off of my air handler where my blower fan is in my basement. When I give power to it via the switch, a spark comes out of the back of the blower motor itself and trips the switch again. Something definitely appears to be shorting out. I'm assuming I need a new blower motor
Also when you buy it new , does it come with new circuit board mounted already or you move old one to new ?
Always looking forward on your new video
Glad to hear it!
So for troubleshooting is the uei meter a choice ?
I like them- UEI, Fluke, Fieldpiece!
So with your experience, what would be a well rounded meter. I have a fluke 324 and it's a bit of a let down. I do a lot of vrf building but haven't done much for service. Only 2 years in this trade. I've watched most of your vids and the uei seem to read all resistance when your demonstrating troubleshooting.
the UEI 489 is a good one, thanks!
One question, I did the jumper of the thermostat wires coming into the motherboard the blower instantly came on does that mean that my thermostat or the wiring on my thermostat is not working properly?
Is it normal for the condensing unit to come on first and the Air handler fan to turn on after a 25 second delay. I don't think it was like this before. Is this some symptom of some thing coming... I am going to may be lube the fan blower if there is a lubing option available as a preventive maintenance. Thank You.
Great video thanks
This video is a big help. Thanks for posting this.
Top quality instructional video.
Did you make that bleed resistor or did you buy one ?
The capacitors on PSC motors used on compressors and fans on outdoor HVAC condensing units are always energized on most units. There is typically only one contact that opens that prevents the unit from running, but the other 120v feed is always energized. Does this arrangement actually contribute to wearing out the capacitors?
I woke up this morning to blower not working. I have it working again now, but I'm sure it's going to fail again. I seemed to have power in all the places I could test. I could not find a capacitor though. There's a 5 amp fuse on the panel. I checked that fuse and it was fine, but when I reseated it and checked again it started working. I had reset the breakers a time or two before this while testing. I'm not sure what pulling the fuse that the breakers didn't do, if anything?
Wow excellent thank you for teaching us everything I can’t wait to start studying HVAC muchas gracias
You can do it!
I can’t find a capacitor anywhere. Do some model blowers not have them?
Can't help but tune in to another great video 👍 something i can share with our new guy thanks craig keep the good stuff Rolling my friend 🙏
Thanks a lot Esmar!
thn Garcia
Do we need to check the vac rating along with microfarad rating while installing a cap to blower ?
Yes, make sure it is about 1.5x the AC Voltage that powers the motor. For example, if your motor is running with 240 VAC, then you want a capacitor that has a rating of 370 VAC or higher. And also make sure the microfarad value is the same as the old cap you're replacing.
Great content, i believe you had a vid on how to troubleshoot ecm motor without a special tool, maybe you can add a link of that video
Dennis, you can find any of the blower motor troubleshooting videos with this playlist, thanks!- ua-cam.com/play/PLxnHR5_D2ojysb57KfR95xEU_B4Wbw_SK.html
Would a power surge during a lighting storm affect the motor? If so what would be the common symptoms of parts to check?
Aside from fan motor or circuit board issues, WHAT is the connection to the evaporator receiving compressed freon and cooling and the fan operating (assuming the thermostat is calling for cool)? Is it only a timer that energizes the blower fan once the compressor is running or is there a thermal switch on the evaporator that senses cold and energizes the blower motor?
On a call for cooling your fan will start regardless of the refrigerant. Your G terminal energizes the fan and the Y terminal energizes the compressor. The compressed vapor goes to the condenser and from there it travels to the evaporator as high pressure liquid.
Question: Hi my condenser fan motor would not turn on all I heard was loud humming and the motor was extremely hot I couldn’t touch it. I checked starter capacitor for the fan it should be 7.5 microfarads mine was 4.3 I changed it and everything worked fine for a week then same thing happened. I gave it a push on the blade with a screwdriver and it still wouldn’t start, I checked the capacitor again it’s good, I checked the resistance of the fan motor black to orange wire 23ohm black to blue 22.4ohm blue to orange 45ohm, I also megged it with (fluke 1587) black, orange and blue wire to fan motor housing at 500V and got 550mohm of resistance on each winding. Also my motor shaft has about 1/4 of play in and out I’m not sure if that’s ok? From reading stuff online all of the electrical checks seem to check out do you think I should change the fan motor? Thank you.
Insulation tester is a good tool aswell to check the windings to ground
Absolutely!
You are very knowledgeable! Can you come over and fix my ac blower motor? I just installed a brand new ECM blower motor. It worked for about 6 hours and then stopped working! I think the module caps are not working anymore. Brand new motor installed correctly and now what to do? I’m a DYI homeowner, not an expert.
Can you order the blower motor by itself? I can only find the entire blower assembly for sale
This was extremely helpful. Thanks!
Glad it was helpful!
I have central A/C and is working fine. I noticed today when the outside unit shuts off the inside furnace which blows the air stops at the same time. I never noticed that before, I thought it would run briefly then stop. Is that normal? Thanks!
I have air handler blower motor that will not run even when thermostat is switched from auto to on. The outdoor compressor is also not running. I have checked and have power to both units. What unit do I trouble shoot first?
So, what if when I measure voltage between red and green, it reads 18 volts? Could that be the problem? The others read 27 volts. Why would green read 18 volts? Damaged wire? Short somewhere?
Hello I would like to know the name of this sensor that will turn on my hvac fan before the compressor.
Show there wouldn't be such a big jolt Causing a loud hardstart.
I don't have a compactor on my blower and I don't have a circuit board. Is it because my furnace is a really old model? So what else should I do?
Great video fixed my problem