Furnace Overheating - 10 Reasons Why
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- Опубліковано 30 чер 2024
- Is your furnace overheating and perhaps blinking an overheating code (usually 4 blinks) on the control board? A furnace that keeps tripping the high limit or overheating can be caused by a variety of things. Some of them are simple fixes and others can be tricky to track down. So hopefully this video will help you find what is causing your furnace to overheat and get it fixed!
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#wordofadvicetv #furnace #heating #hvac #airconditioner #airconditioning
As a retired educational administrator, it was my responsibility to assess teacher. You have earned superior rating as far as I am concerned. Clear in your explanations an methodical in your presentations. You really “ know your stuff!”
I am a retired hvac service tech,,by watching this video it reminded me of the old days.You are a very good teacher these young tech's can learn lot from you. Keep up the good work.
This video was gold. It should be a part of every apprenticeship program
Glad to hear it was useful! Thank you!
You are my go to guy on UA-cam!! With your help I've managed to fix my furnace twice & my neighbor's once this past year. One circuit board, 1 ignitor and most recently a failed hi temp switch stuck open. The HVAC company my neighbor called wanted $1200 to replace the circuit board to fix the last problem. (Jeez). Then tried to sell him a new furnace & A/C for a total of $17,000. Thank god for Amazon Prime & you young man!!!
No matter how intelligent (at DIY) we are it is helpful when another person gives their wise experience--great video.
Yup! I've always been a guys grown up on DIY but never pass up the opportunity to learn from someone else!
best how to youtube video ever. phenomenal depth of knowledge and detail. Exactly what I wanted.
You have the best HVAC channel on UA-cam ! I recently finished hvac school and I’ve been doing my own service calls on my own. I reference your videos all the time. You have explained everything so simple that it makes sense.
You are very advanced in the field of heating. You are very articulate . Thats the reason I watch your channel. Without you sharing this knowledge I would have been in the cold this evening. You saved me . Thank you.
I am watching this video at 1am and working on getting my heat going. This video was very helpful. Thank you!
Dude, thank you for all that you do. You are probably the best teacher I've had so far. Any apprentice of yours is probably lucky.
Thanks man, but I am far from having an apprentice :) I just work with some good veteran techs. If they had a UA-cam channel, they would put mine to shame lol.
There is a lot of good information being related to us in this video. Thanks for taking the time to make the video. On the weak blower motor slowing down, sometimes a good oiling of the bearings in the motor will fix that problem but most people just replace the motor.
Great Job! Clear, concise and easy to understand just like all of your video's. I also want to give a shout out to your camera person, great job there too.
I would love to meet this man’s parents, shake their hands, and congratulate them on their wonderful contribution to this trade and society.
Thank you sir!! I'll show this comment to them, I'm sure it'll bring them joy. 🙂
Love your videos. You explain so perfectly and it all makes sense in the end. Also love how many times you said "that's not what this video is about" but it gave me more useful information. Thank you and you are good on the eyes to watch 😉
after a month of troubleshooting my furnace, flame sensor, high limit, and pressure switch i stumbled across this video and ive never heard that gas pressure could be too high. well mine was and i got it adjusted and now my furnace works perfectly!
I have looked for a long time to find a video to explain all of this.
THANK YOU !!! I have a furnace that is over heating and the technician has been out 4 times and can't figure it out. You are the best.
That A-Coil seems very difficult to access. This is such a great channel. You have a firm and practical grasp on HVAC. You are a great teacher.
Hi, fellow former HTC alumni here! You asked for comments on other fixes. I had a brand new Goodman 60K BTU furnace installed a week ago. Learned from you how to read the fault code by taping the interlock switch, and was getting 9H EE3 code. Service manual indicated probable open limit switch, and possible causes, including blower motor & connections. Since they connect directly to the control board, I reseated (aka disconnect/reconnect) all the connectors I could find on the board and also on the blower. Problem solved! (So far anyway). As a former system engineer we would sometimes get brand new name-brand servers with issues that could often be fixed simply by reseating balky connectors. Over time and with heat connectors can also partially fail, and simply need to be reseated.
This guy really knows his stuff. Head and shoulders above your average hvac technician
Fixes mine today, flame sensor was dirty. Thanks to you . great job!!
This is one of the most informative videos and his series. I went through every single steps to check every single issues regarding my short cycling / overheating issues. My furnace when the temp is extremely cold cant bring my house up past 64 F. Upon checking, my heating cycle is about under 5 minutes. After checking each steps from this video, apparently it was short cycling because of high limits detected overheating and automatically shut down my furnace flames. after following and checking Jay's instructions, it was my gas pressure issue (time in the video is 19 minutes and 40 sec in case you didnt know what i was referencing). My gas pressure was way too high, and thus overheating triggered the shutdown to the furnace. i adjusted the gas pressure in the module to the proper pressure (ps: do not do this yourself if you are a complete novice) and now my furnace and blower cools just right to have continious heating (last run the flames came on and the heating exchanges were cools for continue run) for 30 minute until the house was at the temperature set. Many thanks Jay for this informative video.
Thank you for taking the time to share that David! Glad you were able to track down the problem and get it fixed! I was a little vague on how to check and adjust the gas pressure since I didn't want someone who is not sure of what they are doing to try that (like you mentioned as well). Stay warm! :)
Thank you for the help! There was a piece of cardboard on top of our A coil!!! Roll back sensor kept tripping. Thanks to your video you possibly helped our house not burn down! We don’t know how that cardboard got there but it was blocking one whole side of the A coil. Now we have heat after a week!
Excellent job teaching I’ve been in the HVAC industry for many years
First off Jay I want to thank you for your time making these videos. I've been following and watching your channel. You sir are dead on! Side note an amp meter helps find a weak blower motor. The amp reading will not match spec. Thanks again.
hi You explain so perfectly and it all makes sense in the end. Also love how many times you said "that's not what this video is about" but it gave me more useful information. thanks
I was able to follow his instructions , heater is up and running!!!! Thank you.!
Loved seeing the inside of the high limit, very cool, thank you
You make the BEST furnace videos. Thank you!
Great video. I appreciate the detail to describe the issues and how to resolve them. The problem with my 90% efficiency propane furnace began when it started cycling continuously and would not ignite. I called my local HVAC tech and of course it worked great while she was testing it. Her diagnosis was that I needed a new pressure switch at the price of $400. Immediately I went online and found one for $25. I paid the service call and respectfully sent her on her way with a message about price gouging. I installed the pressure switch and my furnace still kept cycling without igniting. During the inspection I noticed that my inducer motor was laboring and making a whining noise. So I replaced it as well. After that, my furnace still had difficulty igniting. Then I decided to check my condensate trap and it was plugged. After I cleaned the trap and reinstalled with my new pressure switch and exhaust blower it still did not cycle. I can get my furnace to ignite and run for one cycle and after that it shuts down until I reset the breaker. I started investigating and found that the thermister on my control board was very hot to the touch after the furnace got up to temp. After the circuit board cooled down it will ignite and run for a cycle until it gets hot again. No soft lock outs. Can you explain how this? My next option is to replace the circuit board. I hope that fixes it. Let me know if you have any other ideas. Thanks.
This is why good techs cost so much, so you're not just blindly replacing parts. I'm sorry your first tech didn't fix the problem
Dude I’ve found myself coming back to your videos. They really help more then my school text books do lol
I'll take that as a compliment ;) Thanks man! Glad you find my videos helpful!
Same here haha
Once again great video, easy to understand.
Been learning from you and you're a great teacher! love it when you get completely off topic 😂
Haha thank you! Good to know some people don't mind the side-tracking :) I get comments that are the opposite: "Get to the dang point man". I appreciate the comment, thanks for watching! Happy Thanksgiving to you and family!
This is the best furnace troubleshooting video I have seen. Thx!
Man bro the pictures you include when you give an example is awesome real talk. Explanation are good but the pictures bring it all together by seeing a partial plugged or totally plug evap coil, thanks.
excellent explanation. Your method of explanation for HVAC work is exceptional! thank you for sharing your knowledge!
Very informative, and straight to the point! Thank you
Your work is great and the videos very helpful. Thank you and keep at it. Could you create a video on DIY yearly maintenance for the furnace?
Very good video. It is great to reference during overheating Furnace calls.
Great Video thank you for showing us all these possible reasons for overheating. Thank you again.
Glad you like the videos! Thank you for watching and commenting!
Wow, very good! Right now I’m dealing with a Carrier furnace that trips out at 165 degrees. Possible cracked ring in heat exchanger.
Your video is the best on the internet! Thank you!
Really helpful! Thank you so much! Was looking for the root cause why my furnace has random high limit switch open, of course it is not the switch itself.
Thank you!!!
Thank you ,your program is always helpful.
Good video with a lot of tips to fix the hvac in your home, Thanks it help me a lot
What a fantastic video. You are extremely knowledgeable and explain concepts really well. An additional thing to check for variable speed blowers is the DIP switch settings. On my Carrier 59TP6, SW1-4 is the comfort/efficiency adjustment which reduces the fan speed when set to ON (default) by 7% (single stage) and 10% (2 stage). Additionally, SW1-3 is the Low Heat Rise Adjustment which is used when you have a bypass Humidifier which reduces the airflow by 16% when set to ON. Make sure these are set correctly to get sufficient airflow.
Thank you for the great comment. I've been thinking of the cause of the failure (Code 33 then code 13 to lock out for 3 hours time to time) of my brand new Carrier furnace with a bypass humidifier. The Furnace threw the error code intermittently during the cold days (around -20C) and finally figured it out. I haven't touched SW1-3 but just by turning OFF SW1-4, fixed the Error code 33. limit circuit fault. installer did not adjust the setting and had no clue how to figure this out. had to pay them $100 for the service but all they said was change the filter and don't block the return air... what a great advice for $100... anyhow, I am thinking of adjusting SW1-3 now that it actually reduces the airflow by 16%... monitoring the furnace for a couple days...(I live in Ontario, Canada and the temperature changes dramatically everyday...)
@@ericchoi1610 I live in Ontario as well. Last year my Furnace would overheat in the mornings when the 2 stage kicked in after the overnight programmed temp moved from 19C to 23C on particularly cold nighs. This would reset my Ecobee 3 because the overheating would cut power to the thermostat.
I ended up switching SW1-3 to the ON position. This switch, when turned on, increases the low heat airflow by 18% to compensate for a by-pass humidifier, which I do have.
I also switched SW1-4 to the off position. This switch as mentioned above, when switched on decreases the low heat(single stage) airflow by 7% and high heat (2nd stage) airflow by 10 percent. With these 2 changes, I ensure maximum airflow, reducing any hot air from accumulating in the furnace.
Glad it helped you out as well.
What an awesome video. I think you just taught me HVAC in one video!
Glad you liked the video! This video is only the tip of the iceberg though :)
Just such an helpful video. Solved my problem . A Coil. Thank You. Keep up the good work
Glad I was able to help! :)
Excellent video. Lot of in depth info. I recently was told by an HVAC repair guy that I should replace my 23 yr. old furnace. The estimate for that was $3000. He also said that the inducer fan assembly needed to be replaced. The estimate for that was $500. I told him I would think about it. I did agree with him that the inducer fan assembly needed replacing because the duct housing had cracks in it (it was plastic, and of course over time heat will cause the plastic to deteriorate and crack. So I bought a replacement on line (which had a metal housing) for $169 with free shipping. It took me approximately 20 minutes to replace the old with the new using 2 tools, a screwdriver and a needle nose pliers. I totaled up the cost of me replacing most of the major components as necessary and it was way below $3000. I think the only thing I would make me buy a new furnace would be if the heat exchanger failed as my furnace is not easily accessible to work on. Thanks for the tips on how to inspect the heat exchanger and the filter replacement reminder.
if your old inducer assembly was plastic its likely because its a 90% furnace and has condensation. so if you used a metal one you have a problem there.
Should of jumped on the 3000 new furnace. That's a good deal and it would probably come with 10 year parts and labor or 5 minimum, but I would aim for and company with 10
Thanks for this great video. Please make some repair videos on high-efficiency furnaces as mid-efficiency furnaces are now rare in Canada. Thanks again
You are right! Perhaps I can film some videos at my dad's house later on.. He has a new 97% Carrier.
Awesome video. Another issue I've run into regarding airflow, is dampers or zoning system issues.
About to call a professional but great video for general knowledge and knowing what questions to ask the Technician when they come out.
Highly informative.... I trip on high limit and found the inlet hole in the can was smaller than the filter... the drunk HVAC guy didn't cut the hole big enough causing restricted airflow, because when I ran it without the filter it did not trip high limit... this is a new furnace...
As always, love your educational videos. Very helpful to DIYers out there no doubt. Do you happen to have video of you cleaning a dirty evap coil? Would love to see one. Once again, thnx for what you do!...
Vacuum with soft bristle hose, plus compressed air, plus evaporator coil cleaner. Super easy, barely an inconvenience
Looking forward to the video on cleaning your coil! It’s on my list to do as well.
Lol, it's not my favorite thing to do so it will likely get pushed out till later :)
Wow what a great video, thanks for taking the time to share your knowledge. I have a York that fires and runs for about 10 mins then shuts down with a 4 light flash. I thought it was the filter, but a week later it did the same. I guess I will need to check the high temp switch. Yesterday once it threw an 11 blink code too.
Great video! Very informative and helpful. Thank you!
Glad to hear that! Thank you for watching and commenting!
Very informative video. I have an American standard freedom 90 single stage furnace that is giving a few issues. 4 beeping light error but there are times when the furnace would blow hot air, after it reaches the limit it would stop but continue to blow cold air. Sometimes it blows hot air for 5 minutes sometimes am hour or two, it's inconsistent. I have a new air filter and a new limit switch and still the same result. Total newbie here. Thanks.
Thanks for sharing the knowledge
Super helpful video! Thank you!!! How about doing video about maintenance? How often, why and what exactly need to clean?
Thank you! I may make a video like that down the road
Thanks so much The same thing happened to me, it turned on and off all the time it did not stay on thanks to your video I fixed it💯💯👍👍
I gain a lot of good knowledge from you. thanks
Secondary Heat Exchanger also acts the same as the Evaporator coil and gets dirty with air moving throught it, Please dont leave a door switch taped closed because its a safety. Great video !!!!!
Thank you for your advice, for your help. No it's not too hot just in the exhaust side I thought it was for the new gas valve because in the package there are some little parts also I included like springs, but maybe it's for other different gas like propane. But the pressure looks okay so I thought it's already set to 3.5 w.c. Thank you so much for all your videos and your help.
Yeah, those extra parts are to convert the gas valve for LP. Glad I was able to help, stay warm!
I had spent two years and hundreds if not thousands of dollars trying to get repairmen to fix my furnace. I watched one of your videos and fixed it myself for 140 dollars (new control board with flame sensor). Thanks for the help!
Lorenzo.. a one wire flame sensor unless ceramic is cracked or damaged, they never fail..just get dirty with oxide build up. Just carefully clean the rod with fine sandpaper and replace.
Thanks for the flashlight. Way more utility that the ones I'd been using.
Great videos. Thank you!
Very informative, just shows how endless the possibilities are, each point you made has "sub points" to boot..that's why we get paid the big bucks 👍
Thanks so much! Turns out my limit switch is the button type, and there's a reset button right in the middle. I pushed it a couple times, put the covers back on, and it fired up again just fine. It's been about 12 hours, so hopefully it was just a one-of. Thanks again!
You're welcome! I hope it will work just fine from now on but just in case, if it happens again, the switch you were talking about is actually called a flame rollout switch and it is not the same thing as a high limit switch. There may be a bigger issue in the background. ua-cam.com/video/VAHSmeTTKpI/v-deo.html
You are my superstar and hero . This video help me a lot.
Thanks June! :)
Wow! I'm so impressed how knowledgeable you are. Should most technicians be able to come into our home and figure out why our furnace is overheating? We have had two different companies come out to try to fix it, and it is still overheating. The one guy shorted out the board when he was here. Ugh. Anyway, do you by any chance live close enough to Pottstown, PA so we can hire YOU to come and fix it right? As a person completely ignorant to this type of thing, the only thing we are comfortable doing ourselves is changing the filter and the thermostat. Thanks!
Informative video. Would you consider making a video describing how to properly clean an A coil?
I might make one later, when I clean mine. They can be a pain to get to since it's best to clean it from underneath. In fact the company I work for now, we don't even do A-coil cleaning to avoid the hassle. We just tell the customer to call a duct cleaning company to clean it for them.
Very good explained, thank you. What cause that overheat sensor to not coming back to normal after the temperature goes down? Only if I turn off/on the power it will get back to normal and start heating the house.
Thank you, I love your video.
Love your videos they are so helpful. I have had a trane xb 80 furnace for 12 years, or since we bought this house. It has always overheated. Only adding vents and using fiberglass filters helped. Anyhow it is a down draft and there are five 6" pipes in the plentium. I was told, that is not enough and is causing the problem. Does that seem right to you. Also the house is two stories and on a concrete slab
Very helpful. Thanks!
Thanks for the enthusiastic and knowledgeable video. Replaced the board, the inducer motor with a used one, and now the HVAC person wants to replace the heat exchanger based on components getting physically hot to the touch. To check for restricted vents, could I remove the filter for a short period of time? After 12 plus years is just getting a new furnace the best bet?
Outstanding host. Outstanding video!!! What an incredible amount of great knowledge you display. Thank you!!! SUBSCRIBED! SUBSCRIBED! SUBSCRIBED!
thank you about your video it solve my problem my heater did hot enough to the room the problem was no air returned enough needs return air.
Awesome awesome info. Thank you very much.
Great video!
High efficiency filters typically also have more pleats. The true test is the pressure drop chart on the furnace filter cut sheet. MERV is the only real standardized filter efficiency rating and I would never use anything lower than MERV 8 in your home.
If you have allergies I would highly recommend a MERV 13.
A MERV 13 will filter out smaller allergens as well as smoke, lead dust, bacteria and some viruses. I also do recommend installing a thicker filter housing such as a 16”x25”x4” that takes standardized sized filters. Some name brand filter housings only take proprietary sized filters. And if you have any HVAC buddies they can get you the premium MERV 13 rated filters for the same price as the MERV 8 filters you get at the store. I personally like the AirGuard DP-Green 13 filters because they have a low pressure drop, have excellent efficiency, and have cardboard pleat stabilizers to maximize surface area. Also I would say if you don’t run a pet grooming business out of your home changing your filter every month is a bit excessive.
I live in a doublewide and am having a problem with the furnace overheating and shutting down. The Honeywell starts blinking green every second to reset it. I checked my blower and it is spinning fine but it is covered in dust. I watched your video on how to clean it and know what I'll be doing really really soon and hope that it takes care of my problem. Thanks for your informative and well explained videos!!!! Rick
Did cleaning the unit fix the issues?
Just had to look for ac tech videos nd your número uno brother thank you very much the best!!!
was helpful!!, got mine working
Love your videos. 👍
As an electrical engineer, I learn a lot from your channel about HVAC. Is it possible that you can make a video of how to clean the dirty A coil by removing the blower motor and cleaning from the under. I only found videos of cleaning the A coil by removing the cover of the coil. The cover of A coil is sometimes hardly to take out. Thanks and Keep up the good work.
Thank you for sharing!
I talked to the service office person this morning about the condensate trap probably need cleaning. They sent out 2 different service techs this time to get fresh eyes on the issue. They cleaned out the condensate trap and found some stink bugs in there. The system is working after that. The service office person told me there probably more bugs fell in the trap since they other tech spent 2 minutes vacuum the top of the exhaust hole on Monday. I think they tried to frame us for another $100 cleaning fee plus additional diagnostic charge for today. I will find out for sure tomorrow the final bill. You're right about the condensate trap. If the tech had cleaned it out like he should on Monday, the issue probably would have been taken care off then and my family didn't have to spend last few days without heat; the inducer motor and the pressure switch might not need to be replaced either if the first tech did the job right. Anyway, we now have heat. Thank you providing feedback last few days. Your videos provide a lot of useful info and help me diagnose the problem, more helpful than the real life tech for sure.
Sorry to hear about your bad experience but I'm glad the furnace is back up and running again! Thank you for coming back with an update! Stay warm!
Awsome thank you for sharing!
Thanks man; God bless you
Great video.
Great video! Mine was tripping due to dirty 2nd stage heat exchanger and A coil. Where is you video on checking the control board and blower motor? Thanks!
You are the best in my opinion.
I appreciate that opinion! :) Thank you!
Another good lesson learned. Thank you.
You can turn a box fan into an air-scrubber by taping a high end furnace filter to it. I have 3 of them I use every now and then to purify the air. It doesn't build up mold inside like the enclosed air purifiers can do.
Totally Awesome Thank you so much
Hi, thank you for your awesome videos! I am having issues with overheating inducer motor, do you have any trouble shooting for that? And how do you clean the coil?
I would also check the blower speed setting, providing you're dealing with a variable speed blower.
Is there a recommended location to check the leaving air temperature in the supply when taking temperature rise calculations? I would suspect moving the thermometer few inches up and down will give different results. Thanks for your videos.
Takes readings from the front or sides of the intake and return, take the highest of the two numbers and subtract them, when you do that look at your service panel it will tell you what the glide should be.
awesome video