Indoor Fan Keeps Running - 10 Reasons Why

Indoor fan keeps running. Does your indoor furnace or air handler fan keep running and wont shut off? In this video I go over 10 reasons that can cause the blower motor to keep running and not turn off even when the air conditioner and furnace are set to off on the thermostat. Here are the 10 reasons I go over in the video:
1. Thermostat fan setting is set to ON
2. Blown 3 amp fuse
3. High limit stuck open
4. Flame rollout tripped
5. Low pressure gas switch open
6. Old fan limit control bad or set wrong
7. Bed thermostat
8. Shorted wires
9. Bad control board (fan relay stuck closed)
10. Extreme temps outside or other problems
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This video is for educational purposes. All appliance and HVAC repair work should be done by a trained professional. Word of Advice TV is not responsible for any possible damages or injuries caused by the use or misuse of the provided information.
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#wordofadvicetv #furnace #heating #hvac #airconditioner #airconditioning

[@randydavidson7969]

By far best video I have seen. Made it very easy to understand…

[@marciniakcrystal]

😊😊

[@johncobb2246]

Nice video thanks

[@mikesakellarides3463]

He diagnosed my problem at 3:56. A stuck limit switch which opened when I tapped on the panel with a flashlight. THANK YOU!

[@WordofAdviceTV]

I'm happy to hear you were able to get your furnace fixed quick! :) Thank you for leaving a comment, stay warm!

[@davidbillings3105]

Are you talking about a high limit switch that will not allow the heater to work? I've had limit switches go bad but the blower still worked amd shut off with no problem Of in heat mode it will not shut off because the house will not warm up so the thermostat can kill tje blower.

[@kevinwmorton]

Spent all day trying to figure this out. Bought a new thermostat and everything. Finally watched this video, went and gave the switch a tap and it worked. Thank you

[@TrongNguyen-ky6wy]

I’ve narrowed down to the relay board, and unplugged and reseated the connections and it worked to stop the fan from remaining on. But after turning heat on and then off, the blower fan resumed its problem again :( . The only way to get the fan to operate normally is in heater mode which it will shut off automatically after temperature is reached. Any insights will be appreciated.

[@ezdoesit20]

Super informational video... I have one for you. Everything was running perfectly. Fan turns on and off with the ac or heat. This was with the original emerson thermostat. I installed a nest. I connected common wire to board in the unit. I hooked everything up as the manual said. And now the nest will not control the fan. The fan runs constantly. Everything else works. I then removed the nest and re installed the old thermostat and everything was good again. Any ideas?

[@texx2g3]

Just watched your video and five minutes later everything is fixed and working, you just saved me a ton of money by switching to KZbin😂😂 Awesome video and thank you so much!!

[@robertgarcia4117]

From Steve. I learned a lot from you. Thank you. I got my fan to stop. I took my thermostat cover off, I put it back on, and my fan stopped. Thanks 😊

[@dpuetz]

I have watched a lot of self-help uTube videos, I am a handy guy, but this video and this guy are the best I have watched. Very understandable, very safe advice, and thorough. Thank you Sir !!

[@TheHawgfarmer]

This guy is amazing to say the least. So many times I have watched these videos hoping to find solutions an never any luck. But this guy? If.he didn't cover your problem U would say, you need a new furna. He is thorough without being a bore. Informative and doesnt leave you thi king, C'mon man, get to the point. Y like others I would say e everything he says tou need to hear. No rambling.and.he gets right to the point. No process elimination and definitely no guesswork. I will say it one more time, If he didn't offer you the needed advice and the simple.way to fix it? You need a new furnace. Thank you so very much. I feel like I have been fully trained in furnace repair. I could.go in to business with just this video. Amazing knowledge and free of charge. I feel like I should pay him for his knowledge. I would say I would like to see more videos from.this guy on this topic but I honestly think he covered everything I could possibly need. Tha k you again and God bless you for sharing you knowledge and expertise in this field. JUST WOW!!!

[@Chow_Yun_Matt]

Agreed, I watched about 20 other videos trying to solve my problem before I came across this one. Subscribed, and will be my first go-to in the future!

[@gman13glpz]

Thank sir. You just saved me $100.00 for a specialist visit plus labor work. It was my High Limit switch. I just hit it with the back of a screw driver and it worked. Thank you so much, God bless!

[@jamest3503]

Asking my tenant about number one saved me the trip. Ty.

[@karennimeh1125]

Thank you for sharing. I do have indoor fan keep running 24/7. I have to call electrician ASAP to taking care of this pro for me.

[@tsmgguy]

Had fan stuck on high, Goodman 3 ton system, Honeywell 8000 thermostat. Tech visit no help as a new control board not available and backordered for at least a month. Was concerned about high electrical draw and fan lasting that long. 8000 installer set-up booklet details how to do a system reset to original factory settings. Did this, and it fixed the problem. Try this first.

[@saldore6884]

Thank you. The way you explain n speak n show makes everything so easier. Blessd. Other people charge aloud just to diagnose. You make it free n allow us to know and do our selfs. THANK YOU SO MUCH. THANK YOU FROM MY FAMILY KODS N WIFE FOR THESE VIDEOS. Just to note : had some diagnose n conclude it was the board. Yes worked right after. But the bill was over $1200 bucks. So thank you again. DYS STYLE. BLESSED

[@la-gl4uh]

I wish you were in my city. I've had 2 different companies come out to solve the fan running problem. Neither of them did any of the troubleshooting that you described. Instead they said i need a new HVAC system to the tune of $7K . My system works fine heating and cooling except the fan keeps running. My system is well maintained, not rusty and worn out. I'm going to do your troubleshooting steps myself and will put the results here. I've already replaced the bad blowr fan motor myself and replaced the condensor fan motor myself. I know I can do this troubleshooting. Thanks. You're the greatest!

[@WordofAdviceTV]

Sorry to hear about the furnace.. Unfortunately there are plenty of companies that would rather sell you a new unit than fix your existing one.. Good luck with troubleshooting! Hopefully your culprit will be one of the 10 I list.

[@timd1833]

ANY UPDATE???????

[@Holpopov]

My G wire and Red wire were not insulated and were close to each other but not touching. I insulated both and problem resolved. You saved me lots of money. It does not surprise me that you are willing to help others. I love Greek people and food!

[@nrraab]

Great video! House was getting down toward 60 degrees and was wondering if we would have heat tonight. Found out my rollout switch was tripped. It's working now. tomorrow I will check the intake and exhaust, but the key is we aren't going to suffer tonight. Thank you!

[@kyle998cc]

Thank you! I pressed the flame rollout switch button reset and the furnace worked properly again.

[@WordofAdviceTV]

You're welcome! If the flamerollout switch trips again I would suggest watching my flamerollout video as something more serious may be going on. (Such as a cracked heat exchanger)

[@gonnadanceagain]

Getting ready to try some of what I've learned. You are a very good teacher.

[@myutubehandle47]

Smart and charismatic, a people person with good teaching skills!

[@whatintheworld4798]

Mine was the high limit stuck open and tapping it with a screwdriver did work. Thank you!

[@gamewizardks]

Great video. Ran into a fan relay on an electric furnace that was sticking and I replaced it. That call made me interested in watching some videos on the subject. Thanks again for the great content! You and AC Service Tech are my favorite service channels!

[@equisequis.55]

this is the best video. very down to the detail. thanks so much. i just saved hundreds of dollars. as of Hvac guys are very expensive. they charge over a hundred dollars just to come out and then some more after they fix it.

[@abbasnamavar4885]

This video was very helpful for my furnace fan issue

[@edl6140]

You are just amazing!! You video just help to resolve my 'Stuck High Limit Switch" problem on my furnace!!

[@laca4234]

A shorted ECM blower may run non stop as well. I have a nice $40 Supco tool for testing ECM blowers. Thanks for your videos.

[@bigstepper2235]

Another reason could be the limit could be actually touching the heat exchange, probably not but possible. Love your videos man i learn a lot from you

[@martinarias2864]

Thanks for being so good teacher

[@Tommybucketssssss]

Thanks for the tubetorial! Going to grab my multimeter and I'll let you know what happens but great vid and info. The camera work is great and easy to follow you.

[@Tommybucketssssss]

Fried motherboard. Got a new one in myself and running great for several winter months. $125 and done.. thanks!

[@MariieeAna]

Thanks to you I fixed my ac! Thank you so much for your knowledge ! Keep the videos up

[@Rize_Inn]

My furnace is so old it looks a lot different from yours on the inside. But my fan will shut off if I give the furnace a wack in a certain place on the side. But this video was still helpful in giving me ideas of what could be wrong. Thanks.

[@shawngoben2545]

He does a wonderful job! He asked to leave a comment if we ran into something he may not have covered so apparently when I hooked up a new thermostat to our furnace there was a blue wire and it was supposed to go where the yellow is and with it being switched around the fan would constantly run unless you pulled the thermostat off the wall then it would stop it took me quite a bit to figure out that i simply put the blue in the b slot when it should have been in the y slot but that seemed to be the trouble

[@1109336]

Literally the auto switch killed me for days thank u so much💯

[@jerryjones6675]

Great video, very concise and well explained.

[@hochoi1873]

This word of Advice TV has helped me on understanding how to fix my furnace problem like flame off right after igniting. So I did flame sensor and burner surface cleaning. And I found my old thermostat was causing another problem so I had bought new thermostat of Emerson. I did wiring per Emerson's guide and at first it seemed to be working OK. But later I found out the air blow kept coming even after the room temperature reached the target temperature. And checked the Furnace with error code of "Flame sensed with the gas valve off". I would appreciate your advice on this. Thank you

[@brianchristle1431]

Watched alot of your videos ended up being a stuck limit switch thank you.

[@WordofAdviceTV]

Glad to hear you were able to narrow it down and find the problem! Stay warm!

[@manuelsarmiento539]

Thanks for all your videos, always I learn something,you explain very clear, congrats 👍

[@debrajeanyates6169]

You really helped me troubleshoot my furnace problem. Thanks!

[@pennyuyitung4854]

Much appreciated on the tips - Very helpful and well explained on the possible things to check. I know you said the reasons were not in order - but if you were ever to edit/re-shoot - do the codes first before the other checks. btw - enjoyed your talk in the end. Your presentation is good.

[@hurts8732]

Hi, fired up my heater a few days ago, having this issue where the fan doesn't shut off. I ruled out thermostat already I think, I will be installing new high limit switch tomorrow and go from there. My unit is a Bryant from 1987, just wanna get past this winter and have a complete heating and cooling system installed next March or so. I really appreciate your advise, sharing you knowledge and taking the time to make a great video!! New sub here.

[@ezmoney6341]

Thanx a ton for the video helped me fix my furnace.

[@vilmaacord1175]

The most complet common sense explenetion👍👍👍

[@freddyrodriguez6305]

Your delivery is excellent Thank you. Gave me 2 options to troubleshoot safely. Regards

[@Holpopov]

You have no idea how much I appreciate you making this video and sharing valuable information.

[@ScottKauffman-zk9wl]

Bro life saver you rock man .

[@bettyfletcher3738]

Your lessons are AWESOME! Easy to follow. Thanks!

[@natalyalelyukh5568]

Easy to follow and understand great video 👍

[@HermosaJammer]

Absolutely awesome info! Your my go too for all HVAC and home repairs. Your delivery always has a sequence of operation that is easy, understandable and always educational. No way I would tackle or feel confident on the home repairs that I’ve done without your help. Keep up the great work and look forward to more videos!

[@WordofAdviceTV]

I'm happy to hear that my videos have been helpful! Thank you for watching and leaving a comment!

[@honkaylau1525]

Good job. Excellent explanation. Thank you.

[@kcmgfarm2389]

Man, this was an excellent video. I know nothing about air conditioning or air handlers but I could follow along easily. I know you are teaching via You Tube and it's very much appreciated.

[@ThanhPham-hn1rq]

Made it very easy to understand…

[@lorrainechapman6940]

That is a lot of useful information thank you we are having that issue with her older blower wheel I think it's what they call it.. when it's very very hot outside the fan inside does not want to stop and I did check the thermostat it is set to auto we have had a service man here twice he has checked the unit out and gave a list of many things could possibly be wrong.

[@frankhopkins5165]

How you can make this so simple and straight forward is absolutely amazing! Great job and THANK YOU!

[@winip9261]

What an amazing video this is. Thank you so much for this.

[@missmaryam143]

Outstanding video!!!! Thank you!

[@pantherschick42]

Solved my problem and I know absolutely nothing about heating and air. Thanks

[@betoprieto08]

Purple markings...specially at parks mean reclaimed /recycled water-not potable-mainly used for irrigation

[@lisawilson6243]

Your videos are very well made and informative! I would love to see some about fixing and troubleshooting heat pumps .

[@4uXavier]

When switch it in ON mode . I am getting hot air and fan runs and automatically both heater and fan gets off when room temperature goes high .then automatically switches on .. My control system is manual .. When I change the switch to off mode .. the heater gets Off but the fan continues RUNS.. What is the problem?

[@guillermosanchez7837]

Good information Thank you for sharing

[@harvestmaid5669]

🤗will check it out.... (67 yr. old lady) no man..lol. thank you so much.

[@teebob21]

This video saved me a $300 service call in the middle of an ice storm. I have a 30+ year old propane furnace that had a stuck limit relay...fixed with a little percussive maintenance!

[@not2muckinfuch612]

Awesome Video!:) I'm going to diagnose it 1st thing in the morning! Keep up the awesome videos! Thanks so much!:)

[@odi1964]

This is what I'm looking for an HVAC technician, a detailed step by step diagnostic check. Unlike other tech guy who jumps to the circuit board as the main problem for a continuously running blower fan. Salute to you brother!

[@tedkobel5002]

Thanks for this video. I looked at about 4 others to find possible answers to my blower continuously running and checked all the things recommended. None worked for me. This video was the only one that mentioned the fan relay and rapping gently on it to loosen a possibly stuck contact. Sure enough, that was my problem. All is well now. I'll be looking to find a replacement relay. Meanwhile, if it sticks again, I know what to do. This young man is the best!!

[@devontreasure3657]

Awesome video! It really helps me a lot. Thanks keep up the good work.

[@berniewain2814]

You are the best! So smart and clear.

[@shaneswift7501]

THANK YOU for posting this video, followed step by step and discovered it was a stuck relay on the MB. There is NO WAY I could have narrowed it down without your video, you saved me time, you saved me money, and now I know where the problem is I can grab a new MB and be ready in case it becomes a more common issue. If this video helped anyone you owe it to this guy to subscribe and use his amazon link, I will be!! Not only was this amazingly helpful, there was not 20 adds to skip through.

[@nftcoin9899]

A quick question, just wonder if the black round thing is the spark ignition coil? And have you ever found any issues for this part and get it replaced? Where you can find this part ? Your videos are great thanks

[@svik65]

HI. Among HVAC videos, this is the best one. Thank you. Now the question: my furnace will run the fan continuously, but only every few days. Opening the door of the furnace will fix it (as it shuts power) and then it will work until the next episode. Mostly in the morning... Any suggestion?

[@chrisl.johnston6622]

As the other comments have said " very professional" ! 👍

[@paulgonzato2709]

Another to add to your list. I had a mid efficient furnace (Carrier) with the blower fan running all the time. Turned out there was a loss of power (power outage) and because the thermostat was calling for heat when the power came back on it the board wouldn't reset. I needed to turn off power to the furnace and then turn off the thermostat (lower temp) and then turn power back on and then raise thermostat. All worked.

[@canzhu6326]

I love your lessons, the way you teach I understand. Excellent Job

[@KevinSoupy]

Thank you

[@keithnoneya]

Awesome video. Absolutely the best I've seen. You should do a course or something. Thanks for helping me, I get to sleep in AC tonight. Best Wishes & Blessings. Keith Noneya

[@patriceolu]

Thank you

[@Sparky_Roddy]

Skip all of the other furnace blower troubleshooting videos and go straight to this one, thank you!!

[@kentcan]

I'd like to add one more! Well, it's really a variation of #8 (Shorted Wires), but my symptoms were not exactly as he described so I'll tell you what I discovered. I'm a home DIYer, and after watching this video I was still stuck, so I called my local HVAC guy. He helped me trouble-shoot over the phone, and here's what we found. CONDITIONS: All-electric furnace (heat pump) and a/c unit. Fan set on Auto, Thermostat control (Cool, Off, Heat) set on OFF! SYMPTOMS: Furnace blower came on in the middle of the night (freaky!). TESTS: Completed all of the tests in the video that pertain to my all-electric unit. I unplugged the motor wire from my control board so that I could listen to the relay switch without the fan actually turning on and off. Every time I flipped the shut-off breaker for the furnace I could hear the relay, so I knew my relay was opening and closing, but that meant it closed any time there was power to the board. So something was calling for power from the R wire. One by one, I started disconnecting wires from the control board until I discovered the Y wire (a/c cooling unit) was the culprit. Here's where I got stuck because I couldn't find anything online that mentioned this. So I called my HVAC guy and he said this meant my Y wire had shorted out somehow to the R wire or another source of power. He said this was probably at the outside unit and suggested it was likely either the Defrost Control Board or rodents. Yes....mice. :) RESULTS: So I went outside and pulled the cover off the a/c unit and--sure enough--there was a lovely large MOUSE NEST built in between all the wire connections! As I cleaned it out she scurried away...then I found the babies. I've got pictures--send me a message if you want to see them. :) So this explains the sudden fan activation in the middle of the night. Momma Mouse had chewed extensively on each of the wires, creating a massive mess. So I cleaned it out, plugged the mouse's access hole, stripped and reconnected all the wires, and I'm back in business!

[@ivanhoe6145]

Thank you!

[@vedvern]

Thank you! Spent a couple of weeks trying to figure this out and your video helped me fix the problem!

[@frquentc3289]

Do you have any instructional videos for indoor units that aren’t furnaces? Like regular air handlers

[@arthurjackson5430]

Very informative video explained very simply- even to those with no knowledge of the topic...(quick, precise, and actually kinda entertaining!) I was able to fix my problem with your help just a few minutes in! Keep up the good work!

[@ppriyank]

Awesome videos...random question...what could be a reason why air flow is stronger on 2nd floor, and next to nothing on main floor (central ac unit is installed in the attic). thanks for your guidance.

[@lisagabriel909]

Hi! I love your videos and was able to replace my capacitor recently because of your help! I was so proud! Recently I noticed that the fan isn't shutting off when it should and I have watched this video. Before I start poking around and troubleshooting, I was wondering - is there a flame rollout switch on an electric furnace? Or does that only apply to a gas unit? I have electric. Thanks again!

[@WordofAdviceTV]

Glad to hear you were able to get your unit fixed! You are right, your furnace will not have those. Since the electric furnace does not have flames, there is no need for a flame rollout switch. Good luck with the troubleshooting!

[@camerasncats]

Hello Lisa. I have the exact same issue with mine right now. I also recently replaced my capacitor and now my blower is stuck on. What ended up fixing yours?

[@myub40]

Thank you for the information...also you are funny - reason i subscribed

[@HJG-1019]

*WOW!!!!!* I am having this same problem and have looked up a zillion articles online and tons of videos on YT -- and *YOURS* by far is the *BEST!* The most informative, the easiest to understand (and the _most enjoyable_ - if l may call it that!) *Thanks for taking the time to share your knowledge and wisdom with us all!*

[@masonwang9051]

You said exactly what I want to say. I am still watching his other videos and learning, and hope he can consult online helping to solve my furnace problem, as I live in Boston

[@HsingSun]

@@masonwang9051 In Boston, you you need cooling?

[@marcelimarilag]

Just gonna put this out here it might help someone. Figured out none of this is the problem of my furnace but the nest thermostat I installed. So when you install a nest or smart thermostat and it has an airwave feature, by default it will be set to ON. Just turn it off and that should fix it. Good luck!

[@dhflannagan1]

The best! Great job. Your a pro! Thanks

[@GrahamBrannon]

Your tip on checking the high limit switch being stuck open by giving it a smack was exactly what my furnace needed! Thanks for the video!!

[@AdventureStop]

Still trying to figure out my issue. I'll power off my thermostat with "System Off" and the blower fan randomly turns on. I'll switch the FAN to ON, then back to AUTO, then the fan will shut off. After about 15 min, the same thing will happen again. With "System Off" no fans should be running or on. The system works fine otherwise. The heat blows hot, the AC blows cold. I replaced the thermostat, with a better Honeywell 9000 WiFi thermostat...and still the same thing. I paid a clueless HVAC guy to come out and he said "it's working fine, no problems." I can't have the blower turning on for 30 minutes on...15 minutes off constantly for 24 hours a day. So I just turn off the breaker when I'm not here. I have no clue and wasn't able to find it on your video?...

[@josegutierrez6640]

Great Video thanks for share mi amigo!!!

[@dellappin87]

One of the best teaching videos and teacher I have ever seen. Excellent, and I want to watch more, even if I don't need to. Thank you.

[@trancemaster420]

Thank u so much for ur help!!!

[@ltw1950]

I think this is a great video! Easy to understand and he is very personable, knowledgeable and knows what he's doing! Thanks for the help!

[@markt2202]

You are the best at explaining these things. Where can I find a high limit switch C340056P02?

[@davidjones-ju4vc]

ah honey he's such a good boy. thanks again

[@OranguBANG]

My father installed a new thermostat for Christmas for me and now it won't stop blowing. Would it cost a lot to get someone to check out wiring do you think? Thinking maybe something was installed wrong. The fan will go for hours after heat shuts off. Also worth mentioning it does not come back on after resetting it. But once heat is back it's back for hours regardless if I just hear 1 degrees. It was a 150 dollar smart honeywell thermostat :/

[@timc8913]

Very informative. Will check for these things on my furnace that won't seem to shut off. New Subscriber. Thks.

[@Fedgery007]

I just installed a new thermostat and everything works fine except the fan won’t stop running when cooling. I can change setting to heat and the fan turns off. But once I turn the cooling back on the fan starts up and doesn’t turn off. I can put the old thermostat back on and there are no issues. The control board and thermostat are both Honeywell.

[@MyTran-ir6wk]

I have the same issue, did you get it fixed?

[@MyTran-ir6wk]

If you got it fixed, would you mind sharing to me about what happened? I can't afford to call a technician now during this crazy time :(

[@dominiclacavera1963]

thx great video

[@devseepersaud6565]

I hope you check this message. I have an issue where not only is the fan running continuously, the heat (gun) is also continuously on. Any idea what might cause it ?

[@donpeacock6593]

Thanks for the great video, I still can't figure mine out. Carrier 9200 Nat Gas + Carrier thermostat. Fan runs in heat mode regardless of temperature. Fan in Auto. Air filter new. All elec tests done with Fluke 179 MM. No short between Red and Green. 3A fuse fine. Rollout (N/C) verified closed. Limit switch (N/C) verified. No Fault codes (LED Solid red). Heats fine, flame comes on/off fine and keeps house as desired. But the fan runs all the time. Off mode on Tstat stops fan. Setting temperature far below room temp and going to heat mode, fan kicks on immediately (cool air). Any hints to keep me from needing a service call would be great.

[@ezdoesit20]

Very informative video. I have a question. Everything was running perfectly. Fan goes off when it reaches temp. Then I installed a nest and the fan stayed on. It does not turn off. No matter what so then I re installed the old emerson thermostat and everything worked again. Any ideas?

[@juanmarte6284]

Yuo sre a real teacher

[@lesterwesner6977]

Your a good teacher. Explains very well.