Air Handler Blower FAN WON'T TURN OFF! 5 Reasons Why it Keeps Running!

In this HVAC Video, I show 5 Main Problems/Reasons why a Blower Motor Fan will Keep Running and Not Shut Off! I use a multimeter to measure the resistance across contacts and for voltage at the terminals of the control board along with other tips on what the problem could be! Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.

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Information in this video is intended for educational purposes only. Any work related to the topics in this video should be performed by licensed technicians or by apprentices under the supervision of licensed technicians. AC Service Tech LLC is not responsible for any possible damages or injuries caused by the use or misuse of any information provided. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
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[notarivsanonymvs]

Thank you! You’re such a great teacher that provides great detail on how and why things work or don’t. I watched over 4 hours of video for my issue and by watching your video my case was the first problem you mentioned, a bad thermostat! Of the videos I watched no one mentioned it. I’m glad I didn’t order a new control panel at $230. I ran to hardware store this morning snd bought a $39 thermostat controller and we’re back in business. My visitors are now all warm and cozy! Thank you again Sir!

[bluebeastgamer]

Excellent
You are the best instructor/teacher I have ever seen in YouTube. You are much much better than my hvac school teacher!!!!

[curtmatthews]

Great Video! I pulled my Thermostat and the fan stopped running. Replaced the thermostat with new one and viola! Everything back to normal. Thank you so much.

[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!

[jazzeteria]

Ac service Tech LLC.: thanks for your videos, it helped me a lot. I followed the 5 causes your recommended , I could fix my problem (package unit) once again, , thanks for sharing your knowledge...

[houstonsbestairheat]

I had that problem today. The blower would just run. But the problem was a burned transformer. Changed out the transformer and blower stopped running checked system in both heating and cooling mode and now is working properly. Y’all videos are great

[diegoyankelevich]

Excellent video! As a teacher of electrical engineering, if I were a student, this the type of lesson I would to receive!

[acservicetechchannel]

Follow and Like our page on Facebook to get unique content and updates posted every other day!!

[phatqt]

You just saved me a bunch of money. The thermostat is bad… I a forever grateful

[trulevel]

For anyone who might need this:

He says in the video that if you disconnect your thermostat and the blower, or handling unit, turns off then it’s a faulty thermostat but I don’t think that’s correct. When I removed my thermostat my blower kept running and would only stop when I opened the breaker for the furnace. He says in reason 5 that in this case it could be a faulty module.

In order to completely rule out the thermostat, you should disconnect your thermostat and pull the breaker to get the blower to stop running. Close your circuit breaker and see if your blower comes on. If it does the problem is not your thermostat. If it doesn’t than the problem is your thermostat.

I did this and narrowed the problem down to the thermostat, which I replaced, and the problem went away. It must have been internally shorted.

Overall this video is very good. I couldn’t have figured this problem out without it. Thank you!

[peanutbutter]

Thank god I found your video! I’m house sitting and it’s 3am and the fan on the unit keeps running So I took the circuit breaker out of the outside unit and it still ran! I can’t find the inside breaker box anywhere!🤷🏼‍♀️ so I pulled the thermostat off the wall and the fan finally stopped! Was so afraid to go to sleep Incase the fan burned up and caught something on fire! Thank you for your videos! Now off to sleep! 🤦‍♀️

[evwizard]

This was very useful, the only bad thing is, i dont think i wanna mess with any of it but at least when the tech comes ik whats going on. Thanks!

[MTBSelfieStickGuy]

Wow, if only every diy youtube video was this good. hats off to you!

[johntucker]

Thanks for this video, zeroed in on the contactor/sequencer being the issue, replaced for 20$. I have hvac system working properly now.

[joeriver]

Great explanations, thanks for sharing your knowledge and time, blessings to you and your family!

[zgxbl]

another very informative video, the best HVAC channel!

[cindykirby]

This was too hard for me to understand. But you answered my query should my blower run all the time. So I will call my guy. Thanks.

[russellsimms]

Nice video. Okay, suppose the blower is NOT blowing when it's supposed to?
Twice, after overnight severe thunder storms here in Houston, the next morning the blowers on the AC units were not blowing. We have three 5-ton units. All three blowers ceased to function.
Everything else in the shop works. Everything! Including the 5-ton units outside the building. They come on, and they push cold air into the housing cavity. ( You can easily feel the cold air when you remove the air filters) But.. the blowers do not come on and blow the cold air into the shop.
This is the second time in 3-4 weeks that this has happened. After the first time, the AC crew replaced those blowers.
This time, we can't get them to come back for service.
We've been without AC for 7 weeks now.
I do know that there are no surge protectors anywhere inside nor outside any of the three units.
What would cause "all three" blowers to go out after a severe thunderstorm?
Just seems so odd.
Thanks!
Hot and Sweaty

By the way, those three AC units were installed 1 year ago almost to the date.

[nikkid]

Thank you for being so precise and sharing your expertise!