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

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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!

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

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

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

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

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...

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!

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

Excellent video on troubleshooting why the air handler fan continues to run. My issue was the sequencer and didn't realize it. I had unplugged that connector since it also had wiring for the strip heater which I don't use so that's why I unplugged it. When I plugged the connector back in the board, the fan started working correctly. Self inflicted but lesson learned. Thanks for sharing your HVAC knowledge.

Thank you for being so precise and sharing your expertise!

One of the greatest resources for techs new in the trade. Especially on long drives

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.

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

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!

Thanks for this amazing video! What about if the humidity doesn't go away? What could be causing that?

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

Thanks so much for making this video. Was the green wire for me LOL I never knew it had such an important role in the air conditioning system. Boggled me for like 3 or 4 hours

Hey Craig, can you make some live service call videos showing your steps of troubleshooting? 😁

Great and helpful video man, I appreciate the info you provided, thanks a lot.