Learning, Sharing, and Teaching > Do it Yourself Discussion!
HVAC Issue with electrical burning smell
chops:
We have a 1995 G20 Lennox Whisper Heat HVAC unit, lived in the house for 2 years, worked fine since we moved in. We don't use the central air often, (We're big fans of the fans!) but our premie newborn came home from the NICU this week and we were told we should keep it cooler for him so I turned on the HVAC central air...and I got nothing. No air movement from the HVAC blower fan, just a buzzing sound. Also an odd burning smell (electrical-ish?) was evident around the inside hvac unit. The outside unit was spinning fine.
I looked up some common issues and it seemed that the capacitor or the transformer can cause these symptoms so I replaced them both. Now if I turn on the HVAC A/C I still get the buzzing sound and no air flow...BUT if I push the blower fan with a pen it will start up and work fine. No burning smell anymore. I am now thinking it is a control panel issue so I looked at that best I could but couldn't see any burned marks on it which I read usually indicates an issue.
Any thoughts?
Thanks!
- Chops
BlueMR2:
Sounds like a failed blower motor to me.
chops:
Thanks BlueMR2 - so you are thinking it could be a failed blower motor even though it works fine after I give it a helping push with a pen?
GuitarBrian:
Sounds like a bad blower motor. Or capacitor.
Don't let the motor overheat.
I think you have a 60L21 blower motor. (Quick Google search YMMV)
Look up your model number and learn how to test the Capacitor and wiring. Sometimes there isn't info specific to your unit, so try Lennox air handler blower motor test or something like that.
If both check out... Cap is within 10% and wiring is showing good voltage. Then replace the motor.
BlueMR2:
--- Quote from: chops on August 22, 2017, 07:46:11 PM ---Thanks BlueMR2 - so you are thinking it could be a failed blower motor even though it works fine after I give it a helping push with a pen?
--- End quote ---
That's how my blower motor failed. It couldn't start anymore on its own, required a push start. When not able to run it'd sit there buzzing and generating an ozone smell. My ceiling fan died the same way too...
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