How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Dan Linger Your Own Question
Dan Linger
Dan Linger, Lead Technician / Energy Consultant
Category: HVAC
Satisfied Customers: 62
Experience:  16 years of experience. Factory trained by American Standard, Bryant, Carrier, Rheem, Ruud & others
Type Your HVAC Question Here...
Dan Linger is online now
A new question is answered every 9 seconds

Furnace fan runs, but stops shortly after

This answer was rated:

Furnace fan runs, but stops shortly after

If the furnace fan runs for a short time then stops, it sounds like the bearing might be seizing up.


Upon start up, a motor with a bad capacitor will hum but not start. If you manually start it, it will typically run until you turn off the electricity to it. Then on the next start up it will just hum again.


I would replace the capacitor first and see if that resolves the problem. Capacitors are much cheaper than a new motor and you will need to replace the capacitor anyway if you replace the motor (that is the motor manufacturers recommendation).


So, replace the capacitor first. If the same symptoms occur, replace the motor as well. Then all will be good.


Good luck. Let me know your results.


Please ACCEPT this answer if it is helpful.


Thanks, Dan

Dan Linger and other HVAC Specialists are ready to help you
Customer: replied 6 years ago.
That was my hypothesis or more like my SWAG - stupid, wild-ass guess! That sounds logical and like the path I'll follow. Thanks very much!

You are very welcome.


Sincerely, Dan

Related HVAC Questions