I have an issue with my HVAC system. It is gas heat. The initial fan comes on, the flame lights and burns properly but the fan blower does not come on. I just hear a humming noise. Also if I just turn the fan to the "on" position, I hear the same noise. I have tried 3 capacitors and did not fix the problem. I am wondering if it is the fan motor.
Can you tell me part numbers and where to find a fan motor.

Thank you.