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Can you give me model on furnace? Most furnaces have a small vent motor that has to come on and pull a vacuum on the switch.Sounds like that motor may be bad if you hear a hum
Does this little motor come on or is that where the hum seems to be coming from?
If you have a volt meter lets check to see if we get 120v to this motor.Nothing else can happen until it does.
OK Either onr of two things is going on.
1. The board is bad, not signaling combustion motor to come on
2.Combutsion motor is stuck or defective
If you have further questions, please let me know.
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