HVAC Questions? Ask an HVAC Expert for Answers ASAP
Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Thanks for the opportunity to help!
I'm sorry you are having trouble with your furnace. Most likely you have a bad blower motor, but I'd like to have you perform a check. Do you have a voltmeter?
no i do not
OK, that will make things more difficult to confirm. Have you tried reaching in and spinning the blower wheel by hand?
Yes took blower off cleaned and put back in seems to be spinning fine
OK, did the motor seem hot after trying to make it work?
no it stays cold the furnace gets hot but blower does not kick on
I mean after furnace heats up and when blower would normally kick on, does it feel hot to the touch?
no blower does not warm up to the touch
OK, well there are 2 possibilities: a bad board or a bad blower motor. Without voltage readings, I can't say for sure which it is. If motor were getting 120 volts and didn't come on, I'd say-replace the motor. But if no voltage, then the board would be suspect.
can i take the blower motor out and have it tested to see if the blower is bad
You could. Or just apply 120 volts to the white lead and the red lead.
What color leads do you have on this blower?
let me check
ok the blower has a black cord that plugs into a connector the connector has a red, white, brown, and black coming out and plugging into the pc board
ok-so the white should be the neutral
yes it is plugged into neutral on the board
So if you were to apply 120 volts to the neutral and the red lead and blower runs, you can safely say blower is probably OK
how do i apply 120 volts to it
You could use an old extension cord or something. Just make sure that you have neutral to neutral and hot to red
Having a voltmeter would make it much easier
ok i have an old extension cord which is the neutral end
If you are plugging it into a standard outlet, the shorter slot is the hot, the longer one the neutral.
I will be logging off soon, but if you want to test the blower and get back to me, that wold be great.
give me a few minutes going to test now
the blower worked it is not the blower
OK, great! That would seem to indicate a bad board, then
the whole board itself
the fuse on the board is fine ive already checked
Yeah, not the fuse. There is a small relay on the board that sends power to the blower-probably shot. Boards are not repairable
ok thank you ill check around for a new board
No problem. Good luck! Thanks for using Just Answer and please don't forget to rate my service. (bonuses are always appreciated) Follow up questions are always welcome.