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Tim H.
Tim H., HVAC Professional
Category: HVAC
Satisfied Customers: 3069
Experience:  Experienced in all aspects of HVAC, both residential and commercial.
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my blower does not come on all other components seem to be

Resolved Question:

my blower does not come on all other components seem to be working fine pilot light ignites furnace gets warm but blower will not kick on
Submitted: 8 months ago.
Category: HVAC
Expert:  Tim H. replied 8 months ago.

Tim H. :

Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Thanks for the opportunity to help!

Tim H. :

Hello there

Tim H. :

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?

Customer:

no i do not

Tim H. :

OK, that will make things more difficult to confirm. Have you tried reaching in and spinning the blower wheel by hand?

Customer:

Yes took blower off cleaned and put back in seems to be spinning fine

Tim H. :

OK, did the motor seem hot after trying to make it work?

Customer:

no it stays cold the furnace gets hot but blower does not kick on

Tim H. :

I mean after furnace heats up and when blower would normally kick on, does it feel hot to the touch?

Customer:

no blower does not warm up to the touch

Tim H. :

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.

Customer:

can i take the blower motor out and have it tested to see if the blower is bad

Tim H. :

You could. Or just apply 120 volts to the white lead and the red lead.

Tim H. :

What color leads do you have on this blower?

Customer:

let me check

Tim H. :

OK

Customer:

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

Tim H. :

ok-so the white should be the neutral

Customer:

yes it is plugged into neutral on the board

Tim H. :

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

Customer:

how do i apply 120 volts to it

Tim H. :

You could use an old extension cord or something. Just make sure that you have neutral to neutral and hot to red

Tim H. :

Having a voltmeter would make it much easier

Customer:

ok i have an old extension cord which is the neutral end

Tim H. :

If you are plugging it into a standard outlet, the shorter slot is the hot, the longer one the neutral.

Tim H. :

I will be logging off soon, but if you want to test the blower and get back to me, that wold be great.

Customer:

give me a few minutes going to test now

Tim H. :

OK

Customer:

the blower worked it is not the blower

Tim H. :

OK, great! That would seem to indicate a bad board, then

Customer:

the whole board itself

Tim H. :

Yes

Customer:

the fuse on the board is fine ive already checked

Tim H. :

Yeah, not the fuse. There is a small relay on the board that sends power to the blower-probably shot. Boards are not repairable

Customer:

ok thank you ill check around for a new board

Tim H. :

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.

Tim H., HVAC Professional
Category: HVAC
Satisfied Customers: 3069
Experience: Experienced in all aspects of HVAC, both residential and commercial.
Tim H. and 2 other HVAC Specialists are ready to help you

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