Draft? fan pluses several times before furnace fires up

Old 01-21-13, 05:15 PM
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Draft? fan pluses several times before furnace fires up

I have a Goodman GMNT Gas furnace. When it is starting up, the fan motor starts and runs for 5-10 seconds, then turns off. After a few seconds, it comes on again. After a few cycles, the furnace finally ignites.

Should I Be concerned? Itís been doing this for some time now. I would appreciate ideas on how to troubleshoot the problem.
Old 01-21-13, 10:08 PM
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By fan motor do you mean the draft inducer blower. The little one in the exhaust line ?

What it's doing doesn't sound normal.
Old 01-22-13, 12:28 PM
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The inducer motor should turn on and stay on as long as the thermostat is calling for heat, or more specifically whenever there is 24 VAC applied to the W terminal on the furnace.

I'd check to see if the thermostat is staying on by using a multimeter to check on that voltage. If the voltage is present and the inducer motor isn't staying on, yes, your should be concerned.

Either the inducer motor is fail;ing or the circuit board is failing to turn the inducer motor on properly, and this will likely progress to failure of the furnace to light.

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