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christ2 10-24-2012 10:43 AM

Bryant 355MAV Inducer Motor won't run
Checked variable speed furnace control for 115-vac across PL2-4 and NEUTRAL-L2. Voltmeter measures 110-vac. This was on the homes 1st floor furnace where the inducer motor will not start after the heat sequence is initiated and the blower motor runs.

Should only 110-vac instead of 115-vac cause the inducer motor to not start?

There is a second identical furnace and furnace controller in the home to heat the 2nd floor zones. The voltage is 121-vac when testing the voltage across the same PL2-4 and L2 terminals.

I do not understand why only 110-vac instead of 121-vac like on the other furnace controller.

I am thinking the inducer motor should start with 110-vac. Checked for obstructions and there are none. Motor turns freely.

Thank you in advance for any help you can offer.

christ2 10-24-2012 12:35 PM

Just checked the PL 11-6 and PL11-12 voltage to the inducer motor. Getting 120-VAC directly to the motor at this point.

So, whatever the reason only measuring 100-VAC at the PL2-4 and NEUTRAL-L2 on the control board does not seem to affect getting 120-VAC at the inducer motor.

Beginning to believe defective motor. Going to try a few more diagnostic checks.

Probably will swap out identical motor from the 2nd floor furnace to replace what appears to be a defective inducer motor on the 1st floor furnace. Will be purchasing a new replacement inducer motor if the swapped out motor runs.

Marty S. 10-24-2012 06:25 PM

No need to go through all that. The motor has voltage and is not working, that's good enough to call it shot.

ben's plumbing 10-24-2012 07:23 PM

for sure if you have 120 volt at inducer motor with call for heat...check for loose connections....if all tight ..replace inducer...ben sr

christ2 10-25-2012 10:38 AM

Thanks guys. I replaced the motor last night and all is well in wifey-land.

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