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Old 11-08-2019, 07:55 AM   #1
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Furnace blower motor constantly running


Model: Goodman GME95; around 6 years old
Issue: blower motor runs continuously

Tests done so far:
1. All thermostat wires checked for short, including G and R combination. Thermostat is on auto and is not sending voltage on G signal when no heat (W) is being asked for. In fact, the blower motor runs continuously even if all thermostat wires removed from circuit board. Thermostat is an ecobee3lite.
2. The circuit board 3amp fuse is intact.
3. 24v circuits were checked and functioning properly, including high limit switch, and both flame rollouts getting continuity in normal course
4. No error codes on circuit board, nor any error code history
5. Circuit board set for default single stage operation with blower motor timeout at 100 seconds
6. Tried turning the furnace off at main/breakers for an hour and turned on again to reset anything.

However, the blower is constantly getting 125v signal on HI-HEAT prong all the time and starts running as soon as the circuit board gets power and doesn't stop ever. Not sure what else to check.

PCB# Goodman PCBBF132
Photo of PCB attached just in case.
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Furnace blower motor constantly running-91e1eiwqfzl._sl1500_.jpg  
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Old 11-08-2019, 10:17 AM   #2
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Re: Furnace blower motor constantly running


Try read the wiring diagram and see which relay is the fan relay. One of those black plastic ones on the right is.

Then tap it gently with the back of a screwdriver. Or you can try tap all of them. Probably the fan relay is stuck ON. If it stops then that is the issue.
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Old 11-09-2019, 06:14 AM   #3
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Re: Furnace blower motor constantly running


Have you changed out your thermostat recently to a power stealing thermostat?
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Old 11-09-2019, 07:43 AM   #4
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Re: Furnace blower motor constantly running


Thermostat is an ecobee3lite,

He says it runs even with all the tstat wires disconnected from the board.

I don't know if that is a power stealer. Some of them can permanently damage boards.
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