Goodman hvac furnace blower motor issues

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  #1  
Old 09-28-18, 02:00 PM
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Goodman hvac furnace blower motor issues

Howdy all and please bear with me:
I recently returned home to find my AC unit misbehaving. The compressor was working just fine but the blower/fan was doing nothing.
The thermostat outdoor pickup was not functioning and the digital thermostat was acting weird. I suspected a lightning strike or power surge.
This is a GOODMAN system using a GGMV951155DXBC LP furnace coupled with a 5 ton heat pump (TXV410).

So, after some unsatisfactory probing with the multimeter I did these things:
First I replaced the thermostat (BIG BLUE UNIVERSAL 3/2) with a brand new unit. This did not make the fan run.

Next, I replaced the control board with the recommended upgrade unit: PCBBF107S. I get the slow green light but the motor still did nothing when either using the thermostat or jumpering red/green (I can hear the relays click, but the motor does nothing).

Then, I replaced the motor with a brand-new model specific unit. Still green-lit, relays still clicking, no blower.

The last old component was the 24V transformer so I replaced that, as well. (At the terminal block I'm getting 27V plus/minus green to common with green/red jumpered- but only 19V coming off the board at the 16 pin connector or at the motor end of the 16 pin harness). Still green-lit, relays still clicking but the blower motor is still doing nothing.
I've got 120V at the motor, no problem. The compressor is firing right up when I kick on the cooling with the thermostat. The fan simply will not trigger.
Clearly I am a "component replacer" not an HVAC pro (or even amateur) but I am totally at a loss.
Any suggestions would be greatly appreciated.
Thanks.
J.
 
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  #2  
Old 09-28-18, 05:40 PM
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Welcome to the forums.

Thread moved to furnace forum and title changed to reflect furnace.

You have a heat pump and a gas furnace. A dual fuel system.
I see no listing on that model furnace. Is that model number correct ?
 
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Old 09-28-18, 05:48 PM
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Ah. Sorry, the model # is GMV951155DXBC.
 
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Old 09-28-18, 05:58 PM
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Does that use the Genteq ECM blower motor ?
 
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Old 09-29-18, 06:03 AM
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Old 10-08-18, 03:43 AM
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Yes, it is the GENTEQ ECM blower motor.
 
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