Bryant 350MAV Fan Won't Turn On - HVAC - DIY Chatroom Home Improvement Forum

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Old 09-15-2009, 09:29 PM   #1
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Bryant 350MAV fan won't turn on

I'm working on a Bryant 350 MAV, 2001 year model, combined gas furnace and split AC system w/ separate electronic air cleaner. System sat unused for approximately 5 months (spring to summer in Los Angeles -- warm to hot). AC then operated properly for 1 day. The following day, AC was turned on, external unit cycled continuously throughout the day but the home was not cooled; inspection at the end of the day revealed that the blower fan was not operating. The LED did not show any error codes (LED constant on). 3 amp fuse is visibly intact; removing the fuse causes fuse error code to flash. Motor turns easily. Powering up the system with the thermostat fan switch set to ON causes a single audible relay click; the power light on the air filter (which is downstream of the control board and blower unit) comes on, but the blower does not operate. Replacing the run capacitor on the blower motor had no effect. I pulled the blower fan and purchased a replacement motor (same voltage, speeds, etc. as OEM) and matching capacitor from Grainger. As a test, I hooked the replacement motor up to the control board without installing it in the squirrel cage. Powering up the system with the thermostat fan switch set to ON and depressing the door switch caused the same symptoms as before (a single relay click sound; the power light on the air filter comes on; the blower motor does not turn). All wire connections are visibly intact. I suspect that the control board is bad (the control board model is identical to that shown at Blower Fan Won't Come On). Any suggestions would be greatly appreciated.


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Old 09-15-2009, 09:35 PM   #2
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Time to get a DVOM and check to see if the control board is send power to the blower motor. Check both a/c and heat.


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