ducane model mpga075b3b
 
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Old 11-15-2012, 07:37 AM   #1
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ducane model mpga075b3b

had blower motor replaced per hvac contractor. did not solve problem. demand on motor but it hums. old motor bench tested okay. what tells motor to fire up. stat is okay. furnace fires up but shuts down when motor does not start

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Old 11-15-2012, 10:26 PM   #2
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Re: ducane model mpga075b3b

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Originally Posted by crusse View Post
had blower motor replaced per hvac contractor. did not solve problem. demand on motor but it hums. old motor bench tested okay. what tells motor to fire up. stat is okay. furnace fires up but shuts down when motor does not start
There should be a fan relay of fan contactor that energizes the fan motor. There may be a issue with the fan relay.
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