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Home > Home & Garden > Heating & Air Conditioning   »   Blower Motor bad or what?

 
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Old Sep 13, 2005, 11:12 AM
Aloha Bob
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Blower Motor bad or what?

Howdy, My FURNACE/AC blower motor has quit workng. Checked unit...the squirrel cage fan spins smoothy, no bearing noise or roughness, when turned by hand. When I turn A/C on I hear A/C unit come on but fan doesn't blow. Same when turning on heating unit. Same response in 'AUTO' or 'ON' modes.
I do hear a hum at motor...which goes off after a few seconds. It then trys to come on again in about 60-90 seconds to know avail.
When I spin the fan and turn it 'ON' the fan stops abruptly...same in either direction.
With humming noise on I cannot spin the fan manualy in either direction....
Is this fan, capacitor or relay problem?
Please advise....
Aloha, Bob Reynolds

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Old Sep 13, 2005, 12:41 PM   #2  
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Before giving up on the motor, check to see if it is getting power. On a modern HVAC set up, there is a control board in the furnace with logic controlling a relay that switches power to the motor, or selected coils. If the motor has several colored wires going to it, check to see if any of them are hot. If not, the problem is in the controls. A good first check is to give any little square boxes on the board a rap with a screwdriver handle. If the blower takes off, the relay is bad. The motor may also have a bad start capacitor, although usually when they go, the motor at least buzzes.
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