blower motor

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  #1  
Old 07-20-14, 08:36 AM
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blower motor

I have a 2ton carrier unit it stopped working the other day. I checked everything and came up with the blower motor is spinning at half speed and the motor is making a knocking noise. I changed the fan relay and still have the problem does this sound like a bad motor or losing power somewhere. And yes it spins freely.
 
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Old 07-20-14, 08:51 AM
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If the motor spins freely and the shaft is tight (meaning it has no lateral movement) then the bearing are probably OK. The windings might be burned out. Or full voltage may not be getting to the motor in which case I think you hear a humming noise and little or no movement. Others can better guide you but I suspect a control circuit is bad.
 
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Old 07-20-14, 09:05 AM
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What is the model number of your furnace / air handler?
 
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Old 07-20-14, 09:26 AM
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FXM4X2400A this is the model number
 
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Old 07-20-14, 09:47 AM
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http://dar.proflo.com/darmanager/Que...USE_TYPE=PARTS

Looks like you have an ICP air handler with an ECM X13 motor.

Did you replace a fan relay in the indoor unit using a soldering iron or the whole control board?

What speed tap terminals are blower motor blue and white using?

Do you have a volt meter?
 
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Old 07-20-14, 09:49 AM
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I replace the entire relaty board
 
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Old 07-20-14, 10:37 AM
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What speed tap terminals are blower motor blue and white using at the new control board?
Is blue at 2 and white at 4?

Do you have a volt meter?
 
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