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Old 02-20-2010, 06:36 PM   #1
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condenser fan replacement

Hi, I wish I would've found this site sooner. Maybe you guys can help me. My heat pump fan motor started squealing and finally quit working. It was a 3 wire fan with a 7.5mfd cap. I bought a 'universal' fan with the same specs except it uses a 5mfd cap which was supplied with the motor. I installed the fan and have the brown wire to one side of new cap and brown/white to other side of new cap per label on the motor. I have one motor lead (yellow) to one side of the relay/contactor and the other motor lead (black) going to the defrost relay that is fed from the other side of the contactor. Hooked the motor up and it ran fine for a few minutes. Disconnected the power while I fastened the lid down, turned everything back on and guess what? The fan doesn't work. I just get the hum from the relay. I checked all the connections to make sure nothing was loose and even bypassed the defrost relay to see if that was the issue. It wasn't still no fan. What could I have done wrong?


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Old 02-20-2010, 10:35 PM   #2
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Most universal motors have some extra leads to allow rotation reversal. If the wires are not secured properly the blade can cut them and cause this problem.

I'd also measure for 240 volts between yellow and black with demand present.


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Old 02-21-2010, 08:06 AM   #3
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Make sure you have the correct power to the fan , hook it up to the power supply for a test then if it works there is a control problem somewhere.
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Old 02-21-2010, 11:04 AM   #4
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make sure to wire it the way the diagram on motor shows,this might be differant from origional diagram on condensing unit
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Old 02-21-2010, 11:22 AM   #5
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As mentioned check your high voltage. Sounds like you piched a wire putting the top back on and blew a fuse or tripped a breaker. Should hear the compressor running and not just the contactor hum if 220 is present.
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