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I don't know if this relevant to the problem, but my A/C does the same thing as above prior to it's first start-up. When I turn on the air it will cycle as if were trying to start and the fan will hum.
When this happens, I take the shroud off and turn the fan blades until they run freely. Obviously, with the power off. Then when I put it back togeter it runs the rest of the season with no trouble.
Evidently, the motor shaft could use some lubrication but it's so much easier to spin the fan blades than take the motor apart.
Just a thought.
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