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We had an AC tech change out the motor to the fan in the outside AC unit and a new compacitor. When it rains the motor does not come on (the compressor comes on but not the fan).

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Weird!?! The only possible cause for this that I can think of is that the tech did not install the correct motor for an outdoor unit. Condenser fan motors are essentially sealed, it will look like a metal cylinder with a shaft sticking out one end and wires out the other. A motor intended for indoor use will have slots in the outside case to facilitate ventilation. Take a look and see if you see slots in the case of the motor where you can see inside to wires and the internal components. If you can, then you have the wrong motor, if it appears to be sealed to keep out the weather, then I haven't got a clue what it could be without getting my hands on it. Keep in mind that I am a service tech that usually diagnoses the equipment when it is in my presence.
Thanks,
Chillmaster

Posted on Jul 04, 2008

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