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Fan runs but compressor won't start. Compressor tries to come on every couple of minutes, dimming lights when it does, then stops. The other unit starts and runs just fine. The problem started just lately; it has worked fine for years.

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You could start by checking the capacitor. Then use an ohmmeter and check the fan windings. Hook one meter lead to com lead. Then hook the other meter lead to the run lead and then the start lead, reading the resistance each time. Then read from each to ground (compressor case). You could also use an ammeter to check the current draw when it starts. Hopefully it's just the capacitor.

Posted on May 31, 2010


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Please help us by observing and giving us a few more details:

When the Air Conditioner first comes on, do you hear the compressor start up?
does the room air fan come on?

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