Question about Ruud UBHC Air Conditioner

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Compressor on Ruud Unit UAMA-042JAZ and its fan won't run. Electric comany said low voltage circuitboard problem. Suggested replacing the fuse on the circuitboard. I could not find a fuse, where would it be loacated?

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The units has what you call a contactor which is actually a relay but it does not look like a relay. You can get a none conducting material to depress it. and the compressor should run and the fan. Be very careful since that contactor has exposed parts and it has 220 volts running through it. That contactor coils is energized by low voltage current usually around 12 to 24 volts and it is supplied by a small transformer near the evaporator in the attic. There is a contact and when the contactor is energized magnetic field pulls it in so the contact on the 220 volts touches and the AC unit runs. Another word of caution, do not turn the unit manually one after another. this may damaged the compressor. Wait a few minutes each time you manually push the contactor to see the problem. Good luck.

Posted on May 28, 2011

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