Question about Dometic Rooftop RV Air Conditioner

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Penguin RV air conditioner does not power on. Have 120 volts to the air conditioning unit. When I turn on power switch to unit nothing come on.

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Check on the cut off relay connected to the compressor. Also check if the capacitor to the motor is faulty. You can test for power to the relay and the resistancce of the compressor motor coils to make sure that the motor is intact. if not one of the above is faulty.
replace and test.

Posted on Aug 30, 2010

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A solenoid (magnetic contactor), a motor, or wires can produce chattering sound. I think most likely you hear a solenoid that transfers the RV load from one source to another. A manual transfer switch would be quiet.
Electric alternating current solenoids have laminations that can loosen from each other thru vibration and aging, becoming noisy, and are noramly buzzing when energyzed even when new.

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The propane furnace with it's 12 volt blower motor will run off the battery alone but not for long, you will need 6 x 6 volt golf cart batteries to use 12 volt power very long, no single 12 volt deep cycle battery has sufficient capacity to single handedly operate much for long.

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If you have AC hydro for sure to unit, perhaps a fuse in the 12 volt DC panel has blown, or in thermostat itself. Hear any clicking at AC unit when turned on? If not, check all your fuses in 12 volt DC panel. Check breaker didn't trip also on 120 VAC.

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