Question about Dometic Rooftop RV Air Conditioner

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RV air conditioning

My air will get down to the right temperature then shut off . It will go on again immediately for about 20 seconds and then shut down. I was told it was the high pressure switch. How do I remedey the situation?


Richard

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Your system does not have a high pressure switch. Look to a voltage supply problem.

Posted on Jul 07, 2008

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1 Answer

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The thermostat has a differential built into the temperature sensing operation. The differential is normally a degree or more. If the stat shuts down at 72 degrees it should not start the unit again until the temperature in the room reaches 73. If the AC runs and cools properly until it shuts down, I would check the thermostat. The AC can not restart immediately after it shuts off because the pressures in the system are too high at the compressor. It takes a few minutes for the pressures equalize allowing the compressor to start. If the stat tells the unit to start under high pressure, the compressor will shut down on overload. It will start and run after the pressure falls enough for the compressor motor to run.

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Most likley this is caused by a pressure switch dropping out then making again after the pressure drops off. Try cleaning your coil on the outside on the roof as most likley it is a high pressure switch causing this problem.

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1 Answer

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Relay for the compressor may be stuck ( Contacts welded) both the fan and the compressor should operate at the same time. Have the relay(s) checked and possibly replaced.

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