Question about Dometic Rooftop RV Air Conditioner

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COMPRESSOR I HAVE A 13,500 DOMETIC ROOF TOP UNIT ON MY RV. THE COMPRESSOR COMES ON EVEN IF THE THERMOSTAT IS IN THE OFF POSITION. IT WILL COME ON AND RUN FOR APPROX 5 MINS. THAN SHUT OFF. IF YOU PUT THE THERMOSTAT ON COOL AND LOWER IT BELOW ROOM TEMP. IT WORKS FINE.

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  • bowerstravel May 24, 2009

    With the thermostat off the compressor will start and run for a few minutes then stop. This cycle continues until the circut breaker is turned off.

  • steve
    steve May 11, 2010

    Disconnect the thermostat from the unit. If it continues to do this the problem is isolated to a control inside the unit or a shorted thermostat wire.
    If it stops doing this the problem is the thermostat.


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Thermostat is bad
Replace it

Posted on Mar 06, 2010

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Change out the tstat

Posted on Jul 25, 2009

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2014 Dometic Brisk II 15,000 unit won't cool below 88 degrees


Check the unit to see if the outdoor fan and compressor are coming on. If not, check to see if power is reaching the contactor, both the high power contacts and the low voltage solenoid. Some contactors can be manually actuated, and a quick press (with a NON CONDUCTIVE ITEM) can show you if the contactor is engaging. If the solenoid is not working, check the wiring of your thermostat. When set to cool mode, there should be voltage on the solenoid of the primary contactor, sending power to the outdoor fan motor and compressor.

If the outdoor fan and compressor engage normally, then make certain the coils are free of debris and other blockages. If air flows freely and the compressor is running, feel the tubing for temperature changes. One side should grow cooler and the other warmer.

If the compressor runs but there is no temperature change, take your unit to a certified technician to check for leaks and system pressures. Roof top units typically use R22 refrigerant not R134a automotive refrigerant, which require EPA certification for purchase and dispensing.

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start to run
run to common
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May 16, 2009 | Dometic Rooftop RV Air Conditioner

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