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Dometic RV A/c compressor runs every 10 minutes

I have a new RV with a Dometic A/C and wall mount Tstat. It appears that the compressor starts every 10 minutes. The fan does not come on and this happens even when a/c is set to off.

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  • sstgermain May 16, 2009

    When A/c thermostat is set to cool the fan wil come on and the unit works fine. The fan is not bad.

  • sstgermain May 16, 2009

    Thermostat is turned off. Thermostat is not calling for cold air. Sitting on couch I hear compressor only come on for 5 or 6 minutes when unit is NOT calling for cooling. It will then shut itself off. When I turn on A/C and ask for cold air by setting thermostat down it will come on and run normal, fan comes on then compressor comes on voila cold air.

  • sstgermain May 17, 2009

    I think itis the controller in the A/C unit itself as I discnect the Tstatand it still does it.This Dometic has a controller box in he A/C unit itself.



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Looks like the fan is jammed or a coil has burnt out, resulting in heat which when detected by the thermostat, passes the compressor to star, but since the fan isn't working it manages to drop the temp near the sensor causing the compressor to shut down & restart quickly. Get the fan repaired/replaced at the earliest & don't use the m/c till then....sodeep

Posted on May 16, 2009

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  • Sudeep Chatterjee
    Sudeep Chatterjee May 16, 2009

    Firstly is the temp setting of the thermostat near the outside ambient temperature ? Thermostat setting if not solid state then chances are that it needs recalliberation, for eg, it is suppossed to switch on the fan & compressor at the same time with the compressor having maybe a 10 sec gap. This means it has to activate 2 circuits at one instance. Somehow at warmer temperature, it is switching on the compressor only and not the fan. This can happen on bimetallic strip type thermostat and solid state too if there is carbon deposit on the contact points. So the thermostat is causing this problem...sodeep

  • Sudeep Chatterjee
    Sudeep Chatterjee May 16, 2009

    This is a clear indication that the thermostat is not responding or behaving as it should. All symptoms are indication of the thermostat malfunction because its not releasing the right commands at warmer condition but functioning when set to cold. The relays(circuits) are not getting activated at the right time. The compressor is still ok because a built-in safety feature breaks the compressor circuit to prevent damage to it(due to overheating). I feel you are lucky to have the compressor still functional, only replacing the thermostat should solve it...............sodeep

  • Sudeep Chatterjee
    Sudeep Chatterjee May 17, 2009

    From your observations I agree that since you are at the site and with the freedom to experiment on the A/C, that your conclusion is perfectly logical that if even without the thermostat the behavior does not change therefore even if the thermostat is passing on the command to the a/c controls are not responding. Thus its seems to operate on a cycle of its own and not from the thermostat, as it should do in normal conditions. However yu will need to confirm that signal/command is indeed coming from the thermostat but is not being fecogonized or that the thermostats signals have malfunctioned i.e the eltronic circuitry which issues those commands after interpreting the data coming from its sensor. If you can get hold of a similar thermostat from a friend or borrow one you can then make your final desicion. And if its the thermostat only then replacing it would be most cost effective.........sodeep



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