Question about Dometic Rooftop RV Air Conditioner

2 Answers

I have a Dometic rooftop AC, 59516.331, and an Atwood 8531 furnace with an analog Duotherm thermostat. I have recently replaced the thermostat. My heat system will only run with the thermostat maxed out. When the system reaches temp., I get a constant clicking sound (I think in AC unit area), whereas the system starts and stops constantly. Same goes for when i run AC. Problem has gotten progressively worse, that's why I replaced the thermostat. Now the comperessor on AC never shuts off except when I switch off at circut breaker(a recent addition to my probs). Both devices work when they are running (AC sends cold air, Heater sends hot), but temps never correspond to thermostat. Any help would be greatly appreciated.

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  • tim_maxers Mar 15, 2011

    I'm going to camper later this week, as I keep it seasonal. I'll be sure to take my meter and test as you suggest. Will let you kno how it works out.

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  • Master
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The contactor for the compressor may be stuck. Remove the outside shell and locate the contactor to see if this is the case. The contactor may be located in a metal box once you remove the units cover. You may be able to just tap it and get it unstuck but it would probably be best to replace the contactor.Also check the voltage and other parts.Keep updated with details.Thanks.Helpmech.

Posted on Mar 15, 2011

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  • Dometic Master
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Be sure to double check wiring between thermostat and control/relay box at ceiling assembly. For example ( sometimes they will connect a yellow wire from box, to an orange in harness that goes to thermostat.) Make sure they all match your instructions on thermostat to coincide with whats coming out of the control box. If it's yellow from control box, and connected to a brown in harness to thermostat location, then consider that a yellow etc. Make sure you only have approx 7.5 volts DC at far left red as marked and not 12 VDC.
Up at the control box wiring, you should see 2 blue/with white stripe wires. Those are your 2 wires for furnace. I you test voltage at those, you should get min. 12vdc on one wire constantly, then when thermostat moved to higher temperature and calling for heat, you should get 12vdc at both blue/with white stripe. It sounds like control/relay box needs replacing, but if you have a multimeter and are comfortable with it's use, I will get you to check outside at furnace as well, just to confirm my suspicions. A new box is roughly $90-$100.

Posted on Mar 15, 2011

  • Mike Butler
    Mike Butler Mar 15, 2011

    Be sure to give those wires a good wiggle up at control box as well to make sure all those connections are good .

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