Question about Dometic Rooftop RV Air Conditioner

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Will not shut off

Dometic(duo therm) roof top (brisk Air) air conditioner comes on when switch is turned on and stays on no matter what the temp setting. the thermostat is a dual heat and air control. the furnace works fine and shuts off at requested temp.
the thermostat has been replaced still have problem on the ac side

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  • argregoire Jun 04, 2008

    My ac will not cut off as well. Has a Duo Therm Analog control center. Runs constantly and cools, but not matter what the temp is the unit will not cut off.

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  • 230 Answers

Sounds like a stuck relay on the unit itself. Maybe there is a short in the control wire that comes from the thermostat that activates the fan.

The thermostat probably has one hot wire at all times. The thermostat then chooses which wire to send the voltage down based on your selection. One of those wires is probably for the fan only. Make sure that it is in good condition (no bare, pinched or wires)

Posted on Jun 17, 2008

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