Question about Dometic Rooftop RV Air Conditioner

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When Unit is switched off . The outside part turns on = off as if working, I have just been up to check, found compressor is also runningas is fan motor. we just switched A/C back on to cool , all working OK. Could it be the Stat unit inside at fault.If so here are No.... Electra-teck 50-00402-C ..Stat3176955.065 ... 3107612.024 Duo-Therm, Domestic Thank you Terry Email . lonestarbreeze@aol.com

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The easiest way to see if it is the thermostat is to write down what wire goes where and pull all the wires off. If it still does it, it's not the thermostat. If it stops, you'll need to get a new thermostat. Let me know what you find out.

Posted on Sep 28, 2010

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2002 4 ton Bryant air conditioner shuts off, fan still runs but not cooling is problem in the controls in the attic or in the AC unit or both?


With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.

If the system is not calling for cool and the fan continues to run the fan relay is sticking. common problem. Sometimes after running for several days the relay will stop sticking if not, replace relay.

If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
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Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.

Hope this helps.

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