Question about Dometic Rooftop RV Air Conditioner

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Dometic unit cools great but compressor does not cut off when desired temperature is reached. The thermostat is on wall. The fan will cutoff at proper temperature but the compressor keeps humming and therefore builds up ice without fan running. What would the problem be?

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Hi, as you know the thermostat controls the unit. Here's what you need to do first. Go to your thermostat on the wall, pull off the cover. You are looking for the main control wires that come in from the back to connect to the screw terminals. Don't be afraid of shock as these are millivolt wiring connections.You say the fan shuts off but the compressor keeps running causing it to ice up. You need to get a screw driver and disconnect the wires from this stat. This should cause the compressor, fan, and all to shut down. If it does, you know that your thermostat is faulty and you will need to make your self a drawing on the wire connections, remove the stat, and you can get a new one at a RV sales and parts house.Find your breaker box where your main wiring comes in and shut off the a/c breaker if you like. Now, if the compressor keeps running after you disconnect it from the thermostat, then somewhere from the stat to the controls on the top have a hot wire that is touching somewhere causing the compressor to be energized all of the time. If you can go up top and find where this thermostat wire comes in, look it over good to see if the red is touching the yellow wire some where. I believe you just have a faulty stat at this point. Do what I asked on the stat, disconnect it completely, and we will go from there. You can get back to me by leaving a comment under my user name. Please let me know and we will take care of this problem.
Sincerely,
Shastalaker7
A/C, and Heating Contractor

Posted on Oct 01, 2010

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