Dometic a/c, duotherm thermostat, turns right back on after it reaches desired temperture.

The thermostat usually has wire that reads the temp in the room. The wire runs through the wall and can pick up heat from the wall. Put a piece of insulation around the wire where it comes through the wall and leave only the end of the wire exposed.

Check for a heat source near the thermostat. Try adjusting the louvers so the cold air is not blowing on the location of the thermostat. Sun shining on the outside wall in the area of the thermostat on the inside wall will also affect the operation.

I have a dometic 13500 BTU Roof mount a/c. It is set up with the duo-therm analog thermostat. The system cools fine. The problem is that the a/c gets down to the right temp, then it turns off like it should but turns right back on within a few seconds. Any help would be greatly appreciated.

I solved the problem this weekend by removing the front cover, it appears that the control switches are in a bind. The heat and cool work fine now.

Air conditioner worked good yesterday, today not blowing cold air, fan runs but compressor kicks off in just a few seconds. Also probably second problem, thermostate must be set at 90 to get a 72 degree cool.

For everyone with an RV rooftop a/c install a Supco Relay & Hard Start Capacitor (cost around $15 with shipping on ebay) and you will find your a/c performs and cycles MUCH better than with the OME capacitor alone. Even if you aren't experiancing the problems some of these people are reporting, it will make your unit last longer as it takes a lot of stress off the compressor. No, I am not a salesman for these things! I had problems with my a/c cycling and shutting down my generator and this solved my problems. I don't even notice it cycle anymore on shorepower or generator.

I discovered that the drains for the catch basin under the cooling coils were both plugged up. After I cleared them out it seems to be working properly now. I suspect that it may have been frosting up.