My `RV Duo Therm works well if I have the thermostat turned up. As soon as I set it to a controlled temp on Auto it will cycle on and off every 20-30 seconds. The fan starts, a few seconds later the compressor starts, it runs for about 20-30 seconds, the unit shuts off. It will continue this pattern all day long if you allow it. I checked the obvious and can not see or find anything out of the order. It's not the coil / compressor since it will run and cool fine when the thermostat is up high.
Sounds like thermostat is failing. There is a factory set resistor that helps the thermostat keep a 2 degree accuracy. Second possibility is that you have a fan or direct airflow from the cooling system, being devirted, that is allowing the cool air hit the thermostat on the wall.
SOURCE: duo-therm by dometic ac rv unit
I suspect that you have a bad selector switch for the on, off, low fan, high fan operation. If the selector switch is put into the off position everything should stop completely.
SOURCE: i have a duo therm air conditioner think thermostat problem
Google dometic rooftop air conditioning parts!Wouldnt suggest using off brand parts maybe diffrent?if that one is set up for 12v also maybe deffinatley diffrent!!!Try cleaning condensor aluminum fins on roof top if condensor is dirty will throw whole system out of whack!!!use oven cleaner and hose with nozzle be careful not to bend fins throughly rinse off cleaner after soak period spray off completly off roof and sides quickly!!!!!may damage decals etc!!! anyhow try that before replacing parts then use factory or alike parts!!!Good Luck!!!
SOURCE: can my duo-therm air conditioner on my rv be recharged?
These unit can be recharged. 134A. You NEED A SERVICE TECH THAT KNOWS HOW TO CHARGE UNIT.RUS
SOURCE: Dometec Briskair Duo-Therm Compressor won't quit running
Have you taken return air filter grille down at ceiling assy, & cleaned filter with dish soap & warm water? Check & see if you see little probe sticking out in behind there, and wipe it carefully as well, and make sure it's lined up to sense air flowing through there. Take a flashlight & look up into coils at front for lots of dust on them as well. Perhaps a thorough cleaning of all coils is in order if you say there's lots of dust, as choking airflow off with dust & dirt, will only shorten life of unit & use more hydro than necessary.
SOURCE: duo therm air conditioner that the compressor will not start
your switch should be oopen but when it reaches 41 degrees it should open so the system shuts off before it damages the compresor by sludging it, i have the same unit and my compresor runs for 5 seconds and shuts off, i checked the amp draw at the compresor and it draws 21 22 amps trying to start after the initial 5 second run, but it wont come on againts a load so the comprresos equilizes and tries to start over again with out positive results. i bipass the external obverload on top of compresor terminals area, still no fix yet, the relay on the control board continious to send power to the compresor and still draws , so if there is a problem with the control relay i would open up and dont send power to the compresor so i dont think is the relay, i am a a/c service man for
35 years and do this for a living still today, by experience i think it is the compresor gone bad but will try by passing the relay just to see what happens, also it could be bad capacitor since it have a hard start relay and start capacitor (black )also a run (silver ) capacitor they check ok, there is no way to check the charge unles you install a saddle tap to check presures and rechage this unit i think the compresor replacement is the way to go ( around 250) plus labor and freon r22 e mail add [email protected].
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