When air conditioner is running in cool mode the heat pump will engage and blow hot air
Relay module or communication cable from t-stat issue.
SOURCE: I have a Duo Therm Roof top Camper air conditioner
how old is unit and does it have refrigerant in it
SOURCE: Dometic duo therm does not cool or heat...
it should never have to be recharged unless there is a leak. so you should isolate the leak with dye injectable into the system w/ the freon and correct it, then fully recharge system.
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: unit turns on but condensor dont kick in
Need to pull the cover off and see if the compressor is comming on.If not have someone with electical experience check the contacter.Sometimes bugs will get under the contacts durring wenter.If it is running the freon is low
SOURCE: Duo-therm fan only runs on low
useually a sticking fan relay in the controll board this is the closeest unit to a home based cenral air system and i would leave this one to the experts if you want to trouble shoot there is a detailed wiring diagram on the back side of the pc board cover on the fan and compessor unit it self there is a seperate relay for each speed on your unit make sure getting power to selected relay if not trace wiring and do continutity tests back to themostat
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