Top 20 Dometic Rooftop RV Air Conditioner Questions & Answers

Unsure if that is a refrigerator or an Air Conditioner.

Please add information to your question as to the model, or whatever you can tell.

Dometic Rooftop... | 198 views | 0 helpful votes

First replaced the thermostat then check on condenser unit that's outside .make sure the fan is running when compressor runs .if not there is your issue .If fan runs and compressor keep shutting off you might have a dirty coil so clean it out with water or you might have a leak in the system causing unit to shut off on low pressure .if this is the case you need to call a service technician .
Try simple things first like clean coil ,capicator and fan operation.

Dometic Rooftop... | 1,228 views | 0 helpful votes

Don't really understand what you mean by roof top duct unit .if it's a roof top unit and water is leaking down your vent then you have a clogged drain line .

Dometic Rooftop... | 226 views | 0 helpful votes

You need to get a different can change an analog thermostat to digital, but you have to replace the motherboard with a digital compliant one. You can't just change the thermostat. Your best bet is to put back the old thermostat or upgrade to a different compatable thermostat

Dometic Rooftop... | 636 views | 0 helpful votes

or bad board in ac

Dometic Rooftop... | 297 views | 0 helpful votes

Go to your heater and locate the circuit board inside. There is a 3 amp fuse that protects the board and it is a regular auto fuse and isn't made for any surges in the system. When you turned your generator on with the system on, chances are you surged the system and that fuse went. Breakers allow for surges where fuses don't

Dometic Rooftop... | 358 views | 0 helpful votes

bad cooling unit replace whole unit

Dometic Rooftop... | 730 views | 0 helpful votes

I think you checked voltage across the run capacitor, the brown and white wires. The voltage to the motor would be on the black and white wires And inside the motor, a thermal protection device opens the black wire, leaving no potential voltage to the other voltage line nor capacitor line ( brown and white are the same line).
The solution, varify that the motor is wired correctly, then that the capacitor value is correct, not weakened, that the motor vent holes are not blocked or obstructed, that the motor amps are not exceeded, that the motor bearings have no side play and not worn.
Before replacing the motor, make sure the wiring is correct, the motor and capacitor are not good.

Dometic Rooftop... | 511 views | 0 helpful votes

make sure fan is on auto

Dometic Rooftop... | 266 views | 0 helpful votes

have to clean from above

Dometic Rooftop... | 184 views | 0 helpful votes

make sure fan is set auto its just seeing fan motor now

Dometic Rooftop... | 1,140 views | 0 helpful votes

Your unit have dirty coil.
Shut unit off and clean the coil also change filter for indoor unit .Unit is shutting off on high head pressure

Dometic Rooftop... | 1,567 views | 0 helpful votes

possible bad temp sensor or board inside unit

Dometic Rooftop... | 401 views | 0 helpful votes

number 1 or main ac gets blue wires they go to board

Dometic Rooftop... | 1,046 views | 0 helpful votes

Make sure your tstat is programmed for electric, not gas. Or in the settings you want that the TSTAT CONTROLS THE FAN.

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Dometic Rooftop... | 237 views | 0 helpful votes

It is possible that a sudden loss of power caused the fan to run backwards. Usually that happens to a compressor, not a blower but I can't think of any other reason. May consider installing a time delay (delay on break), right on the red to the tstat rather than yellow, to ensure everything is included in the delay. Most newer tstats have them built in, possibly upgrade tstat.

If you need further help, reach me via phone at

Dometic Rooftop... | 51 views | 0 helpful votes

possible low voltage needs 12 volts to run board when onLP

Dometic Rooftop... | 91 views | 0 helpful votes

make sure fan is on auto

Dometic Rooftop... | 88 views | 0 helpful votes

Sounds like it needs rewiring or replace with a more modern one.

Dometic Rooftop... | 299 views | 0 helpful votes

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