Dometic Heating & Cooling - Popular Questions, Answers, Tips & Manuals

check amp draw either bad compressor or fan motor

Call for AC / refrigeration service, it needs refrigerant gas and needs to be checked for leaks. https://www.google.com/search?q=Dometic+Duo+Therm+short+cycles ..

check compressor relay possible stuck on

make sure thermostat on auto possible start up capacitor on compressor

possible heating element bad

check and test compressor relay and circuit

if power to unit and thermostat is calling for action then check start up capacitors

Start simple, verify proper voltage. Check capacitor. Then check motor.

https://acerrorcode.com/dometic-thermostat-error-codes.html

no info -look in your paperwork for your trailer unit and the mystery a/c unit and look up the trouble code in owners manual --notify jayco of problem --do online search of a/c using make and model for trouble shooting guide - rv shop

So original was ecm and you’re installing psc?? All low voltage speeds will go away and you just need to break the new, high voltage speeds, with a relay. Hope that helpsI can’t find info on the 135a. Does it have a control board to land wired to?? What model motor???Can’t make out the original wiring diagram. The white is your common or neutral. The different speeds are for constant fan speed, cooling speed, and heating speed, this is your hot. Not sure if you have a control board in your unit but if you do it will say “common/ fan/ cool/ heat/ park for places to land your wires. The browns go to capacitor and the orange and purples would get swapped if it were running backwards. ( meaning blowing air out of filter rather than pulling air through filter. Zip tie loose wires to prevent getting caught by wheel.

On a single phase universal motor with a start and a run capacitor, that is handy. The start capacitor is fully automatic as there is an internal centrifugal contact that breaks the contact when the motor reaches near running speed. The run capacitor puts one of the motor windings out of phase with the other and determines the direction. Placing the run capacitor on the neutral will make the motor go the other way than on the live.

you might be low on gas.

possible bad heater element

I take help from online websites that have this service like helping in repair some like reliable-store have instant help.. others are a bit slow which I don't prefer... rest is up to u.. U can also get free manuals

Need to go up there and give more info. Look for outdoor fan...Is it spinning? Compressor on? Could be dual capacitor as they are 50% of problem lately

check and test stat wiring

It sounds like your Dometic unit is not getting power despite the breaker being on. Unless the Dometic unit has an internal fuse to check, I would get out a volt/ohm meter and check to see: 1. Is there power coming out of the breaker that goes to the ac unit? 2. Is there power at the terminals of the ac unit? (You can sometimes remove a ceiling cover to access the contacts on the on off switch. Lastly is your RV hooked up to full power with two 110 volts on both legs beside the neutral and ground wire? If you are only feeding your RV with a standard 110 volt extension cord and using an adapter, that can mean half the circuits in your RV are energized while the other half 110 volt leg is not. You must energize the second leg by using a full 30 amp or 50 amp dual power cord. RV's are funny. They require two 110 volt legs with a neutral and a ground. The two 110 volt legs are both of the same phase. There is no 220 volts between the two hot legs as they are in phase. A volt meter between the when hot would read zero volts, while each hot leg to neutral would read 110 volts. Hope this helps.

Direct Replacement? You can go to any hardware store and replace with any thermostat. If you have Air conditioning make sure you get one AC compatible

It sounds like your thermostat is stuck or your main contactor is stuck. Try shifting modes on your thermostat. If still stuck, try removing the thermostat, if the AC system did not stop it is your main contactor stuck and needs replaced. If your AC system stopped, it is your thermostat stuck and needs replaced.