Top 20 Dometic 3109228.001 Duo Therm Comfort Control 5 Button Questions & Answers

open circuit or out of range indoor temperture sensor. locks out cool and heat.

sounds like thermostat issue not communicating with relay modeule

i would remove cover on roof & try to get a closer look at issue.

you sither have to remove cover on top or look under it on roof should see a tube for draiage.

What model is the hvac unit that it is hooked to? There is a high possibility that the wires are not hooked up right. You should check the connections at the hvac and see if they are color coded and wired right.

se if you have 12 volts dc available might be a fuse.

sounds like defective t-stat or it needs to have time and setpoints reconfigured

takes 12 volts d.c to work.

Do you know how to access your furnace wiring ? What make/model furnace?

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.