Dometic 701800004 Replacement Q-Logic Board - Page 3 - Answered Questions & Fixed issues
Dometic RV AC will not turn on unless therm set below 50. Air temp 80.
Your thermostat is no good. Depending on the age of the unit, you might be able to replace it. Pull the cover off the bottom of the unit to expose the thermostat. If it is an older unit, you'll have a copper capillary tube that is connected to the sealed system and you'll need to take it to an RV repair shop to have it replaced because it is a mechanical t-stat and you'll need to break into the sealed system to replace it. If it's a never unit and you have wires on it, It's a matter of pulling it out and finding a replacement
Dometic thermostat turns off and comes back on by itself
Dometic thermostat model 3314080
Most thermostats operate this way.
Instead of dropping the voltage a thermostat opens the circuit when the set temperature is reached, after which it closes again to redo the cycle again. The principle can be based on heat, time or pressure.
The animation, if the GIF runs, shows the basic principle for a thermostat switch in a heater/geyser, but can be modified to operate via a pressure diaphragm as used in ovens and fridge compressor relays. Strip heats/opens then closes.
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