Fridge warming up overnight

[MalibuDave42]

Dometic DMR702. No error codes. On shore power or propane, fridge\freezer cools down. Seems to work great during the day. Temps 34'ish and -2.5'ish, right on target. Overnight, the temps go up a bit.. 42-45, 8-10. As the day warms up, the fridge gets going to bring the temps back down.

- I did the "unplug from controller board, 120v directly plug in the AC heater" test - brought the temp right in line.
- I replaced the tank pigtails and the switching propane regulator (it was not putting out enough propane to support all devices). Tests out fine now.
- I replaced the igniter\thermocouple.. was time to replace it.
- The flame is a nice blue quarter sized -- looks great.

It seems something is telling the controller, the temp is good. Any thoughts are greatly appreciated.

[Old-Biscuit]

That model does not have 'defrost' mode
That model is equipped with an automatic Low Ambient Control (LAC) function
*turns food compartment light ON when ambient air temps drop below 50*F ---- no on/off switch (light causes a heat load so thermostat calls for longer heat cycles/colder temps
That model only has 3 temp setting.....narrow range control

You have proven cooling unit functions properly (Direct wiring of element)

SO......
Unplug the thermistor leads from lower circuit board (P2 connector at J3 --- S/B white leads)
Run fridge overnight w/o thermistor sensing and fridge temps should go down and stay down
If they do replace the thermistor

Snip-The-Tip Rheostat thermistor replacement

[wopachop]

Could it be related to the auto defrost setting?
Do you have a little thermometer in there tracking temps? The graph could tell you a lot about how often and how long the cooling cycles last.

[rrupert]

Did you uplug the thermocouple to see if the fridge goes into the emergency cooling mode?