On most Dometics, When you have a cooling problem follow these steps and it will resolve your problem or at least tell you what is wrong.
Check main terminal Block for proper Voltage
Check Heating element for proper ohms, 2652 is 44ohms
Disconnect P-2 wire on board for approximately 12 to 18 hrs. This makes the unit run constantly in case there is a clog in the unit.
The only other thing you may do is check the thermistor operation, Unplug the P-2, remove the thermistor from inside the refrigerator, put it in ice, You want the thermistor to drop to about 32 degrees, Check the ohms, they should be at 8,000 to 10,000 ohms.
If all checks out, you have either a bad board, not common, or a bad cooling unit, common

I had this problem myself, If you are trying to use your fridge on lp (propane) it's the thermocoupler ..Not the right amount of milliamps to your circuit board will shut down your fridge. and the check light will come on

Hi there,
this is a wiring problem from inside the fridge. call your local repairman to fix this problem.