The refrigeration unit will stay for days to over a week at the 36 degree set point, then randomly will go below freezing. I suspect the Thermostat and would like to know if anyone else has seen this same problem before I order it.
That cooler uses a Dixel digital cold control. So what is causing your problem, I suspect the thermistor connections are not secure to the controller or the thermal stresses of the evaporator is effecting the accuracy of the thermistor. What it comes down to is the controller is seeing a resistance that is higher than the evaporator's real temperature.
One other item that may cause it, the thermistor bonding to the evaporator coil. The coil in a cooler has to get down to between 14 and 19 degrees before the compressor stops to get the box to temp . Called take down. Most evaporator take down's are about 15 degrees F If the bonding clamp is loose, it will read box temp instead of coil temp.
Do you have any trouble codes? Like a P2?
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