Delfield ColdPro Refrigerator, Commercial unit, two door reach in... recently has begun to freeze.... Temp setting stays at 37F and for some reason, just on occasion it will drop to 0... and everything freezes if I don't check it.... why would the temp drop to 0?
Refrigerators - Delfield - (F18WC60) Commercial Refrigerator
Answers & Comments
Intermittent failure of thermostat is the most likely problem.
Check the temp sensor to make sure it is clean.
You can check for voltage coming out of the thermostat when the unit is working improperly.
If the setting is on.... say, 36, the temp is... say, 26, and there is still voltage coming from the T-stat telling the compressor and fan motors to operate, then you have a bad T-stat/sensor.
Most T-stats for that type unit do not have a separate removable sensor, its all one part with a sensor on a long tube/wire.
You can probably buy one from your local refrigeration supply warehouse for less than 35 bucks.
If it were a more consistent problem, I would say you have clogged coils or low refrigerant. But if most times it works fine, and then just randomly will not shut off, that's likely a controls thing. = T-stat.