An evaporator coil of a single evaporator, air cooled refrigerator is accumulating excessive frost due to a failure of the defrost mechanism. If the refrigerator features a thermostatically controlled box solenoid and a low pressure cutout controlled compressor, as well as a high pressure cutout, in terms of the compressor, what would be the most likely operating symptom?

Question

Accepted Answer

Option A: short cycle on low pressure cutout. Heavy frost acts as an effective thermal insulator, preventing heat transfer and boiling inside the evaporator. This starves the compressor of suction gas, rapidly dropping suction pressure and causing low-pressure cutout short cycling.