Maximum time between defrost cycles is 60 hours. Minimum time between defrost cycles is 8 hours. Maximum defrost cycle time is 45 minutes. Thus a thermistor can measure the temperature in a space and translate that into an electrical signal that a logic board can use.įor example, if the temperature in a space gets too low, the thermistor will tell the logic board, and the logic board can close an air damper to warm the space a little.ĭefrost intervals (time between defrost cycles) are controlled by the frequency and duration of freezer and fresh food door openings, defrost heater runtime and compressor runtime. The resistance of a thermistor varies inversely with the temperature of the thermistor the lower the temperature, the higher the resistance. ![]() Thermistors are simply variable resistors. In addition to defrost functions, this board gets inputs from thermistors and controls the operation of fans, damper doors and heaters throughout the refrigerator, as well as water-in-door, icemaker, ice crusher and auger functions. ![]() These machines use a very complex "control board" accessible at the right rear of the refrigerator.
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