GeminThermistor digital sensors are used with electronically controlled systems they will be either NTC or PTC, negative or positive temp coefficient. Meaning the the resistance of the sensor changes with either a drop or increase in temperature.
Please remember: Electrical work is inherently dangerous. Always unplug appliances before inspecting and never work on live circuits. If in doubt, consult a qualified electrician.
Modern electronically controlled fridges use digital sensors called thermistors (NTC or PTC) to monitor internal temperatures. These sensors change their electrical resistance as the temperature shifts, sending a signal back to the main control board.
How to Test Your Thermistor:
Multimeter Check: Measure the resistance of the sensor. Compare your reading to the manufacturer’s technical specifications for that specific temperature.
The Heat Test: While measuring resistance, hold the sensor in your hand. The heat from your body should cause the resistance reading to change steadily—this is a strong indicator that the thermistor is functioning.
Control Board Check: If the thermistors are fine, the issue may be the control board. Look for burnt components or loose terminal connections. Sometimes a simple "power cycle" (turning it off and on) can reset a software glitch.
These can fail but quality is a factor here so always buy good quality replacements and its relatively easy to test these sensors.
The sensor detects the temperature which alters the resistance internally of the sensor this resistance is then fed back to the control board, you can test the thermistor yourself by take a resistance reading with your multimeter and make sure it matches manufacturer specs at the temperature it is measured at. You can also use your hand to increase the sensors temperature while measuring and ensure the resistance changes as this is a good sign the thermistor is working fine.
Two wire sensor see below for test procedure
Of course it could be the board that has failed so a quick check over for burnt components , check the incoming and out going terminal connections are clean and tight a spray of electric PCB cleaner can help often is there a reset button on the unit to reset it as often the software controlling then can need a reset or just plain turning off and rebooting.
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