Hi @pinkdiamond ,
Couldn’t find a free service manual online but have found this where it can be purchased.
Usually the manual shows how to get into the diagnostic mode and test the R & F temp thermistors and also the defrost thermistor.
The manual should also have the wiring diagram to show where the defrost thermistor connects to the mainboard.
Alternatively, on some other models I’ve found that on the mainboard, that where the defrost thermistor wires are connected, was designated as evap therm and GND. Check the mainboard and see if yours may be the same. ( maybe P8 1 & 2 if there?)
If you can see the designation at the mainboard harness plug then disconnect the power to the refrigerator and unplug the connector and place an Ohmmeter between the evap therm wire and GND on the plug wires. You should get a reading. You would have to know the specifications of the thermsitor to know whether it had the correct resistance for the temperature at the time of measurement as they are an NTC type (negative temp co-effiicient) which means that as the temp goes up their resistance goes down. You could try heating it slightly and see if the resistance drops but unless you know the specs, this is the best that you can do, besides the fact that you know it connects to the mainboard OK.
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