We have 45 GE Zoneline model# A38693DJALWI that have been upgraded with a WP29X0055 control panel. There is no documentation and as a result, troubleshooting is tedious.

I am looking for information concerning the thermistors used
to determine temperatures of the indoor coils, outdoor coil, room temperature, and outdoor temperature - specificly the resistance of the thermistor sensors at a specified temperature.

Also trying to find service manual for these machines. Any assistance is appreciated.