Subject fridg. runs for a few days, then just stops in defrost. Measured the evaporator thermistor and got 16 Kohm between J1 pin 5 and pin 4, per the schematic I have. I assume this is the reason it never terminated defrost as this represents 32 degrees. There is no schematic with this fridg.
Replaced the thermistor, which measured 5K ohm. Checked it at the J1 connector and still measured 16K ohm.
Am confused, maybe this fridg is wired differently??
Hope someone has seen this before.
I found the problem. The resistance I measured was internal to the motherboard. A repairman before me messed up the thermistor wires in the freezer harness, evaporator thermistor wires where open, so the motherboard never terminated defrost as it sensed a low temperature.