Regardless of a particular design, any color discoloration, cracking or bulging would indicate a problem with the thermistor and it will need to be replaced. Since then, all GE refrigerators (not just PFCF1NFW model) contain EPCOS thermistors which have conductors embedded in a sealed, flat-top design in white polymer shells.
This casing will also have a distinct “dome”. Keystone/Thermometrics thermistors have an open bottom (usually in black) at the point of wire entry into the polymer casing. Keystone (Thermometrics) vs EPCOS ThermistorsĪround 2010, GE discontinued using thermistors made by Keystone/Thermometrics under the General Electric Information Services (GEIS) label due to high failure rate caused by moisture penetration. On the other hand, defrost thermostat is a less technologically advanced device consisting of bi-metals (often made of copper and aluminum) to open or close its circuit based on temperature changes. The excitation is then converted to a voltage signal by the thermistor and the main control board converts the measured voltage to temperature.
The main control board provides an excitation voltage (+5v) to the thermistor with a 2-wire connection (this is because the thermistor change in resistance is large compared to the resistance of the leads).
Thermistors used in GE refrigerators are made up of NTC (sintered metal oxides ceramic made of manganese, nickel, cobalt and other elements), combined with binders and stabilizers then pressed into a precise shape to dictate their resistance and temperature curve.
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