WR55X10025 Refrigerator Temperature Sensor AP3185407, PS304103

How many temperature sensors does my GE refrigerator have?

The number of sensors varies by model. Many GE French door and side-by-side refrigerators use two or three WR55X10025 sensors — one in the fresh food compartment, one in the freezer, and sometimes one on the evaporator coil. Check your model's parts diagram or contact our support team with your model number to confirm how many you need before ordering.

What is a thermistor and how does it work?

A thermistor is a type of resistor whose electrical resistance changes with temperature. The main control board sends a small voltage through the thermistor and measures the resistance — a higher resistance means a lower temperature, and a lower resistance means a higher temperature. The board uses this reading to decide when to run the compressor and fans to maintain the set temperature. A failed thermistor sends incorrect readings, causing the refrigerator to over-cool, under-cool, or malfunction during defrost cycles.

Can a faulty temperature sensor cause the refrigerator to not defrost?

Yes. On models where the WR55X10025 also serves as the defrost sensor on the evaporator coil, a faulty sensor can cause the control board to incorrectly time or skip defrost cycles entirely — leading to excessive frost or ice buildup on the evaporator coils. This frost buildup can eventually block airflow and cause both the refrigerator and freezer sections to warm up.

How do I know if my temperature sensor is the cause of my cooling problem?

The most reliable way to test the thermistor is with a multimeter. Disconnect the sensor and measure its resistance at room temperature — a working WR55X10025 should read approximately 16,000 ohms at 32°F, dropping as temperature increases. An open circuit (infinite resistance) or short circuit (zero resistance) reading confirms the sensor has failed. If resistance is within the normal range but the refrigerator still has issues, the control board or other components may be at fault.

Is this an OEM or aftermarket part?

This is an aftermarket replacement part built to OEM-equivalent quality standards. It is not a genuine GE OEM part, but is manufactured from durable plastic to match the dimensions and performance specifications of the original WR55X10025 temperature sensor.