Frigidaire Washer Error Code F02

The F02 error code on a Frigidaire washer indicates a water temperature problem detected by the machine's control board. The water temperature sensor, sometimes called a thermistor, is a resistive component that monitors the temperature of the incoming water and the water inside the drum during a cycle. The control board uses this sensor's resistance reading to regulate water temperature and ensure cycles run within the correct thermal parameters. When the sensor's resistance falls outside the acceptable operating range, the board flags an F02 fault and halts or disrupts the cycle.

The diagnostic threshold for this sensor is well defined. A properly functioning water temperature sensor should measure between 3,000 ohms (3K) and 163,000 ohms (163K) of resistance. A reading below 3K suggests the sensor has shorted internally, while a reading above 163K indicates an open circuit or a fully failed sensor. Either condition will trigger the F02 code. Before testing the sensor electrically, it is important to confirm that both hot and cold water supply hoses are connected to the correct inlet valves and that the water supply valves are fully open, since improper connections can cause the control board to see unexpected temperature conditions.

Beyond a faulty sensor itself, the wiring harness leading to the sensor is a common culprit. Corroded terminals, pinched wires, or loose connectors can all produce resistance readings outside the valid range even when the sensor element is intact. If the hoses check out and the sensor resistance is within spec, inspecting the wiring between the sensor and the control board is the logical next step.