Whirlpool Washer Error Code F/24

The F/24 error code on a Whirlpool washer indicates a water temperature sensor fault, specifically that the NTC (Negative Temperature Coefficient) thermistor is reading a value outside the acceptable range of 23°F to 217°F (-5°C to 103°C). This fault is triggered during the water-heating step of the WASH cycle, when the control board actively monitors the sensor signal to regulate water temperature. An NTC thermistor works by changing its electrical resistance in response to temperature, and the control board interprets that resistance as a temperature value. When the reading falls outside the defined range, the board flags the circuit as faulty and halts normal operation.

The most common causes involve either the sensor itself or the wiring harness connecting it to the control board. A failed thermistor can read abnormally high or low resistance, sending the control board a value that translates to a temperature outside the valid range. Loose, corroded, or broken connector pins between the sensor and the control board can produce the same out-of-range signal by introducing unwanted resistance or breaking the circuit entirely.

Before replacing any components, the first step is to disconnect power to the washer and inspect the sensor and its wiring connection. This rules out intermittent connection issues that can mimic a failed sensor. If the connections are intact, testing the thermistor's resistance with a multimeter and comparing it against the expected resistance curve for the operating temperature will confirm whether the sensor has failed.