The F24 error means inlet thermistor (incoming air temperature sensor) fault — reading outside expected range.
The Whirlpool dryer displays the F24 error and halts the current cycle until the underlying problem is fixed.
Check these in order. The first cause accounts for the majority of F24 errors.
The inlet thermistor measures incoming air temperature before the heater. It typically fails open-circuit (OL), triggering F24 immediately at cycle start.
Moisture exposure over time corrodes the thermistor connector. Inspect and clean before replacing the sensor — a connector clean can resolve the error.
A lint-blocked inlet duct can cause abnormal temperature readings near the sensor. Clear the inlet and exhaust paths before replacing any components.
If the thermistor tests fine and the connector is clean but F24 persists, the control board's thermistor circuit may be damaged — usually from a prior overheat event.
Follow these in order. Stop as soon as the error clears.
Cut power and disconnect from the outlet.
Clear the full exhaust duct run to the exterior. A blocked duct can damage thermistors over time and is often the root cause.
The F24 inlet thermistor is on the air intake duct inside the dryer cabinet — often near the heating element housing. Refer to your model's wiring diagram.
At room temperature (~70°F), a good Whirlpool dryer inlet thermistor reads approximately 10–15kΩ. OL or 0Ω = replace.
Disconnect the thermistor connector. Look for green corrosion on the pins. Clean with electronics contact cleaner.
Whirlpool inlet thermistors are typically one screw and a connector (~$15–30). Run a short cycle after replacement to verify.
For warranty service, contact Whirlpool support ↗ or a certified appliance technician.