FixByModel
F24

Whirlpool F24: Inlet thermistor open — resistance too high

F24 indicates the inlet (heat source) thermistor reads open or abnormally high resistance, so the control loses its inlet temperature reading. The companion F25 code is the same sensor reading shorted (too low).

May need a technician

By the FixByModel editorial team · Verified 2026-09 · Researched against manufacturer support & repair references (below)

Most likely causes

  1. Failed or out-of-spec inlet thermistor
  2. Broken or pinched wire in the thermistor harness
  3. Loose or corroded sensor connector
  4. Heat or lint damage near the inlet housing
  5. Faulty main control board (less common)
The heat circuit — check in this order
1Thermal fuse
2Heating element
3Cycling thermostat
4Thermistor
5Control board

Schematic illustration of a typical dryer — not your exact model.

Before you start — unplug the dryer, and on a gas model shut off the gas supply. Let it cool first — the drum, heater and exhaust can be hot. If a step involves the heating element, wiring, or opening the cabinet and you're unsure, stop and call a qualified technician.

Step-by-step fix

1Cut the powerUnplug the dryer or switch off its breaker before accessing the inlet thermistor.
2Find the inlet sensorLocate the inlet thermistor near the heater/burner inlet area.
3Inspect connectionsCheck the harness and connector for damage or corrosion and reseat as needed.
4Test the thermistorMeasure resistance with a meter; an open or very high reading confirms a failed sensor.
5Replace if faultyFit a new inlet thermistor if it fails the resistance check.
6Confirm operationReassemble and run a heated cycle to verify the fault does not return.

Still showing F24?

If you’ve worked through every step and F24 keeps returning, an internal part likely needs testing and replacement. That’s a job for a qualified appliance technician, who can measure the suspect part against the service-manual spec before replacing it.

Which models this applies to

Whirlpool dryers. Whirlpool numbered-code HE dryers (e.g. Duet); F24 = inlet thermistor open, F25 = inlet thermistor shorted.

FAQ

What does Whirlpool F24 mean?

Inlet thermistor open — resistance too high. F24 indicates the inlet (heat source) thermistor reads open or abnormally high resistance, so the control loses its inlet temperature reading. The companion F25 code is the same sensor reading shorted (too low).

What causes Whirlpool F24?

The most likely cause is failed or out-of-spec inlet thermistor. Other causes include Broken or pinched wire in the thermistor harness; Loose or corroded sensor connector; Heat or lint damage near the inlet housing; Faulty main control board (less common).

Can I fix Whirlpool F24 myself?

Some checks are DIY, but this code often points to an internal component, so it may need a qualified technician.