Whirlpool · Dryer
Whirlpool Dryer F24 Error Code
Inlet thermistor open at high-limit thermostat
What this error means
F24 means the inlet thermistor integrated into the high-limit thermostat assembly reads open. This sensor tracks incoming air temperature before it passes the heating element.
How F24 is detected
F24 on Whirlpool dryer units indicates the drive system did not meet expected performance. Direct-drive washers monitor rotor position with a hall sensor; dryers and dishwashers track motor current draw. When the drum or spray arm fails to turn, the inverter or motor relay shuts down to prevent burned windings. Whirlpool WED5100HC, Whirlpool WED5620HW, and similar variants may show this fault after an overloaded tub or a foreign object jam.
Inlet thermistor wire broken at the high-limit thermostat is a leading trigger. Start with unplug the dryer and access the heater housing on the blower outlet. Rotate the drum or spray arm by hand when powered off—it should move without grinding. Grinding confirms mechanical obstruction; free rotation with repeated F24 on light loads suggests hall sensor, motor, or inverter board failure requiring professional diagnosis.
Common causes
- Inlet thermistor wire broken at the high-limit thermostat
- Connector vibrated loose on the heater housing
- Failed inlet thermistor inside the thermostat assembly
- Thermal fuse blowing and taking the thermistor circuit offline
Step-by-step fixes
- 1Unplug the dryer and access the heater housing on the blower outlet
- 2Locate the high-limit thermostat with the inlet thermistor pigtail
- 3Measure thermistor resistance—Duet docs expect roughly 50,000 ohms at room temperature
- 4Replace the high-limit thermostat assembly if the inlet sensor reads open
When to call a technician
Gas dryer inlet thermistor replacement sits near the burner tube—use a technician if you are not comfortable working near gas lines.
Affected models
- Whirlpool WED5100HC
- Whirlpool WED5620HW
- Whirlpool WGD5620HW
Prevention & maintenance
- Avoid washing single heavy rugs or shoes that bind the drum; distribute weight evenly to reduce motor strain that precedes F24.
- Record when F24 appears in the cycle and whether it clears after a 60-second power reset on your Whirlpool dryer—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for F24; Whirlpool uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting F24; reversed plugs on pumps and valves cause immediate repeat faults.