Whirlpool Dryer Error Code F-24

F-24 means the control board detected an open circuit in the inlet thermistor, the temperature sensor that monitors incoming air at the start of the heat path. This code only appears during the dryer's built-in diagnostic test mode, not during a normal cycle. It points to a failed thermistor, a broken wire, or a damaged connector in that sensor circuit.

Because F-24 only surfaces in diagnostic mode and not during normal operation, the dryer may continue to run. However, a non-functional inlet thermistor means the control board is missing temperature data it needs to regulate the heating cycle properly, which can lead to overheating or poor drying performance over time. Having the fault repaired before continued regular use is the safer approach.

Since F-24 only appears during diagnostic test mode, power cycling the dryer will exit diagnostic mode and the code will no longer display. However, the underlying open circuit in the thermistor will still be present, and the fault will reappear the next time diagnostic mode is run. A reset does not fix the root cause and should not be used as a substitute for proper diagnosis and repair.

A knowledgeable DIYer can start by running TEST #4a as directed in the diagnostic procedure, which involves checking the thermistor circuit with a multimeter. If the thermistor reads open and needs replacement, the part is generally accessible. Wiring repairs require comfort working with appliance harnesses and connectors. If the control board is suspected, professional diagnosis is recommended.

If only the inlet thermistor needs replacement, parts typically cost in the range of $10 to $40 depending on the specific model, with a service call adding labor costs on top. If the wiring harness or connector is the issue, repair costs vary based on the extent of the damage. A control board replacement, if needed, can run considerably higher, often in the $100 to $300 range for parts alone.