Kenmore Dryer Error Code F-23

F-23 indicates that the exhaust thermistor has shorted. The exhaust thermistor is a temperature sensor in the dryer's exhaust path that feeds temperature data to the control board. A short in this circuit causes the resistance to read abnormally low, which the control board flags as a fault. The dryer typically stops heating or stops running entirely when this code appears.

It is not recommended to operate the dryer while this fault is active. The exhaust thermistor plays a direct role in monitoring heat levels, and running the dryer without a functioning sensor means the control board cannot accurately detect an overheating condition. Continuing to run the dryer could cause heat-related damage to internal components or create a fire hazard.

If the exhaust thermistor is the failed component, parts typically cost in the range of $10 to $40 depending on the specific model. If professional labor is involved, total repair costs including parts and service generally fall in the range of $80 to $200. Control board replacement, if required, would increase costs significantly and should only be pursued after the thermistor and wiring have been ruled out.

Many technicians and experienced DIYers can resolve F-23 by testing and replacing the exhaust thermistor, which is generally an accessible component. The first step is to perform Test #4a as outlined in the dryer's diagnostic guide, which walks through measuring the thermistor circuit. If the thermistor itself is confirmed shorted and the wiring is intact, swapping the thermistor is a relatively low-difficulty repair requiring basic hand tools.

A power reset may temporarily clear the code, but it will return as soon as the control board reads the thermistor circuit again if the underlying fault has not been corrected. The shorted thermistor or wiring must be repaired or replaced to permanently resolve the error. Resetting without fixing the root cause does not make the dryer safe to use.