Whirlpool Dryer F23 Error Code — What It Means
The F23 error code on Whirlpool dryers (especially Duet and HE models) is a drying system air-temperature fault tied to the outlet thermistor or outlet temperature sensing circuit. The control board is not receiving the expected exhaust temperature signal, which prevents the dryer from running normally. This is not a simple overheat warning. It means the thermistor itself, its wiring, or the control board input has failed. Whirlpool’s first-line recovery is a power reset followed by a timed dry retest to see if the fault clears.
Common Causes
- Failed outlet thermistor The outlet temperature sensor has gone open, shorted, or out of range and no longer sends a valid signal to the control.
- Loose or corroded wiring connector The thermistor plug or harness terminals have oxidized, loosened, or separated, breaking the circuit to the control board.
- Damaged wire harness The wiring between the thermistor and control board is pinched, frayed, or shorted, causing an intermittent or permanent open circuit.
- Control board input failure If the thermistor and harness test correctly, the control board’s temperature sensing circuit may have failed internally.
Step-by-Step Fix
- Turn off power at the breaker for at least five minutes, then restore power and run a timed dry cycle to see if the error clears (Whirlpool’s published reset procedure).
- Disconnect power again and unplug the dryer or switch off both breakers (many dryers use two) before opening any panels.
- Access the outlet thermistor by removing the top or rear panel (location varies by model, but the outlet thermistor is typically near the exhaust duct or blower housing).
- Inspect the thermistor connector and wiring for loose terminals, corrosion, or physical damage, and reseat or clean the plug if needed.
- Measure the thermistor resistance at room temperature with a multimeter (technician references suggest around 10 kΩ, but consult your model’s service sheet for exact values), and check for open or shorted conditions.
- Replace the outlet thermistor if it reads open, shorted, or significantly out of range, then reassemble and retest with a timed dry cycle.
- Check harness continuity and the control board if the thermistor tests good but the error persists, and replace the harness or control as needed.
Parts Often Needed
| Part | Notes |
|---|---|
| Outlet thermistor (outlet temperature sensor) | Amazon | Most common fix. Match your dryer model number. |
| Dryer wire harness (thermistor to control) | Amazon | Only if wiring is pinched, cut, or corroded beyond repair. |
| Electronic control board | Amazon | Replace only after thermistor and harness test good but fault remains. |
When to Call a Pro
Call a technician if the power reset does not clear the code and you are not comfortable working inside the dryer cabinet, using a multimeter, or interpreting resistance values. If you replace the thermistor and harness but the F23 persists, the control board is the likely culprit and requires professional diagnosis to avoid replacing the wrong part. Always call a pro if you have any doubt about electrical safety or if your dryer uses gas (gas supply work requires a qualified technician).