Maytag Dryer F23 Error Code — What It Means
The F23 code on a Maytag dryer indicates the main control has detected a fault in the exhaust or outlet thermistor circuit. This is the sensor that monitors exhaust air temperature, and the code appears when the control reads an open circuit, short, or out-of-range value from that sensor or its wiring. It is not a generic heater failure but a specific problem in the temperature-sensing circuit running through the control’s P4 connector.
Maytag’s product help instructs you to power-cycle the dryer and retest with a timed dry cycle to see if the code returns. If it does, the fault is real and requires inspection of the exhaust thermistor, its harness, or the control board.
Common Causes
- Failed exhaust or outlet thermistor The sensor itself has failed open, short, or out of specification and sends an invalid signal to the control.
- Loose, corroded, or damaged wiring and connectors The harness between the thermistor and the main control board is intermittent, corroded, or physically damaged.
- Main control board failure The control board’s thermistor input circuit has failed even though the sensor and wiring test correctly.
- Thermal damage from poor airflow Restricted exhaust airflow or overheating can damage the thermistor or its connectors over time, triggering the fault.
Step-by-Step Fix
- Disconnect power at the circuit breaker and wait one minute, then restore power and start a timed dry cycle to confirm whether the F23 code returns.
- Unplug the dryer and access the exhaust thermistor by removing the rear or top panel, depending on your model, and locate the thermistor mounted near the exhaust outlet or blower housing.
- Inspect the thermistor and its wiring harness for physical damage, loose terminals, corrosion, or signs of heat damage at the connector.
- Disconnect the thermistor harness at the control board (connector P4) and use a multimeter to measure resistance across the thermistor leads, expecting approximately 10,000 ohms at room temperature.
- Replace the exhaust or outlet thermistor if the resistance reading is open, shorted, or far out of range, and repair or replace any damaged connectors or wiring.
- If the thermistor and wiring test good, replace the main control board, as the fault lies in the board’s thermistor input circuit.
- Reassemble the dryer, restore power, and run a full timed dry cycle to verify the F23 code does not return and heating operates normally.
Parts Often Needed
| Part | Notes |
|---|---|
| Exhaust or outlet thermistor | Amazon | The temperature sensor monitoring exhaust air, the most common F23 cause. |
| Main electronic control board | Amazon | Replace if thermistor and wiring test correctly but the fault persists. |
| Wire harness or connector terminals | Amazon | Repair or replace if heat-damaged, corroded, or intermittent between thermistor and control. |
When to Call a Pro
Call a technician if you are uncomfortable working inside the dryer cabinet with electrical components, if the multimeter test results are unclear, or if the code returns after you have replaced the thermistor and verified the wiring. Control board replacement requires careful handling and model-specific reassembly, and a qualified service provider can also confirm the exact thermistor specification and connector pinout for your dryer model.