Maytag Dryer Error Code F31 — What It Means
The Maytag dryer error code F31 typically points to a problem with the dryer’s temperature sensing circuit — most often the thermistor (temperature sensor) or its related wiring and control circuitry. When the dryer cannot read or regulate temperature correctly, the machine may stop heating, run longer-than-normal cycles, or display intermittent faults. Besides longer drying times and poor drying performance, an unresolved F31 can create safety risks (overheating in rare cases, repeated electrical faults) and can accelerate wear on other components like the heating element or motor.
Common Causes
- Faulty thermistor / temperature sensor (open, shorted, or out-of-spec)
- Loose, corroded, or damaged wiring harness or connector in the sensor circuit
- Defective main control board (PCB) that misreads sensor input or won’t process it
- Failed high-limit thermostat or cycling thermostat causing inconsistent temperature readings
- Blocked or restricted venting causing abnormal temperature behavior and triggering the error
- Intermittent connector contact due to lint, heat damage, or vibration
- Firmware or electronic glitch (less common) that requires control board reset or replacement
Troubleshooting Steps
- Reset the dryer: unplug it or switch off the breaker for 1–5 minutes, then restore power to clear transient errors and see if F31 returns.
- Check venting and airflow: disconnect the vent from the dryer, run a short cycle and confirm strong airflow and no lint blockage. A restricted vent can cause abnormal temps and sensor issues.
- Run diagnostic mode: enter the dryer’s service/diagnostic cycle (refer to your model’s manual) to capture live sensor readings and error history.
- Inspect sensor wiring and connectors: visually check the thermistor wiring harness at the drum and at the control board for heat damage, pinched wires, or loose connectors. Reseat connectors and remove lint build-up.
- Test the thermistor with a multimeter: unplug the dryer, locate the thermistor, and measure resistance at room temperature — compare to the service manual spec (typically a few kilo-ohms; exact value varies by model). Large open or shorted readings indicate failure.
- Test thermostats and heating components: check the high-limit and cycling thermostats for continuity; inspect the heating element for shorts or breaks which can affect temperature control.
- Swap or bypass (for testing only): if you have a compatible known-good sensor or harness, swap to confirm the fault. Don’t operate long-term with bypasses that remove safety features.
- Inspect the control board: look for burn marks, bulging capacitors, or heat-damaged solder joints. If the thermistor and wiring test good but F31 persists, the control board may be faulty.
- Replace the failed part: replace the thermistor, thermostat, wiring harness, o