Maytag Dryer Error Code F31

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

1. 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.
2. 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.
3. Run diagnostic mode: enter the dryer’s service/diagnostic cycle (refer to your model’s manual) to capture live sensor readings and error history.
4. 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.
5. 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.
6. 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.
7. 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.
8. 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.
9. Replace the failed part: replace the thermistor, thermostat, wiring harness, or control board as identified by testing. Always use OEM or equivalent parts.
10. Verify repair: after repairs, run multiple cycles with different settings to confirm the F31 does not return and drying performance is restored.

Maintenance / Prevention Tips

• Clean the lint filter before every load to maintain airflow and reduce overheating risk.
• Inspect and clean the dryer vent hose and exterior vent every 3–6 months to prevent blockages.
• Use a rigid metal vent where possible instead of flexible foil or plastic to reduce lint traps.
• Ensure vent runs are as short and straight as possible; long or convoluted vents increase resistance and heat buildup.
• Check the dryer vent flap at the outside wall for proper operation and remove obstructions like bird nests.
• Vacuum lint from the dryer interior and around the blower housing during periodic maintenance (power off and unplug first).
• Inspect wiring and connectors for heat discoloration or fraying during annual checks.
• Avoid overloading the dryer; excessive loads make drying longer and strain sensors and motors.
• Balance loads (don’t dry a single heavy item alone) to help even heating and airflow.
• Use manufacturer-recommended cycle settings for load types to avoid unnecessary high heat usage.
• Replace worn or damaged vent hoses and clamps promptly to maintain a tight, lint-free seal.
• Keep the area around the dryer free of lint and combustible materials to reduce fire risk.
• Schedule professional maintenance if you notice unusual smells, smoke, or repeated error codes.
• When replacing components, use OEM parts or high-quality equivalents to preserve sensor accuracy.
• Consider installing a dryer vent cleaning service annually if you run heavy laundry loads frequently.

FAQs

Conclusion / Safety Notice

When dealing with error code F31, prioritize safety: disconnect power before inspecting or testing internal parts, and don’t bypass safety controls for extended operation. If you detect burning smells, smoke, or visible damage to wiring or the control board, stop using the dryer and contact a certified appliance technician immediately. Electrical work and component replacement can pose shock and fire risks when performed incorrectly.

If you are comfortable with basic diagnostics and have the right tools, you can often identify and replace a faulty thermistor or harness yourself. For intermittent faults, control board symptoms, or anytime you’re unsure, call a professional repair service to ensure safe and permanent repair.