How to Fix Kenmore Dryer Error F21

⚠️ Safety Warning: Appliance repair involves electricity, gas, and moving parts. Always disconnect power before working on any appliance.

Error Code: Dryer Difficulty: Moderate

Problem: Temperature sensor failure – heater overheating

⚖️ Repair Decision
✅ WORTH FIXING

Parts under $100

How to Fix Dryer Error

  1. Turn off power supply immediately.
  2. Allow dryer to cool completely.
  3. Remove rear access panel.
  4. Locate thermistor sensor on heater assembly.
  5. Disconnect electrical connector from sensor.
  6. Test sensor resistance with multimeter.
  7. Inspect high limit thermostat and thermal fuse for continuity.
  8. If sensor is faulty, remove mounting screws and replace sensor.
  9. Check heater element for short circuits or grounding issues.
  10. Restore power and test heating cycle with temperature monitoring.

Recommended Replacement Part

OEM Part #: WP3391270

Estimated Market Price: $85

Check Price & Availability →

Still Not Working?

If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.

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Most DIY parts are $50–$250. If you have a quote, use the total.
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Expert: Mike Sullivan

EPA Section 608 Certified Technician with 18+ years experience.

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