E-21
Kenmore
Cavity Temperature Sensor Error
Microwave displays E-21 and may not start or may stop during sensor cooking.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open or shorted cavity thermistor, Damaged sensor wiring, Loose connector at control board, Failed control board sensor circuit
How to Fix / Troubleshooting
Safety: Disconnect power before removing covers.
- Reset: Unplug for several minutes and retry. If E-21 returns, inspect the sensor.
- Locate sensor: Find the cavity temperature sensor (often a small probe or thermistor behind an interior panel or on the cavity wall).
- Inspect wiring: Check for pinched, burnt, or broken wires. Reseat connectors at both the sensor and control board.
- Replace sensor: If wiring is intact but the error persists, replace the cavity temperature sensor with the correct Kenmore part.
Sensor replacement is moderate difficulty; if you lack tools or access, contact a technician.
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Repair Difficulty
Hard
4/5
Required Part
Cavity Temperature Sensor / Thermistor
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