E12
Siemens
Cavity Temperature Sensor (NTC) Fault
Microwave shows E12 and may continue to run the fan after cooking or refuse to start.
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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 NTC sensor, damaged sensor wiring, failed main control board input circuit
How to Fix / Troubleshooting
Safety warning: Internal sensors are near hot surfaces and live wiring. Only perform external checks unless trained.
Steps to try:
- 1. Allow cooling: Let the microwave cool completely with the door open, then disconnect and reconnect power.
- 2. Avoid extreme use: If E12 appears after repeated long cooking cycles, reduce back-to-back usage to prevent excessive cavity temperatures.
- 3. Test basic heating: Try a short 30-second heating cycle. If E12 appears immediately, the sensor circuit is likely faulty.
- 4. Technician-level: Access the cavity NTC sensor (often mounted on the cavity wall or top), measure its resistance at room temperature, and compare to Siemens specifications. Replace the NTC sensor or main control PCB as indicated.
Do not bypass temperature sensors; they are critical for preventing overheating.
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Repair Difficulty
Hard
4/5
Required Part
Cavity Temperature Sensor (NTC)
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