E20
Bertazzoni
Internal Overtemperature / Cabinet Thermal Sensor Fault
Microwave displays E20 and the unit becomes unresponsive after a long cooking cycle.
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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
Tripped internal thermal sensor on chassis, Blocked external vents, Failed internal cooling fan, Defective chassis thermal sensor
How to Fix / Troubleshooting
Safety first: Unplug the microwave and allow it to cool fully before inspection.
- Step 1 – Allow cooling: Leave the door open and wait at least 30–60 minutes. After cooling, plug the unit back in and see if E20 clears.
- Step 2 – Check installation: Verify that the microwave is installed with the clearances specified by Bertazzoni and that cabinet cutouts do not block airflow.
- Step 3 – Clean vents and filters: Remove grease and dust from intake and exhaust vents and clean or replace filters on over-the-range models.
- Step 4 – Inspect internal fan and sensor (advanced): With power disconnected and cover removed, check that the internal cooling fan runs freely and that the chassis thermal sensor is securely mounted and wired.
- Step 5 – Replace faulty parts: Replace the internal cooling fan or chassis thermal sensor if they test defective.
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Repair Difficulty
Hard
4/5
Required Part
Chassis Thermal Sensor
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