E4
Bauknecht
Overtemperature Protection Triggered
Microwave displays E4 and will not start; sometimes appears after overheating.
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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 cavity thermal cut-out, Blocked ventilation, Failed cooling fan, Faulty temperature sensor
How to Fix / Troubleshooting
Safety first: Unplug the microwave and allow it to cool completely.
- Step 1 – Allow cooling: Leave the door open and wait at least 30 minutes, then reconnect power and test.
- Step 2 – Check ventilation: Ensure there is sufficient clearance around the unit and that vents are not blocked by cabinets or objects.
- Step 3 – Clean filters and vents: Remove and clean any grease filters; vacuum dust from intake/exhaust grills.
- Step 4 – Verify fan operation: Start a short cycle and confirm that the internal cooling fan runs. If not, the fan motor or control is faulty.
- Step 5 – Professional inspection: A technician should test the cavity thermal cut-out and cooling fan motor, replacing any open or failed components.
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Repair Difficulty
Hard
4/5
Required Part
Cavity Thermal Cut-Out
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