Microwave runs for a few seconds, then stops and shows E2 on the display.

Safety warning: Always unplug the microwave before removing the cabinet. The high-voltage capacitor can store lethal charge; do not touch or service the HV section unless properly trained.

• Step 1 – Check ventilation: Ensure the microwave has adequate clearance on all sides as specified in the Bomann manual. Clean any dust or grease from the rear and side vents. Do not operate the unit built-in or enclosed unless it is designed for that.
• Step 2 – Listen for cooling fan: Start a short heating cycle with a cup of water. Listen for the internal cooling fan. If the fan does not run, stop the cycle immediately to avoid overheating.
• Step 3 – Access thermal cut-out: Unplug the unit and remove the outer cabinet. Locate the magnetron (large finned component) and its thermal cut-out (small disc-shaped thermostat or fuse clipped to the magnetron or nearby waveguide).
• Step 4 – Test thermal cut-out: Disconnect one lead and test for continuity with a multimeter. A normally closed thermal cut-out should show continuity at room temperature. If open, replace it with the exact temperature rating specified for your Bomann model.
• Step 5 – Check cooling fan: Spin the fan blades by hand to ensure they move freely. Test the fan motor for continuity and inspect wiring. Replace the fan motor if open or seized.
• Step 6 – Reassemble and test: After replacing faulty parts, reassemble the cabinet, ensuring airflow paths are clear. Test with a short heating cycle. If E2 persists, the magnetron itself may be overheating or the control PCB may be misreading the sensor; contact a professional.