E11 error; interior fan and lights may work but the compressor cycles abnormally and temperature is unstable.

Safety first: Disconnect power before removing trims or accessing wiring.

Locate the door switch:

• On many Blomberg freezers, the door switch is a magnetic reed sensor embedded in the cabinet frame, with a magnet in the door.
• Some models use a mechanical plunger switch near the top or side of the opening.

Basic checks:

• Open and close the door while observing the interior light. If the light does not change state, suspect the switch.
• Check that the door closes fully and that the magnet (if used) is present and aligned with the sensor location.

Electrical test:

• Access the switch by removing the inner trim or control housing.
• Disconnect the switch and test for continuity while actuating it (closing the door or pressing the plunger). The state should change between open and closed.

Corrective actions:

• Adjust door: If the door is sagging, adjust hinges so the magnet aligns with the sensor.
• Replace switch: If the reed or plunger switch does not change state, replace it with a Blomberg-compatible door switch.
• Repair wiring: Fix any broken or pinched wires in the door frame area.
• If the switch and wiring are good but E11 persists, the main PCB door input circuit may be faulty and require replacement.

Test: Restore power and verify that the interior light and any door-ajar indicators operate correctly and that E11 clears.