Safety first: Unplug the microwave before inspection. Moving parts and high voltage are present inside.

Check external airflow: Ensure that intake and exhaust vents are not blocked by cabinets, walls, or other appliances. Remove any obstructions and provide adequate clearance.
Listen for fan operation: Plug the unit back in and start a short heating cycle. Place your hand near the exhaust vents; you should feel air movement and hear the fan. If E08 appears and no airflow is felt, the fan may not be running.
Clean vents and filters: On some built-in Hansa models, removable filters or grilles can be cleaned. Remove them and wash with warm soapy water, dry thoroughly, and reinstall.
Professional service: If the fan does not run or runs noisily, the cooling fan motor or its wiring/tach feedback circuit may be faulty. A technician should access the fan assembly, test the motor, and replace it if necessary.

Warning: Do not continue to use the microwave with E08 present; inadequate cooling can damage the magnetron and electronics.

Microwave displays E08 and will not start; often related to the cooling fan or airflow system.

Possible Causes