Microwave stops heating shortly after start or will not heat at all; display shows E02.

Safety warning: The high-voltage section (magnetron, capacitor, transformer, diode) can be lethal. If you are not experienced with microwave HV systems, do not attempt internal repairs. Always unplug the appliance and allow it to sit for at least 30 minutes before any inspection.

Basic user checks:

• 1. Verify ventilation: Ensure the microwave has proper clearance as specified in the IKEA installation manual. Blocked vents can cause magnetron overheating and E02. Remove any obstructions from top, sides, and rear vents.
• 2. Check cooling fan operation: Start the microwave with a cup of water. Listen for the internal cooling fan. If the fan is not running, the magnetron can overheat and trigger E02.
• 3. Inspect air filters (built-in/over-oven models): For integrated IKEA microwaves with recirculation, remove and clean the grease filters and check any charcoal filter. Clogged filters restrict airflow.

Technical checks (for trained persons only):

• Remove the cabinet and visually inspect the magnetron for burn marks or cracks.
• Check the high-voltage diode and capacitor with appropriate test procedures and a meter rated for the task.
• Verify that the cooling fan motor receives power when the unit is running.

Resolution: If ventilation and fan are fine, the magnetron or HV components are likely defective and should be replaced as a set with OEM-compatible parts.