Microwave displays E22 and does not heat, though the light and turntable may operate.

Safety warning: High-voltage components can store dangerous charge even when unplugged. Do not attempt to service the high-voltage section unless you are qualified.

User-level actions:

• Power cycle: Unplug the microwave for 10 minutes, then plug back in and test. If E22 returns immediately, an internal component is likely defective.
• Check for burning smell or noise: If you heard humming, buzzing, or smelled burning before the error, discontinue use and leave the unit unplugged.

Technician-level checks:

• Inspect and test the high-voltage inverter board (on inverter models) for burned components or cracked solder joints.
• On transformer-based models, test the high-voltage transformer primary and secondary windings for continuity and shorts.
• Check the high-voltage fuse and HV diode for continuity and shorts.
• Verify that the magnetron is not shorted, as this can cause inverter or transformer failure.

Due to the complexity and safety concerns, replacement of the inverter or transformer should be performed by an Electrolux-authorized technician.