Microwave displays E5 and will not heat; sometimes accompanied by a humming noise stopping quickly.

Critical safety warning: The high-voltage section of a microwave (transformer, capacitor, diode, magnetron) can store and generate lethal voltages. Do not attempt HV repairs unless you are properly trained and equipped to discharge the capacitor safely.

User actions:

• Unplug immediately: If E5 appears with unusual humming or burning smell, unplug the Clatronic microwave at once.
• Do not repeatedly restart: Repeated attempts can worsen internal damage.
• Check outlet and power: Verify the wall outlet is correctly wired and not shared with heavy appliances that may cause surges.

Technician actions (summary only):

• Remove cabinet (unplugged, capacitor discharged).
• Check line fuse and HV fuse for continuity and investigate cause of failure.
• Test HV diode, HV capacitor, and magnetron for shorts.

Recommendation: Due to the risks, E5 faults should be handled by a professional microwave technician.