Microwave does not heat; display shows E5 shortly after pressing START.

Critical safety warning: High-voltage components in a microwave (transformer, capacitor, diode, magnetron) can be lethal. Only qualified technicians should work on the high-voltage section. Do not attempt HV repairs without proper training and tools.

User-level checks:

• 1. Power reset: Unplug the microwave for 10–15 minutes to allow internal protection circuits to reset. Plug back in and test with a cup of water. If E5 reappears immediately, an internal HV fault is likely.
• 2. Check for burning smell or noise: If you previously noticed a burning smell, loud humming, or popping noises when heating, mention this to the technician; it helps pinpoint whether the transformer, capacitor, or magnetron is failing.
• 3. Inspect exterior: Ensure the power cord and plug are undamaged and that the outlet is properly grounded.

Technician-level outline (for reference only):

• Discharge the high-voltage capacitor safely.
• Test the HV diode, capacitor, and transformer windings with a multimeter.
• Check magnetron continuity and for internal shorts to chassis.
• Replace any failed HV component with a Morphy Richards-compatible part.

If E5 persists, the control PCB or inverter board (on inverter models) may need replacement.