Microwave shows E16 and may intermittently shut off or reset during operation.

Safety first: Unplug the microwave before opening any covers. Mains connections can be lethal.

Step-by-step checks:

• 1. Verify outlet: Test the wall outlet with another high-power appliance or a plug-in tester to ensure stable voltage.
• 2. Avoid extension leads: Plug the Grundig microwave directly into a dedicated wall socket.
• 3. Inspect power cord: Look for cuts, kinks, or burn marks along the cord. Replace if damaged.
• 4. Check internal mains connections: With the cabinet removed, inspect the mains terminal block and line filter board. Tighten any loose screws and look for discoloration or burning.
• 5. Replace line filter if burnt: If the line filter (EMI filter) shows signs of overheating or cracking, replace it with a compatible part.

If E16 continues despite stable mains and sound internal connections, the control PCB may be overly sensitive or damaged and should be replaced by a professional.