Microwave trips the household circuit breaker or RCD when starting or during operation.

Safety warning: Repeated tripping indicates a potentially dangerous electrical fault. Do not continue resetting the breaker and attempting to run the microwave.

Steps to try:

• 1. Isolate the issue: Unplug the microwave and reset the breaker. If the breaker holds with the microwave unplugged, the fault is likely in the appliance.
• 2. Inspect cord and plug: Look for visible damage, burns, or melted areas. Do not use the microwave if any damage is found.
• 3. Dry the unit: If the microwave was exposed to excessive moisture (e.g., from a leak above), leave it unplugged and allow it to dry for 24 hours, then test again. If it still trips, internal components are likely damaged.

Internal diagnosis requires insulation resistance testing of the magnetron, capacitor, and wiring. This must be done by a qualified technician.