Microwave displays E7 and will not start; interior light may come on but no heating or turntable movement.

Critical safety warning: The high-voltage section of a microwave can deliver lethal shocks. Do not attempt to test or replace the inverter, high-voltage diode, capacitor, or magnetron unless you are trained and have proper tools to discharge the capacitor.

User-level actions:

• 1. Power cycle: Unplug the Salter microwave for 15 minutes, then plug back in and test with a cup of water.
• 2. Avoid repeated restarts: If E7 reappears immediately, do not keep trying to start cycles; this can further damage components.

Technician-level actions:

• Check the high-voltage fuse and replace if blown, after identifying and correcting the underlying cause.
• Test the high-voltage diode and magnetron for shorts.
• On inverter-equipped Salter models, test and replace the inverter board if it is not supplying correct power to the magnetron.

Due to the risks involved, E7 faults should generally be handled by a professional microwave technician.