E13
SMEG Inverter Module Fault (Inverter Models Only)

Microwave shows E13; fan may run but no heating occurs.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Failed inverter power module, Shorted magnetron drawing excessive current, Faulty inverter control signal from PCB, Overcurrent protection trip

How to Fix / Troubleshooting

Critical safety warning: Inverter-based microwaves operate at very high voltages and frequencies. Do not attempt to service the inverter or magnetron yourself.

User checks:

  • Confirm that the unit is not overloaded with metal cookware or foil, which can cause arcing and stress the inverter.
  • Unplug the microwave for 15–20 minutes to allow the inverter to discharge and reset.
  • Plug back in and test with a single cup of water on full power for 30–60 seconds. If E13 reappears, stop using the unit.

Technician actions:

  • Test the magnetron for shorts and correct filament resistance.
  • Check the inverter module for visible damage and correct output under load.
  • Verify control signals from the main PCB to the inverter.

Due to the complexity and danger, inverter faults should only be handled by an authorized SMEG service technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Inverter Power Module
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