Microwave does not heat and displays E03 shortly after pressing Start.
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.
Possible Causes
How to Fix / Troubleshooting
Critical safety warning: The high-voltage section (magnetron, transformer, capacitor, diode) can store lethal voltage even when unplugged. Do not attempt to service these components unless you are a trained appliance technician with proper tools and procedures for discharging capacitors.
- Step 1 – Basic checks: Confirm the unit powers on, the interior light works, and the turntable rotates. If everything appears normal but food does not heat and E03 appears, the fault is likely in the high-voltage system.
- Step 2 – Avoid repeated attempts: Do not repeatedly start the microwave with no heating; this can further damage the high-voltage components.
- Step 3 – Visual inspection only: With power disconnected, you may remove the outer cover to visually inspect for obvious burn marks, melted connectors, or a burnt smell near the magnetron or transformer. Do not touch or disconnect high-voltage parts.
- Step 4 – Professional repair: Contact an authorized Bertazzoni service center. The technician will test the magnetron, transformer, diode, and capacitor with appropriate safety procedures and replace the defective component.
Because of the risk of electric shock and radiation leakage if improperly reassembled, high-voltage repairs on Bertazzoni microwaves should be left to professionals.