E05
Bertazzoni
Low-Voltage Power Supply / Control Reset Fault
Microwave displays E05 and will not start; sometimes occurs after a power surge or outage.
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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
Unstable AC supply or surge, Failed low-voltage transformer or SMPS on control board, Loose power connector on control PCB, Blown low-voltage fuse on PCB
How to Fix / Troubleshooting
Safety first: Disconnect power before opening any panels.
- Step 1 – Verify outlet and supply: Plug another appliance into the same outlet to confirm stable power. Avoid using lightweight extension cords or power strips; plug the microwave directly into a properly grounded outlet.
- Step 2 – Hard reset: Unplug the microwave for 10–15 minutes. This can clear transient faults in the control electronics.
- Step 3 – Inspect power cord: Check the Bertazzoni power cord for cuts, kinks, or burn marks. Replace the cord if damaged.
- Step 4 – Internal inspection (advanced): With the cover removed and power disconnected, inspect the control board for a small internal fuse or thermal fuse in the low-voltage section. If blown, determine the cause (shorted component) before replacing.
- Step 5 – Replace control board if needed: If the low-voltage section is defective or visibly damaged, replace the main control board.
If E05 recurs after a confirmed good power supply, professional diagnosis is recommended.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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