Bertazzoni
No-Heat Condition (Magnetron / High-Voltage Failure)
Microwave runs but does not heat food; timer counts down, light and turntable work normally.
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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 magnetron, Defective high-voltage transformer or inverter, Open high-voltage diode, Open high-voltage capacitor
How to Fix / Troubleshooting
Critical safety warning: High-voltage components can be lethal. Only qualified technicians should service the magnetron and associated circuitry.
- Step 1 – Confirm symptom: Place a cup of water in the microwave and run on full power for 1–2 minutes. If the water remains cold, heating is not occurring.
- Step 2 – Basic checks: Ensure you are not using metal containers or foil that can interfere with heating. Try a different microwave-safe container.
- Step 3 – Stop repeated testing: Avoid repeatedly running the unit with no heating, as this can further damage components.
- Step 4 – Professional repair: Have an authorized Bertazzoni technician test the magnetron, transformer/inverter, diode, and capacitor and replace the failed part(s).
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Repair Difficulty
Professional Required
5/5
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