Proline
No Heating – High Voltage System Failure
Microwave runs (light, fan, and turntable operate) but food does not heat at all.
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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, Open high-voltage diode, Defective high-voltage capacitor, Faulty high-voltage transformer or inverter module
How to Fix / Troubleshooting
Critical safety warning: The high-voltage section of a microwave is extremely dangerous. Do not attempt to access or test the magnetron, transformer, capacitor, or HV diode unless you are a qualified technician.
User-level checks:
- Verify that you are using a microwave-safe container and that the load is not extremely small (running nearly empty can damage the magnetron).
- Test with a cup of water for 1–2 minutes. If the water remains cold, the heating system has failed.
- Unplug the microwave and discontinue use to prevent further damage.
Next steps:
- Contact a professional technician to diagnose the magnetron, HV diode, HV capacitor, and transformer/inverter.
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Repair Difficulty
Professional Required
5/5
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