Bush
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, Failed high-voltage diode, Failed high-voltage capacitor, Faulty high-voltage transformer
How to Fix / Troubleshooting
Critical safety warning: The high-voltage section can be lethal. Unplug the microwave and do not attempt HV repairs unless you are trained.
- Confirm symptom: Place a cup of water in the centre and run on full power for 1–2 minutes. If the water remains cold, heating is not occurring.
- User-level checks: Ensure you are not using metal containers or foil. Check that the power level is set to 100% and that the timer is not on a very short duration.
- Professional diagnosis: A technician will test the magnetron, HV diode, capacitor, and transformer with the capacitor safely discharged. Any failed component must be replaced with the correct Bush-specified part.
Because of the risk of electric shock and radiation leakage, this repair is best left to a qualified appliance engineer.
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Repair Difficulty
Professional Required
5/5
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