GE
No Heat – High-Voltage System Failure
Microwave runs but does not heat food; turntable, light, and fan operate normally but food remains cold.
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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 diode, Open high-voltage capacitor, Faulty high-voltage transformer or inverter board
How to Fix / Troubleshooting
Extreme danger: The high-voltage section (transformer, capacitor, diode, magnetron, inverter) can store lethal voltage even when unplugged. Do not attempt to access or service these components unless you are a trained technician.
- Basic checks only: Verify that the timer is set correctly and that you are not in a non-heating mode (e.g., timer or vent fan only).
- Listen during operation: If the microwave is unusually quiet (no typical humming) or makes loud buzzing, note this for the technician.
- Do not continue use: Operating a microwave that does not heat can further damage components.
- Professional service: A GE-qualified technician should test the magnetron, high-voltage diode, capacitor, transformer, or inverter board and replace the failed part.
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Repair Difficulty
Professional Required
5/5
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