Maytag
No Heat – High-Voltage System Failure
Microwave runs but does not heat food; turntable, light, and fan operate 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, Open high-voltage diode, Failed high-voltage capacitor, Failed high-voltage transformer or inverter
How to Fix / Troubleshooting
Critical safety warning: The high-voltage section of a microwave can store and generate lethal voltages. Do not attempt to test or replace the magnetron, transformer, capacitor, diode, or inverter unless you are trained and have proper tools.
User-level checks:
- Verify that you are using microwave-safe containers and that the door is fully closed.
- Try heating a cup of water for 1–2 minutes. If it remains cold, there is a heating system failure.
Next steps:
- Unplug the microwave and discontinue use until serviced.
- A technician will test the magnetron, high-voltage diode, capacitor, and transformer/inverter and replace the defective component(s).
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Repair Difficulty
Professional Required
5/5
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