Amana
No Heat – High-Voltage System Failure
Microwave runs but does not heat food; turntable and interior light work normally, timer counts down.
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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 transformer or inverter board, Blown high-voltage fuse
How to Fix / Troubleshooting
Safety First: Unplug the microwave. The high-voltage section can store lethal energy even when unplugged. Do not attempt internal high-voltage repairs unless you are trained.
- Basic checks: Confirm you are using microwave-safe cookware and that the door is fully closed. Try heating a cup of water for 1–2 minutes to verify no heating.
- Listen for humming: If the usual deeper humming sound is absent while running, the high-voltage system may not be energizing.
- Check for burning smell: A prior burning odor may indicate a failed magnetron or diode.
- Professional service: Diagnosis involves testing the magnetron, high-voltage diode, transformer/inverter, and HV fuse. These tests require special procedures and should be done by a qualified technician. Replace the failed component(s) with Amana-compatible parts.
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Repair Difficulty
Professional Required
5/5
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