H99
Kenmore
Inverter Protection or Overcurrent Error
Microwave displays H99 and will not heat; may shut down immediately.
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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
Shorted magnetron, Internal inverter short, Damaged high-voltage wiring, Overload condition detected by inverter
How to Fix / Troubleshooting
Critical Safety Warning: H99 involves the high-voltage inverter system. This is not a user-serviceable area.
- Immediate step: Unplug the microwave and do not attempt further operation.
- Professional diagnosis: A qualified technician will test the magnetron, inverter, and wiring for shorts and replace the failed components.
Do not attempt to bypass safety circuits or continue using the microwave with an H99 error.
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Repair Difficulty
Professional Required
5/5
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