H97
Daewoo Inverter / Magnetron Communication Error

Microwave stops heating and displays H97 (on some inverter Daewoo models)

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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 inverter board, Shorted magnetron, Loose inverter harness, Faulty control PCB inverter drive circuit

How to Fix / Troubleshooting

Critical safety warning: H97 indicates a serious fault in the high-voltage inverter system. Only qualified technicians should service these components.

User-level steps:

  • 1. Power cycle: Unplug the microwave for 10–15 minutes. Plug back in and test with a cup of water. If H97 reappears, internal repair is required.
  • 2. Check installation: Ensure the microwave is not installed in a confined space without ventilation, which can stress the inverter.

Technician-level overview:

  • Inspect inverter board for damage.
  • Test magnetron for shorts.
  • Verify control signals to inverter.

Recommendation: Do not continue using the microwave with H97 displayed. Contact Daewoo service for diagnosis and repair.

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Repair Difficulty

Professional Required 5/5

Required Part

Inverter Power Board
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