Microwave shows 'H98' and will not heat; may stop shortly after starting.

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.

Possible Causes

Shorted magnetron, Defective high-voltage diode, Failed high-voltage transformer, Inverter fault

High-voltage hazard: Do not open the cabinet or attempt to test HV components without proper training and equipment.

Power reset: Unplug for 10–15 minutes and reconnect. If H98 reappears, internal HV components are likely damaged.
Do not reuse: Avoid repeatedly trying to start the microwave, as this can further damage components.
Professional service: A technician should test the magnetron, HV diode, HV capacitor, transformer or inverter, and replace the failed parts.

Professional Required 5/5

Magnetron / High-Voltage Circuit

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