GE · Microwave error code

H97 / H98 / H99Magnetron / inverter circuit fault

Cross-checked High-voltage / caution

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OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work.

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Microwave runs but does not heat

No heat means the high-voltage circuit is not producing microwaves: HV fuse, HV diode, HV capacitor, magnetron, HV transformer, a door switch, or (on inverter models) the inverter board. Every internal test is high-voltage work for trained techs only, with the cord unplugged and the HV capacitor discharged and verified.

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Microwave trips the house breaker or GFCI

Separate a supply problem (shared or undersized circuit, GFCI nuisance trips) from an internal short. Internal shorts in the HV section usually blow the internal fuse; a trip on start can also come from a shorted HV component.

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GE microwave error H97 / H98 / H99: Magnetron / inverter circuit fault · OnCall Tech