Microwave stops heating and displays H97; fan and turntable may still operate.

Critical safety: Inverter-based microwaves operate at very high voltages and frequencies. Only trained technicians should service the inverter and magnetron. Do not attempt live testing without proper training and equipment.

Basic user checks:

• Unplug the microwave for 10 minutes and then plug it back in to see if H97 clears.
• Ensure the unit is properly ventilated and not overheating.

Technician-level checks:

• Remove the outer cabinet and visually inspect the inverter board for burnt components or cracked solder joints.
• Check all high-voltage connections between the inverter and magnetron for tightness and signs of arcing.
• Test the magnetron for shorts to ground and proper filament continuity.
• If the magnetron tests good, the inverter board is the most likely failure point.

Corrective actions:

• Replace a shorted magnetron with the correct Magic Chef-compatible part.
• Replace a failed inverter board with the exact replacement specified for the model.

Note: After inverter or magnetron replacement, a microwave leakage test and functional test should be performed.