Microwave displays H97 and does not heat; fan and light may still operate.

Critical safety warning: H97 indicates a high-voltage system fault. The inverter and magnetron operate at lethal voltages. Do not attempt to test or handle these components unless you are trained and have proper tools.

• Basic reset: Unplug the microwave for 10–15 minutes, then plug back in and test. If H97 reappears immediately when starting a cook cycle, a hardware fault is present.
• Inspect wiring (visual only): With power disconnected, remove the outer cover and visually inspect the wiring between the control board, inverter, and magnetron. Look for burned connectors, loose plugs, or obvious damage. Do not touch the capacitor terminals.
• Check cooling and vents: Ensure that vents are clear and that the cooling fan operates (if you previously noticed overheating or shutdowns). Overheating can trigger inverter faults.
• Professional diagnosis: In most cases, either the inverter module or magnetron must be tested under load and replaced. This should be done by an authorized Fisher & Paykel technician due to the risk of electric shock and radiation leakage.