Microwave displays F6 and may be completely unresponsive or may not heat.

Critical safety warning: High-voltage components inside a microwave (inverter, transformer, capacitor, magnetron) can store lethal voltages even when unplugged. Do not attempt high-voltage testing unless you are trained and equipped. For most users, this repair should be left to a professional.

• Basic reset: Unplug the microwave for 10 minutes, then plug back in and test. If F6 returns immediately, a hardware fault is likely.
• Check ventilation and thermal cut-outs: Ensure vents are clear. Some F6 faults are triggered by open thermal cut-outs. With power disconnected, locate thermal cut-outs on the magnetron and cavity. Test for continuity with a multimeter. Replace any open thermal cut-out with the correct Fisher & Paykel part.
• Inspect wiring: Look for burned connectors or damaged wires between the control board and inverter or high-voltage section. Repair or replace damaged wiring.
• Inverter and magnetron diagnosis: If thermal cut-outs and wiring are good, the inverter board or magnetron may be defective. These components require specialized testing and should generally be replaced by a qualified technician.
• Professional service recommended: Due to the risk of electric shock and radiation leakage, contact an authorized Fisher & Paykel service center for inverter or magnetron replacement.