Fisher & Paykel
No Heat / High-Voltage System Failure
Microwave runs (light and turntable on, fan running) but food does not heat.
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Safety Warning
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.
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Possible Causes
Failed magnetron, Faulty high-voltage diode (non-inverter models), Open high-voltage capacitor, Failed inverter board (inverter models)
How to Fix / Troubleshooting
Critical safety warning: The high-voltage section of a microwave can be lethal. Do not attempt to test or discharge the capacitor unless you are trained.
- Confirm symptom: Place a cup of water in the oven and run on high for 1–2 minutes. If the water remains cold, there is a heating problem.
- Check power level settings: Ensure the power level is set to 100% and not a low setting.
- Listen for magnetron hum: Normally, a soft humming sound is heard when the magnetron is operating. If absent or unusually loud, the magnetron or inverter may be faulty.
- Professional repair recommended: Diagnosis of the magnetron, diode, capacitor, and inverter requires specialized tools and procedures. Contact an authorized Fisher & Paykel service technician for safe repair.
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Repair Difficulty
Professional Required
5/5
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