Fisher & Paykel
Start Circuit / Relay Drive Failure
Microwave display is on and buttons respond, but pressing Start does nothing (no relay click, no fan, no light).
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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
Faulty Start button on keypad, Failed relay on control board, Open door switch in run circuit, Control board logic fault
How to Fix / Troubleshooting
Safety first: Disconnect power before accessing internal components.
- Verify door status: Ensure the display does not show a door error. Open and close the door firmly and try again.
- Test other functions: Try setting the clock or using other keys to confirm keypad responsiveness. If only Start fails, the keypad may be defective.
- Listen for relay click: When pressing Start, listen closely for a faint click from inside. No click suggests the control board is not energizing the relay.
- Inspect door switches: A failed door switch can prevent the control from starting the cook cycle. Test and replace any faulty switches.
- Replace keypad or control board: If door switches are good, the fault is likely in the keypad or control board. Replace the affected component with the correct Fisher & Paykel part.
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Repair Difficulty
Medium
3/5
Required Part
Main Control PCB
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