F5
Sharp
Relay drive or watchdog failure on control board
Sharp oven displays F5 and may not start or may stop during operation.
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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 relay on electronic control board, control board logic fault, power supply instability, overheated control board
How to Fix / Troubleshooting
Safety: Turn off power at the breaker before removing the control panel.
- Power cycle: Remove power for 10 minutes, then restore. If F5 returns immediately, suspect the control board.
- Ventilation check: Ensure the oven's control area cooling vents are not blocked. Overheating can cause control faults.
- Inspect control board: Access the EOC and inspect for burnt relay contacts, darkened PCB areas, or cracked solder joints. Any visible damage requires replacement.
- Check supply voltage: If you have a multimeter and are qualified, verify that line voltage at the oven terminal block is stable and within spec (typically 220–240V AC for EU/Asia, 208–240V AC for US). Large fluctuations can damage the board.
- Replace EOC: If F5 persists and no external cause is found, replace the electronic control board with the Sharp-approved part.
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Repair Difficulty
Hard
4/5
Required Part
Electronic Control Board (EOC)
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