F5
BlueStar
Control Board Relay or Internal Logic Fault
Control panel displays F5 and oven functions are disabled or erratic.
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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 EOC, Internal EOC logic error, Power surge damage, Loose neutral or line connection at control board
How to Fix / Troubleshooting
Safety first: Disconnect power at the breaker. Verify no voltage is present before touching wiring.
- Power cycle: Turn off the breaker for 10 minutes to fully discharge the control. Restore power and check if F5 returns.
- Inspect wiring to EOC: Remove the backguard or front panel to access the EOC. Check that all line (L1, L2), neutral, and ground connections are tight and not discolored or burned.
- Check for visible damage: Look for burnt spots, cracked solder joints, or swollen components on the EOC. Any visible damage indicates the board should be replaced.
- Replace EOC: If the error persists after power cycling and wiring checks, replace the EOC with the correct BlueStar part. Transfer wires one at a time to the new board, matching terminal labels.
- Surge protection: Consider using a surge protector or whole‑home surge protection to prevent future control board failures.
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Repair Difficulty
Hard
4/5
Required Part
Electronic Oven Control (EOC)
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