4-4
Chamberlain
Internal Logic Board Fault
Opener operates erratically; logic board LED flashes 4 times, pause, then 4 times (4-4).
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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
Microcontroller failure, Power supply instability, Corrupted firmware, Lightning or surge damage
How to Fix / Troubleshooting
Safety first: Disconnect power before handling the opener. Use a surge protector on the outlet to prevent future damage.
Steps to fix:
- Power reset: Unplug the opener for at least 1 minute, then plug it back in and test operation.
- Check power source: Verify the outlet provides stable voltage and is not controlled by a wall switch. Avoid using long extension cords.
- Inspect board: Remove the light lens and cover. Look for obvious damage such as burn marks or leaking capacitors.
- Replace logic board: If the 4-4 code persists and other components (sensors, motor, wiring) test good, replace the logic board with the exact Chamberlain part number for your model.
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Repair Difficulty
Hard
4/5
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