6-3
Chamberlain Safety Reversal Triggered by Excessive Force

Door closes then immediately reverses and opens fully; logic board LED flashes 6 times, pause, then 3 times (6-3).

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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

Door binding near floor, Weather seal too thick, Uneven floor, Force setting too low for door weight

How to Fix / Troubleshooting

Safety first: Verify the door is structurally sound. Do not defeat safety reversal by setting force excessively high.

Steps to fix:

  • Inspect bottom seal and floor: Check if a new or stiff bottom seal is causing extra resistance. Ensure the floor is reasonably level.
  • Check for binding near closed position: Move the door by hand and feel for resistance in the last foot of travel. Correct any track or roller issues.
  • Increase down force slightly: Turn the DOWN force adjustment up in small increments until the door closes without reversing, while still passing the 2x4 safety test.
  • Re-test safety reversal: Place a 2x4 under the door and confirm it reverses on contact.
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Repair Difficulty

Medium 3/5

Required Part

Force Adjustment Potentiometer
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