Chamberlain
Backdrive or Travel Overrun
Garage door closes and then immediately opens a few inches and stops.
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Possible Causes
Down limit set too far, Door hitting floor and bouncing, Loose chain/belt causing overshoot, Worn travel module
How to Fix / Troubleshooting
Safety first: Keep clear of the door while adjusting limits. Use small adjustments and test frequently.
Steps to fix:
- Reduce down travel: Adjust the DOWN travel limit so the door just contacts the floor without compressing the seal excessively.
- Check chain/belt tension: Tighten to Chamberlain specifications to reduce slack and overshoot.
- Reprogram travel: Perform a full travel setup to recalibrate open and close positions.
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Repair Difficulty
Easy
2/5
Required Part
Travel Module / Drive Chain or Belt
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