
Door stops short or reverses at the floor (travel limits and force)
Usually travel limits or force need reprogramming, or the door is binding/out of balance. Test the door by hand first.
Before you start
- Do not raise force to overcome a binding door; fix the door instead.
- After any adjustment, run the reversal test with a 2x4 laid flat in the doorway.
- If the door is heavy, will not stay put, or a spring/cable looks broken: stop and refer to a trained door technician. Never touch torsion springs, cables, drums or bottom brackets.
Diagnostic steps
Unlock all 4 steps with expected values
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