Ceiling-mounted chain-drive garage door opener with its rail

Generic photo: Dave Dugdale · CC BY-SA 2.0

Setting garage door opener travel limits by model family (LiftMaster/Chamberlain button and screw types, Genie)

How you set the open and close positions depends on the opener generation. Older LiftMaster/Chamberlain units use UP and DOWN limit screws on the motor head (about 2 inches of travel per full turn). Security+ 2.0 era units (roughly 2011 on) use a black adjustment button plus the UP/DOWN arrows. Genie button units use the UP/DOWN arrows and a SET/PRGM button with blue LEDs; Genie screw drives use limit clamps on the rail. After any change, run the reversal and photo-eye tests. Never 'fix' a door that will not close by turning up force.

Cross-checked ~30 min easyBrands: LiftMaster, Chamberlain, Craftsman, Genie

Before you start

Before setting limits, check door balance with the opener disconnected; an unbalanced door may not reverse when it should. Springs, cables, pulleys and brackets are under high tension: do not loosen or adjust them; that is trained door-technician work.
Keep people, pets and vehicles out of the door path while testing.
After any limit change, the door must reverse on a 2x4 laid flat at the center of the opening and on a broken photo-eye beam. If it does not, take the opener out of service until fixed.

Diagnostic steps

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