If The door starts to close, then reverses and the opener light blinks.
Then Photo-eye alignment.
The sensors near the floor are out of line or dirty; a clean and re-aim usually restores normal closing.
Springs
Extension springs run along the sides and stretch as the door closes. They should have a safety cable threaded through them so a break does not send steel across the garage. We replace the springs, fit the cables and set them evenly.
Garage Door Roller ReplacementA roller near the top corner is riding on the lip of the track rather than inside it, and the section above leans back a little…
Garage Door Hinge ReplacementEvery time the door goes up there is a sharp pop from the same spot, about a metre off the floor, and the whole door gives a…
Garage Door Track Repair or ReplacementBacking out this morning, the mirror caught the track beside the door.
Garage Door Cable ReplacementAfter years of slushy winters the cables look thinner near the bottom brackets, with rust streaks running down the door where…
Torsion Spring ReplacementAfter pulling the red release cord, you tried lifting the door yourself and it would barely leave the floor.
Extension Spring ReplacementIt is the first hard frost of the year and the door on the old detached garage has stopped halfway, squealing at one pulley.
Garage Door Balance AdjustmentThe door has grown heavy so gradually you stopped noticing, until a visitor tried to lift it and could not.
Which fix fits?
Tap a situation. The answer opens here.
If The door touches the floor and pops back open.
Then Close-limit adjustment.
The opener thinks it hit something; setting the travel limit correctly stops the bounce.
If The door closes but leaves a gap along the bottom.
Then Bottom seal and limit setting.
A compressed seal or a short travel limit leaves daylight; both are simple to correct. Garage Door Bottom Seal Replacement