What actually goes wrong with a garage door
A sectional door is a simple machine. Panels ride on rollers, the rollers sit in tracks, hinges join the panels, and a spring system carries the weight so the opener only has to guide the door rather than lift it. When something binds, the noise tells you where. A grinding rumble usually means dry or flat-spotted rollers. A bang at one point in the travel is often a bent track or a loose lag bolt in a track bracket. A shudder near the floor points at a hinge with an elongated pin hole.
Doing nothing is the expensive choice. Every extra kilogram of drag gets passed to the opener motor and the gear inside it, and openers are far dearer than a set of rollers. Most of the garage door repair I get called for in the Greater Toronto Area could have been a tune-up a year earlier.
What a tune-up includes
I work through the whole door rather than only the part that is complaining. A garage door repair that treats one symptom tends to come back, because a door that binds in one place wears everywhere.
- Tighten every hinge, bracket and track lag bolt
- Replace worn, cracked or flat-spotted rollers
- Check track alignment and plumb, then adjust the brackets
- Lubricate rollers, hinges, springs and the opener rail with a proper garage door lubricant
- Balance test the door with the opener disconnected
- Test the auto-reverse on both the sensors and the force setting
- Clean the tracks of grit, road salt and old grease
One note on lubricant. Household spray oil is the wrong product: it strips grease, attracts grit and leaves the door dirtier than it started. A lithium or silicone garage door lubricant belongs on the pivot points and rollers, never on the track face itself, which the rollers need to roll along rather than slide.
Where garage door repair stops and a specialist starts
Spring work is where I stop and hand it over. Torsion and extension springs are under enormous tension and need proper winding bars and training to touch safely. If your door will not stay put halfway when the opener is disconnected, or you can see a gap in the spring coil, that is a spring job and I refer it to a specialist. The same goes for a cable that has jumped its drum, a door that has come fully off its tracks under load, and any hardwired electrical work beyond plugging the opener into an existing outlet. New circuits go to a licensed electrician.
Openers, safety sensors and remotes
Photo-eye sensors sit within about 15 cm (6 in) of the floor on each side and have to face each other squarely. A knocked bracket, a spider web across the lens or a bike leaning on one will stop the door closing and give you the flashing light and the reversing door. Realigning them takes minutes once you know what the indicator lights are telling you.
Programming remotes and wireless keypads is part of the same job. I replace dead remote batteries, reset the travel limits so the door seats fully without straining, and set the force so the door reverses on an obstruction the way it should. Testing that reversal with a piece of timber laid flat under the door is the last thing I do before packing up. Sensor and opener faults are the most common garage door repair calls I take, and most are sorted in a single visit.
Seals, draughts and winter
The rubber astragal along the bottom of the door hardens and splits after a handful of Ontario winters, and once it does the door stops sealing against an uneven floor. Cold air, meltwater, road salt and mice all follow. Replacing it means sliding a new profile into the retainer, and where the concrete is out of level a taller seal closes the gap without forcing the door.
Side and top weatherstripping matters just as much, especially on an attached garage under a bedroom. I fit fresh vinyl stop moulding so it just kisses the door face, tight enough to seal and loose enough that the door is not dragging along it every cycle.
