The first hard freeze arrives a few hours before dawn. By seven the calls start, and most describe the same morning: the button got pressed, the opener groaned, and the door did not move an inch.

Rain is coming in sideways across the field, and you are standing at the end of a long gravel drive in a rubber boot, both hands on a fourteen-foot iron gate that has swollen tight in its hinges.

You called about one problem. Maybe the door groaned every time it opened, or the opener started running longer than it used to before the door actually moved.

A garage door rarely fails as one clean event. It wears down as a string of small compromises: a track that's drifted a little out of true, a seam where the coating has broken and rust has begun to form, and a spring nearing the end of its rated cycles.

A garage door can weigh well over a hundred pounds, and it's supposed to stop or reverse before that weight reaches something soft, a foot, a hand, a pet crossing at the wrong moment.

A door that used to glide now grinds. A few silvery specks show up on the floor near the track, and you assume it's dirt until you look closer and realize it's metal.

You press the remote, or reach over and hit the wall button, and the ceiling unit answers right away with a low, steady hum, sometimes with a light flicker.

Three boxes sit on a shelf: one printed with LiftMaster's mark, one in Chamberlain's blue, one carrying Genie's own logo.

You pull into the driveway, hit the button, and the whole thing announces itself to the neighborhood.

Monday morning the door goes up for the first car and comes back down. Twenty minutes later, it runs again for the second time.

You are at the kitchen table, or half asleep in bed, when you hear it: the low grind of the opener rail engaging, then the door itself climbing its track.

Most guides to a garage door that won't seat start and end with the photo-eye sensors, and for good reason: dirty or misaligned eyes cause the majority of these calls.

Open the panel, and the tripped breaker is easy to spot. Its handle sits off center, out of line with the row, neither on nor off.

Some garages were never built with a motor in mind. You lift the door by hand, it holds wherever the springs decide to hold it, and the ceiling above it is open joists, a bulb on a pull chain, and a sheet of plywood somebody laid across the rafters for storage.

Few garage-door quirks are as maddening as one that closes almost all the way, pauses, then rolls back up on its own like it changed its mind.

You press the button, the door does nothing, and you sit in the driveway wondering what just broke.

It is a bad morning. You need to leave; the car is sitting in the garage, and the door will not move.

Look up at the torsion spring above a garage door and the rust is usually the first thing that catches the eye: a dusting of orange along coils that used to be a uniform gray. It's tempting to file that color next to the rust on a porch railing, annoying but not urgent.

A garage door spring looks like something you could pick up at a hardware store: a coil of steel, the same basic shape as the spring in a screen door or a pen. That resemblance is exactly what gets people hurt. A garage door spring isn't a bigger version of a hardware-store part.

If you have ever looked up at your garage door and wondered what exactly is holding all that weight, the answer comes down to one of two spring designs. Both do the same basic job: they counterbalance the door so the opener (or you, by hand) does not have to lift its full weight every time it opens.