The door stops partway up for no reason, or opens fine and then refuses the next time. Some days the keypad works and some days it does not.
The door opens about a third of the way and stops. Turning the limit screw on the head has made no difference, and the trolley seems to sit in the wrong place along the rail when the door is fully closed.
After the power came back you pulled the red cord to get the car out. Since reconnecting, the door stops short of the floor, and no amount of turning the limit adjustment brings it the rest of the way down.
Press the button and the motor hums, but the door stays exactly where it is. Under the housing there is a dusting of white plastic shavings, the sign of a stripped drive gear, and this is the second time it has happened.
Someone backed the car in a little too far, a bin or a bicycle brushed the track, and since then the door starts to close and comes back up. One sensor now sits at a slightly different angle from the other.
The outdoor keypad worked all summer. Now that the mornings are below freezing it lights up faintly, takes the code, and the door does nothing.
You are twenty minutes down the highway when the thought lands: did the garage door close behind you? You cannot picture it.
Your garage is detached and has no side door. The remote is dead, the keypad is dead, and the small round lock in the top panel is meant to be your way in.