A garage door is the largest moving object in most houses, and it moves under stored energy, near cars, kids, and pets. It also gets used more than almost anything else in the home. Every open and close puts wear into springs, rollers, hinges, and cables, and that wear stays quiet for a long time before it finally announces itself, usually at the least convenient possible moment.
Twice a year is a rhythm you can actually keep. Pair it with the clock change, or with the start and end of winter. The checks below take about fifteen minutes, and none of them require tools or touching anything under tension. What they buy you is warning, which means catching a failing part while it is still a scheduled repair instead of a Saturday morning with a car trapped inside the garage.
Modern openers have two safety systems, and both are worth testing. Start with the contact reverse. With the door open, lay a solid object flat on the floor in the door's path, such as a length of two-by-four laid down on its side. Run the door closed. When it touches the object it should stop and reverse back up. If it stops and sits there, or keeps pushing down, it needs service.
Then the photo eyes. With the door closing, pass an object like a broom handle through the beam near the floor while keeping your hands and body clear of the opening. The door should stop and reverse immediately. If nothing happens, the sensors may be misaligned, dirty, or miswired. Never disable, bypass, or raise the sensors to stop a door from reversing, because that removes the only thing protecting whatever is standing underneath.
Close the door, pull the manual release cord to disconnect the opener, and lift the door by hand to about waist height. A balanced door stays roughly where you put it and feels manageable through the whole travel. If it drifts down, slams shut, or shoots upward, the springs are out of adjustment or wearing out, and the door is no longer carrying its own weight the way it should.
Note what you find and stop there. Balance is corrected by adjusting or replacing springs, and that is the one part of the door that is genuinely dangerous for an untrained person to touch. An unbalanced door is also quietly wearing out your opener, so it is worth reporting rather than living with. Reconnect the opener afterward by running it until the trolley clicks back onto the carriage.
Stand inside with the door closed and look at the hardware. Check the cables on both sides for fraying, kinks, or slack. Look at the hinges between sections for cracks or elongated bolt holes. Look at the rollers for chipped wheels or visible wobble. Look at the track for dents, gaps at the joints, or loose mounting brackets. Look at the bottom seal for cracks and daylight underneath.
Then run the door and listen to it. Grinding, popping, scraping, or a bang at the same point in every cycle is the door telling you where to look. Watch it move as well: it should travel evenly, without shuddering, and both sides should stay level with each other. A door that lifts even slightly crooked has a cable or roller problem that gets worse with every cycle it runs.
The manual release cord disconnects the door from the opener so the door can be moved by hand. It is what you use in a power outage, and it is what a neighbor or a firefighter might need to use in an emergency. Find yours now, and practice using it once with the door closed, so you know how it feels and how the trolley re-engages afterward. Show whoever else lives in the house.
Do not pull it while the door is open. If the springs are weak or broken, releasing an open door can let it come down hard. And if the door feels heavy the instant it is disconnected, that is not a reason to muscle through it. That is the same broken-spring symptom described everywhere else on this site, and it means calling 801-823-6018 rather than lifting.
With the door closing, pass a long object such as a broom handle through the beam near the floor while keeping yourself out of the opening. The door should reverse immediately. If it does not, check that both sensor lights are on and steady, that nothing is blocking the path, and that neither bracket has been bumped out of line.
Yes, within limits. Rollers, hinges, and bearings can be lubricated with a product made for garage doors. Keep it off the track, which only needs to be clean, and skip heavy grease that collects grit. Do not spray the springs to quiet a noise, because noise from that area is something to have looked at instead.
Do not adjust, unwind, or replace springs, and do not touch cables or the drums they wind onto. Do not operate a door that is off its track or hanging crooked. Do not disable, bypass, or move the photo-eye sensors to stop a door from reversing. Everything on that list is either under tension or a required safety feature.
A few details about the door, or call 801-823-6018 if a car is trapped inside.