Garage door won't close all the way? Common causes

That's the short answer. The right fix depends on how the door behaves when it tries to close, so start there.

Why a garage door won't close all the way

Watch what the door does, because the behavior tells you the cause:

• It starts down, then reverses back up. That is the photo-eye safety sensors. Two small sensors sit a few inches off the floor on each side of the door. If they are dirty, knocked out of alignment, or blocked, the opener thinks something is in the way and sends the door back up.
• It stops a few inches short and sits there. That is usually the close-limit setting. The opener is told to stop too early. This is common after a power outage or a new opener install.
• It binds, jerks, or stops at the same spot every time. That points to a physical obstruction: a roller off the track, a bent track section, or a buildup of debris where the door meets the floor.

Quick checks before you call

Run through these in order:

1. Look at the sensor lights. Most openers have a steady light on each sensor. If one is off or blinking, wipe both lenses with a soft cloth and gently aim them at each other until both glow steady.
2. Clear the door's path. Check the floor where the door lands and the tracks on both sides for anything jammed in the way.
3. Test the close limit. If the door reverses with nothing in the sensors' path, the limit may need adjusting. The screws are usually on the back of the opener motor, so turn them in small amounts.
4. Watch the rollers and track. Run the door down by eye and look for a roller riding out of the track or a track that has been bumped out of square.

Our team handles garage door repair across Lakewood and the metro, and a door that will not close is one of the most common calls we get.

When it is the opener, not the door

Sometimes the door is fine and the opener is the problem. If the sensors are clean and aligned, the path is clear, and the limit looks right but the door still will not close or stay closed, the opener's logic board or travel module may be failing. A worn opener throws inconsistent behavior: closing fine one day, reversing the next.

If the opener motor hums but the door does not move, or the opener forgets its settings after every outage, that is a sign the unit is near the end of its life. You can see what garage door opener repair in Lakewood covers, since a board swap is often cheaper than a full opener.

When to stop and call a tech

Some causes are not do-it-yourself:

• The door binds because a cable has slipped off the drum or frayed. Cables are under spring tension and are not safe to handle.
• The track is bent or pulled loose from the framing.
• The door is out of balance, so the opener cannot set a clean close point. Balance is a spring job.

Forcing a door that will not close, by holding the wall button down, can strip the opener gears or pull a cable loose. If the simple checks do not solve it, that is the point to have it looked at. A door that will not seal at the floor also lets in Colorado weather and pests, so it is better to fix it promptly than to prop it shut.

What to expect from a service call

When a tech comes out for a door that will not close, the first step is to watch the door run, the same way you did, and read the behavior. From there the visit usually covers a quick set of checks: sensor alignment and wiring, the opener's open and close limits, the condition of the rollers and track, and a balance test to confirm the springs are carrying the door. A balance test is simple. With the opener disconnected, the door is lifted halfway by hand. A balanced door stays put. A door that drops or flies up is out of balance, and that throws off the opener's close point.

Most no-close calls are solved the same day, since the common causes are sensor and limit adjustments plus a roller or cable. If the fix is a worn opener or a spring, the tech can quote that on the spot. The point of the visit is to find the one real cause instead of guessing, because a door that reverses can have two issues stacked, like a dirty sensor and a slightly low limit, that look like one problem.

A few habits keep the door closing cleanly between visits: wipe the sensor lenses when you clean the garage, keep the track clear of stored items that can lean into the door's path, and have the door lubricated and balanced once a year. A door that closes the first time, every time, is usually a door that has been kept in balance.