Problem & safety
Overhead Door Won't Close: Securing Your Building After Hours
A door that won't close is a different kind of emergency than a door that won't open — the building is exposed to weather, theft, and after-hours entry. The good news: some causes have a safe check you can do yourself, and the rest come down to securing the opening until a contractor arrives.
What's happening
"Won't close" covers a few very different situations, and telling them apart decides what you can safely do. The door may run down and then reverse before it seats; it may not respond to the control at all; it may be stuck partway; or it may be physically unable to close because something is broken. The first two often have safe, obvious causes. The last two do not.
Causes worth a safe look
On a powered door that reverses or won't start its downward travel, these are safe to check without touching the spring or cables:
- The photo-eyes. Most commercial openers have a safety photo-eye near the floor on each side. If it's blocked by a pallet, bumped out of alignment, dirty, or its lens is fogged, the door will refuse to close. Clear the path and gently confirm the two eyes face each other.
- An obstruction in the opening or track — a pallet, a chock, ice, or debris in the door's path.
- The control mode. Some doors have been left in a hold-open or lock-out mode, or on a timer that isn't engaging.
- Power. A tripped breaker or a disconnected operator after a storm can leave the door dead.
Stop and don't force it if…
- A spring is broken or a cable is hanging — the door can't be safely lowered by hand.
- The door is off track, racked, or a panel is buckled.
- The door is stuck partway and won't hold position.
- You'd have to stand under the door to "help" it down.
In these cases the door is a falling hazard. Don't pull it down, and don't run the opener against it. Secure the opening a different way.
Securing the opening safely
If the door genuinely can't be closed, the goal is to protect the building without putting anyone under the door:
- Post someone or reposition to keep the opening in view if it's a theft risk, and notify whoever handles security for the site.
- Block the opening at floor level with what you have that's safe — parked vehicles, loaded pallets, or barricades — without wedging the door itself.
- If a trailer is at the dock, keeping it in place can secure that opening until morning.
- Red-tag the door control so no one tries to cycle it, and note the time and condition for your records.
What not to do
Don't disable or tape over the photo-eyes to force the door down — that removes the safety that stops the door on a person or a forklift. Don't manually lower a door that has a broken spring or cable. Don't leave the opener powered and repeatedly hitting the down button against an obstruction.
What speeds up the repair
- Whether the door is fully open, partway, or just won't seat.
- What it does on the down command — reverses, nothing, or grinds.
- Photos of the opener, the photo-eyes, and the springs and cables above the door.
- Whether you've been able to secure the opening in the meantime.
References
- DASMA — garage door safety guidance — www.dasma.com/safety-tips/garage-doors