In short:
- A multipoint lock engages in stages: door closed, handle lifted to throw the hooks, rollers or bolts, then key turned to lock them. Which stage fails tells you where the problem is.
- The open-door test is the most useful check you can do: if everything moves smoothly with the door open but binds with it shut, the lock is probably fine and the door or keeps are out of line.
- If the handle won't lift or the key won't turn even with the door open, the gearbox, cylinder or linking rods are the likely cause.
- Stop if it needs force. HOPPE's guidance on multipoint locks is to stop and recheck rather than push harder, because forcing a binding lock breaks gearboxes.
- A multipoint door that only latches isn't locked. Plan how to keep the house secure until it's fixed.
How a multipoint door locks, stage by stage
A multipoint lock has a central gearbox behind the handle and cylinder, and a long faceplate running up and down the door edge. Inside the faceplate, rods connect the gearbox to extra locking points near the top and bottom of the door: hooks, rollers, mushroom cams or shootbolts, depending on the make. Each locking point engages its own keep on the frame.
On most residential multipoint doors, locking happens like this:
- Close the door. The latch holds it shut.
- Lift the handle. The rods move and the hooks, rollers or bolts throw into their keeps, pulling the door tight against its seals.
- Turn the key or thumbturn. This locks everything in place, often throwing a central deadbolt too.
Which stage is failing?
| Where it stops | Likely area |
|---|---|
| Door won't close far enough to latch | Door has dropped or swollen, seals too thick, keep in the way |
| Handle won't lift, or only with a lot of force, door closed | Hooks or bolts not lining up with their keeps |
| Handle won't lift even with the door open | Gearbox or rod fault inside the lock |
| Handle lifts, but the key won't turn | Locking points not quite fully thrown, or a cylinder fault |
| Handle is floppy or doesn't spring back | Broken spring in the gearbox or handle |
| Everything works, but the door rattles or lets in light | Keeps set too far back, or worn locking points |
| Key turns round and round without locking | Cylinder cam broken or slipped, or gearbox failure |
The open-door test
This one check separates a lock fault from a door fault, and it needs nothing but a few seconds of care.
- Open the door fully and wedge it gently so it can't swing.
- Lift the handle slowly. Watch the hooks, rollers or bolts come out along the edge. They should all move together, smoothly, to their full travel.
- Turn the key or thumbturn to lock. It should turn without effort.
- Unlock, and push the handle back down. Everything should retract.
If it all works smoothly with the door open, the lock mechanism is probably fine and the problem is how the door meets the frame. HOPPE's troubleshooting advice for its multipoint locks says the issue is usually alignment rather than a defective lock, and that if the lock works with the door open but binds when closed, door-to-frame alignment or keep position is the place to look.
If it binds or stops with the door open, the fault is inside the lock: the gearbox, the rods or the cylinder. That needs a locksmith.
Never lock the door from the outside, or close it behind you, while you're testing a lock you're not sure about. If it fails locked, you've turned a repair into a lockout.
Why the door and the keeps fall out of line
Multipoint locks are precise. Several locking points have to meet several keeps at once, while the door presses evenly against its seals. Small movements that a single latch would shrug off can stop a multipoint lock from engaging.
- The door drops on its hinges, so the top hook sits lower than its keep. Heavy timber and steel doors are especially prone to this.
- Timber swells in a wet summer, tightening the door against the frame so the hooks can't pull it closed.
- Seals compress or get replaced. A new, thicker seal can stop the door closing far enough for the hooks to reach.
- Keeps work loose after years of a door being forced shut.
- A rod connection slips. Lathams, a UK door maker, advises checking that the hooks sit through the eyes in the connecting rods and that the bottom hook is parallel with the top one. That's an inside-the-lock check best left to a technician, but it explains why one locking point can fail while others work.
ASSA ABLOY's product care guidance makes the wider point that faulty hinges and warped doors or frames put extra load on lock components and shorten their life. A multipoint gearbox that's been fighting a misaligned door for months often fails sooner than it should.
What not to do
- Don't force the handle up. HOPPE's advice is that if the handle won't lift fully or the door must be forced to lock, you should stop and recheck instead of pushing harder. Force on a binding handle goes straight into the gearbox, and a broken gearbox costs far more to put right than an adjustment.
- Don't lean on the key. If the key won't turn, the locking points probably aren't fully thrown. Forcing the key breaks cylinder cams and keys.
- Don't adjust keeps or hinges at random. Moving one keep to fix the top hook can stop the middle one working. If you're not sure what each adjustment does, leave it.
- Don't spray anything into the cylinder or gearbox. ASSA ABLOY recommends graphite powder for cylinders, a small amount of a Teflon-based lubricant or light oil for exposed moving parts, and warns against silicone-based lubricants and against over-oiling. Check what your lock's maker says.
Keeping the house secure until it's fixed
A multipoint door that closes on its latch but won't lock is held by a sprung latch alone. That's not secure for a front or patio door overnight. Until it's repaired:
- Lock any security gate or burglar door in front of it.
- If the door is still openable, avoid closing it hard and testing it repeatedly; each attempt risks it jamming locked.
- Arm your alarm and let your armed-response company know if a door can't be locked.
- If the door is stuck locked instead, use another exit and don't force it; that's a call-out job.
Our 24/7 emergency service covers doors that won't lock as well as doors that won't open.
Repair, adjust or replace
Most multipoint problems fall into three groups:
- Adjustment only: the lock is fine, but the door or keeps need resetting. This is often the quickest and least costly outcome.
- Part replacement: a failed gearbox or cylinder can often be replaced on its own, provided an exact match for the make and size is available.
- Full replacement: if the lock is obsolete, badly worn or no matching gearbox exists, the whole strip may need replacing.
Our lock repair service handles adjustment and part replacement, and we quote for lock replacement when that's the better option. If your door won't latch at all, our guide to doors that won't latch covers that earlier stage.
Photos help us bring the right parts. Send a picture of the whole door, the faceplate on the door edge (brand names are often stamped near the gearbox), the keeps on the frame, and the handle and cylinder from both sides. Then you'll get a quote on site before any work starts, plus the R250 call-out, with payment by EFT, cash or card.
Questions
My handle lifts easily when the door is open but not when it's shut. Is the lock broken?
Probably not. That pattern usually means the hooks or bolts aren't lining up with their keeps, so the door or keeps need adjusting. The lock mechanism itself is working.
Can you replace just the gearbox?
Often, yes, if an exact match for your lock's make and size is available. The technician will check what's fitted and quote before ordering or fitting anything.
Is a multipoint lock worth keeping if it keeps giving trouble?
Usually the lock is fine and the door is the problem. Once the door hangs properly and the keeps are set right, a multipoint lock should work smoothly. If it's worn out or obsolete, replacement may make more sense.
Need a locksmith to look at it?
If this hasn't solved the problem, our lock repairs service covers it. We're a mobile locksmith in Johannesburg, so we come to your door.
Sources and further reading
- MP Locks: HOPPE multipoint lock final assembly troubleshooting — Problems are usually alignment rather than a defective lock; works open but binds closed points to door-to-frame alignment or strike position; stop and recheck instead of forcing.
- Lathams Steel Doors: Multi-point troubleshooting — Hooks must sit through the eyes in the rods; bottom hook parallel with top hook; check shootbolts extend freely.
- ASSA ABLOY South Africa: Product Care and Maintenance (PDF) — Faulty hinges and warped doors or frames overload components; graphite for cylinders; Teflon-based lubricant or light oil for exposed parts; avoid silicone and excess lubricant.