Why will the second French door not open?
The order of operations everyone gets wrong, the seized shootbolt lever, and the seasonal case where the leaf is simply pinched by a bowed master.
- Difficulty
- beginner
- Time
- 25 min
- Read
- 4 min
- Safety
- caution
Short answer
The slave leaf cannot open until the master is fully unlocked and swung clear — that is by design. If the master is out of the way and the leaf still will not move, the shootbolt lever on its inside edge has not released, or a rod is jammed in a socket full of grit.
Most reports of a stuck French door are not a fault at all. The slave leaf is held by bolts into the frame and it is locked over by the master leaf, so it has to be released in a strict order. When there is a genuine fault, it is nearly always a lever that has never been used or a socket that has never been cleaned.
Safety
Step by step
- Open the master leaf fully first.The one with the handle and the keyhole. Unlock it with the key, drop the handle, open it and swing it right back out of the way. On many designs the master physically overlaps the slave and the slave cannot move at all until it has gone.
- Find the shootbolt lever on the slave leaf.Look at the inside edge of the slave leaf — the edge that was hidden behind the master. There will be a small lever, a cranked handle, or two flush levers at the top and bottom. That is the release. A great many households have never found it.
- Work the lever fully.It usually needs a decisive movement through its whole travel. Half-releasing it leaves a rod partly in its socket, and the leaf will move a few millimetres and then stop, which feels like a jam.
- Check for a lever that has seized.A slave leaf that is rarely opened has bolts that have sat in one position for years. Work a little light machine oil into the lever mechanism and the rod guides and try again with steady pressure, not force.
- Check the bottom socket.If the bolt released at the top but the leaf still will not move, the bottom rod is stuck in a socket full of grit, sand or leaves. Clear it as best you can from above and lubricate the rod.
- Take the load off the leaf.Push the leaf firmly towards the frame while working the lever. A rod bearing on the side of its socket, because the leaf has settled, will free the moment the pressure comes off.
- Consider heat if it is a hot day.A dark master leaf bowing in sun presses against the slave. In that state the slave can genuinely be pinched. Try again in the evening before concluding anything is broken.
- Check whether the leaf is fixed rather than opening.Some French door pairs are supplied with one leaf permanently fixed, particularly where a very wide opening has been filled. If there is no shootbolt lever anywhere on the leaf edge, this may simply be a fixed light.
- Sort the underlying cause once it opens.A slave leaf that fights every time needs its bolts and sockets cleaned and lubricated and its geometry checked. Doing that once a year keeps it usable, which matters because it is frequently part of an escape route.
If it doesn't work
Leaf moves a few millimetres and stops
Cause: One shootbolt is still partly engaged — Fix: Work the lever fully through its travel. If it will not go, the rod is fouling in a socket or a guide and needs lubricating and unloading.
No lever anywhere on the leaf edge
Cause: It may be a fixed leaf, or the lever may be concealed behind a trim — Fix: Check the original paperwork or ask the installer. Look also for two separate flush lever bolts recessed into the leaf edge at top and bottom rather than one central lever.
Lever moves but nothing happens
Cause: The drive to the rods has failed inside the leaf — Fix: This needs the leaf's hardware inspecting, which usually means removing an internal trim or the hardware itself. It is a repairable part but not an obvious one.
Stuck only after a long spell of not being used
Cause: Seized rods and dry guides — Fix: Oil and patience. Then use the leaf every few months, and add it to the annual door service.
Questions people ask
Should I be able to open the slave leaf from outside?
No. It has no external handle and no external keyhole by design, which is part of what makes a pair of French doors secure. Access is always through the master leaf.
Can I fit a handle to the slave leaf?
It would compromise the security of the pair and there is nowhere for it to drive. If the slave is needed regularly, the answer is to keep its bolts working properly rather than to add hardware.
Does the slave leaf count as an escape route?
The pair together is the opening. If the slave is seized and the master alone is too narrow for the opening's purpose, that is worth fixing on safety grounds, not just convenience.