If your tilt and turn window is hanging off its bottom corner with the top swung into the room, nothing is broken. The mechanism has gone into both of its modes at once, which it is not supposed to be able to do, and it can be put back. Read the section below before you touch it, because how you handle the next two minutes decides whether this stays a five minute fix.
Three handle positions, one gear track
A standard uPVC window has a handle that turns ninety degrees: locked or unlocked. A tilt and turn handle turns a hundred and eighty, and each quarter of that travel means something different.
Handle down. Locked. Every locking point around the sash is engaged into its keep and the window is shut tight against its seals.
Handle horizontal. Turn mode. The sash releases along the top and one side and swings inwards like a door, hinged on the vertical edge. This is the position for cleaning the outside of the glass from indoors, which is why these windows are so common in flats.
Handle up. Tilt mode. The top of the sash leans into the room a few inches while the bottom stays put, hinged along the bottom edge. Ventilation without a window standing wide open.
What links the three is a gear track. Running around all four edges of the sash, hidden in the groove between sash and frame, is a continuous run of steel bar with teeth, cams and corner pieces. The handle drives a gearbox in the middle of one edge, and that gearbox shifts the whole track a short distance one way or the other. Because the track goes right round the sash, moving it a couple of centimetres at the handle releases the top arm, engages the bottom pivots, or locks everything down, depending on how far you have turned.
The classic fault: hanging off one corner
Here is where it goes wrong. The gearbox has no idea whether the window is open or shut. It only knows where the handle is pointing.
So if the sash is open in turn mode, swung in like a door, and somebody takes the handle and turns it up to tilt, the track shifts. The bottom pivots engage while the sash is still hanging on its side hinge, and the top arm releases. The sash is now held at one corner only and the top swings free into the room. It looks and feels like the window has fallen off.
Nearly every tilt and turn made in the last few decades has a mis-handling device fitted to stop precisely this: a small spring-loaded block that senses the sash is off the frame and blocks the handle from turning. They work well, but they wear, they can be beaten by someone turning hard enough, and older windows may not have one at all. Children experimenting with the handle account for a fair share of the ones we go out to.
Putting it back, calmly
The sash is not damaged. It has gone into a state the mechanism has no answer for. What damages it is letting it hang and swing while you work out what to do.
- Take the weight. Two hands on the sash, held up against the frame in roughly the position it should be in. If there is someone else in the house, get them holding it.
- Push the top of the sash back towards the frame so the top arm sits alongside its channel again. The arm is the metal stay running along the top edge that has come adrift.
- Holding the sash closed, turn the handle back to the position it was in when the trouble started, usually horizontal for turn.
- You should feel the top arm click back into engagement. Some makes have a small lever on the arm or on the mis-handling block that has to be held over while you do this.
- Close the sash properly and turn the handle fully down to locked, then work it slowly through all three positions with the window shut to check it is behaving.
Now the honest part. If the sash is heavy, or it is upstairs in a flat, do not attempt this on your own. A tilt and turn sash with a big sealed unit in it is a serious weight, and the failure mode is the whole thing coming loose over an open drop. Hold it, get someone to help you hold it, and ring somebody. Do not let it swing while you fiddle with the handle and do not let go to try something. A held sash is a safe sash and there is no rush.
If it has already come off its bottom pivot, that is a two person lift and a refit, not a nudge.
The other things that fail
The tilt arm. The stay along the top edge that limits how far the window leans in. It takes the load in tilt mode and it takes the abuse when the handle gets mis-turned. Bent arms, worn end fittings and pulled fixing screws are all common, and all replaceable.
The corner drives. Where the gear track turns each corner there is a flexible or geared corner piece linking one run of track to the next. They are a wear point by design, being the part that does the bending. A cracked or slipped corner drive shows up as one edge locking and another not, or a handle that goes fully down while the sash still rattles.
Worn gearing. A handle gone stiff is usually telling you the teeth in the gearbox or on the track are worn, the track has picked up dirt and lost its lubrication, or the sash has dropped so the cams grind into the keeps rather than sliding into them. Forcing a stiff tilt and turn handle is how a gearbox strips, and a gearbox is a bigger part than a hinge.
If yours is stiff rather than broken, a clean and a proper lubricant on the track and cams, plus a check of the sash alignment, sorts a good number of them. Worth a go before ringing anyone.
Whole windows are rarely the answer
Tilt and turn gear is a system and the parts are available. Arms, corner drives, gearboxes, keeps, mis-handling blocks. A repair sits nowhere near the cost of replacing a window with nothing wrong with its frame or glass.
If yours is hanging, hold it, get it supported, and ring us on 01698 604 278 rather than wrestling with it. If it is stiff or locking on one side only, a photo of the handle and one of the edge of the open sash sent over on WhatsApp will usually tell us which part it is. We cover Wishaw, Motherwell and across Lanarkshire, weekdays 8 till 5, and no charge for coming to look.
Tilt and turn gear is fiddly, but it is repairable, and getting it running properly again is ordinary uPVC window repair work.
Related advice
See our window repair service page for what we do and where. If you would rather just ask, get in touch.
There are around fifty more plain English guides in our advice section.
Written by the team at Wishaw Window Repairs. Over thirty years repairing uPVC windows and doors across Lanarkshire.