GU Lock Repair Kensington
Call us to book a fast 24/7 emergency locksmith service for your GU door lock.
Are you in need of a fast solution for your GU mechanism? If the key turns halfway and jams, or the lever will not lift, the fault sits in the centre case buried in the edge of the leaf. Reach out to our locksmiths in Kensington now. Day or night, we are ready to assist you. We carry GU Ferco centre cases in stock, so most jobs finish on the first visit.
24-Hour Locksmith Service Throughout Kensington
Fast Response And Local Solutions
Reach out to our team the moment yours starts sticking. Whether the key jams mid-turn, nothing will latch, or the unit has seized completely, our locksmiths know these units in detail and carry the parts to put it right on the spot.
Call our company now, and we’ll help fast. Your local locksmith will be with you in about 30 minutes, no matter your location in Kensington.
How A GU Ferco Multipoint Lock Works
A GU Ferco multipoint door lock is one long assembly buried in the edge of the leaf. Lifting the lever drives a steel rail upward, and that rail throws the locking points out into the frame together. Turning the key holds them there.
Depending on age and style, you will find some mix of these locking points:
- Hooks that swing out and pull everything tight
- Deadbolts that throw straight out from the centre case
- Rollers or cams that compress against the seal and can be adjusted
- Shootbolts on Cremona and double units
- A latch that holds things shut before the lever is touched
The visible strip is the faceplate the multipoint door lock sits behind.
The centre case, or gearbox, sits behind it, and on GU Ferco units that is nearly always the part that wears out.
Latch Deadbolt Cases And Roller Variations
This is where GU Ferco differs from every other brand we handle, and it matters before anything is ordered. A standard latch deadbolt centre case has both a sprung latch and a solid bolt, driven by the lever and key together. Most modern units are built this way, and a latch deadbolt case is what we fit in the majority of jobs.
Older Ferco locks are not. Many use a latch-only case with two or four rollers and no deadbolt at all, which is unusual in the market and a useful identifying feature in itself. They were fitted in quantity across Kensington through the nineties, and the quantity still in service is considerable; they are reliable enough mechanically, but by modern standards the security is poor. A failure is a good moment to upgrade to a latch deadbolt version rather than match what was there.
Identifying GU Ferco Locks
Open up and read the strip along the edge of the leaf. You may see either or both names, since GU and Ferco are the same group, and BKS units belong to it too:
- The maker’s mark – GU, Gretsch-Unitas or Ferco, usually near the middle
- Numbers stamped on the faceplate – older Ferco locks are stamped 5.28 or 5.35, and those digits give the backset directly, 28mm and 35mm
- Later markings – GU locks are often stamped 35/92, 45/92 or 55/92, which give backset and centres together
- The keeps in the frame, which frequently carry a mark of their own
If nothing is legible, send a photo. One of our trained professionals will note the style and backset before we set off, so the right parts travel with us.
Lock Repair, Lock Change Or Lock Opening
Common Door Lock Faults
The key turns halfway and stops – the classic seized centre case, and the single most common call-out of this type we attend
It grinds or feels gritty – corrosion inside, worth acting on before it seizes for good
The lever will not lift – either the case has stiffened, or the leaf has dropped, and the hooks strike the keeps
The key will not turn at all – usually the cylinder rather than the gearbox
It locks from inside but not outside – almost always the barrel or its cam
Nothing latches – the latch on the lock is not meeting the keep, normally alignment rather than a part you need
Rollers spin, but it stays loose – compression has drifted out of position, and often no parts are needed
New Centre Case Or A Full Mechanism Replacement?
Three outcomes cover nearly every job:
The complete unit. The whole assembly has corroded through, or the style is obsolete and worth upgrading. A modern replacement goes in, and we test it before leaving.
Adjustment. The gearbox is sound, and the leaf has simply dropped. We reset the hinges and keeps until the points locate cleanly, and clear the drainage slots while we are there. No parts.
A replacement case. The gearbox has failed, but the rail and locking points are fine, so a replacement case re-attaches to what is already in the door.
Cost-Effective Repairs Rather Than Wholesale Replacement
Replacing the case alone is far more cost-effective than a complete unit, and on GU Ferco it is possible more often than most people expect. The rail, the hooks and the keeps rarely fail. It is the gearbox that gives out, and it is the gearbox we can change.
Water is what kills them. Rain works into the bottom of the leaf, corrodes the case from inside, and the key binds long before it stops turning altogether. Blocked drainage slots are the usual culprit, and clearing them takes minutes. Our full guide to alignment and care covers what we adjust on site and what you can do between visits.
Measurements That Decide What Fits
GU has produced more variants than any brand we handle, and older Ferco locks do not follow the standards everything else uses. These features decide the replacement:
- Backset – from the edge to the centre of the keyhole. A 28, 35, 40, 45, 50 or 55mm backset all appear here, and the backset is the figure people get wrong most often. Please note that a 28mm backset is almost unique to old GU stock
- Centres – 92mm on later GU stock, but 70mm on many older Ferco cases, so the backset alone is not enough
- Spindle – 8mm as standard. A single spindle of 7mm features on those same older cases, and a single spindle set bought to the usual size will not go in. Single spindle and split spindle versions are not interchangeable
- Faceplate – 16mm and 20mm widths, square or radius ends
- Locking points – how many hooks, bolts or rollers sit along the rail, and where. Doubles and French sets require a matched pair
Get one wrong and it will not fit. That is why we measure on site before we quote, rather than after.
Where These Units Turn Up
- Secury and Secury Automatic – the current mainstream style, including versions that throw the bolts as the leaf closes
- Europa and Monolock – very widely fitted on uPVC
- Cremona – shootbolt units, common on double and French sets
- Eagle, Rhino and Tripact – older ranges still in service
- Ferco latch and roller cases – the low-security units described above
- Commercial aluminium – narrow-style versions are common on shopfronts, and these take far more use than any home entrance
Composite and uPVC account for most of what we see, though the same group supplies hardware for timber and aluminium doors too. An obsolete range does not mean buying new: in nearly every case a modern case can be fitted to what you already have.
About The Brand
GU is short for Gretsch-Unitas, a German group that also owns Ferco and BKS. Between them, they supply a large share of the multipoint door hardware fitted across London, which is why we are called to these more than almost anything else.
The product is well engineered, and the tolerances are tight. That precision is also why alignment matters: a door lock built to fine limits will wear faster on a leaf that has dropped than a cheaper one would. Most locksmiths would agree that alignment, not the hardware, is what shortens their life.
About Our GU Door Lock Repair Process
We aim to reach your Kensington property in about 30 minutes. Our process is pretty straightforward:
- Diagnosis – we establish whether it is the cylinder, the gearbox, corrosion or alignment
- Adjustment first – if hinges or keeps have moved, we adjust before recommending parts
- Repair or replace – a matching case goes in from van stock, or an upgrade if yours is obsolete
- Test and guarantee – we run it through a full cycle before leaving, and our work is guaranteed
What Affects The Price
- Adjustment, a replacement case, or the complete unit
- The backset, centres and spindle your door requires
- Whether the cylinder is being replaced as well
- Whether an obsolete style needs upgrading rather than matching
- Call-out time – standard hours or emergency
Customer Feedback
You can read feedback on our work on our customer reviews page. If we have attended your property, a few words about how the job went will assist other people in Kensington deciding who to call, and it helps us ensure standards stay where they should be. Honest feedback is essential to us.
Frequently Asked Questions
It is stuck and the key will not turn. Can you get in?
Yes. A seized centre case is one of the most common emergencies we attend, and we open up and repair on the same visit wherever possible.
Is a seized gearbox repairable?
If it is only stiff, lubrication and adjustment often restore it. Once it has seized fully or the internals have sheared, a replacement is the reliable answer.
What is the difference between GU and Ferco?
They are the same group, so you may see either or both names on the same product. Some older Ferco cases use different dimensions, which is why we check before we purchase anything.
Mine is stamped 5.35?
An older Ferco unit with a 35mm backset. Those can still be upgraded to a modern equivalent.
Do you cover emergencies?
Yes. If you are locked out or nothing will secure, we treat it as an emergency call-out with a 30-minute response target, 24/7.
Related Pages
- Winkhaus Lock Repair – our page on Winkhaus units
- Fullex Lock Repair – our page on Fullex and the XL range
- Composite Door Locking Mechanism Problems – fault finder
- Changing Lock On uPVC Door – our uPVC page
- Door Lock Repair Kensington – our main repair page
- Insurance Approved Locks – security standards
Book Kensington Locksmith
Day and night, our locksmith in Kensington offers a 24-hour service. Get a fast service at your doorstep. We are prepared to offer fast solutions with our fully equipped emergency locksmith anytime. Book us now and secure your property properly.
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