UPVC Door Locking Mechanism Problems and How to Fix Them

If you’re a homeowner or landlord, recognising the signs of a failing uPVC door locking mechanism can save you both time and money. Unfortunately, it is not uncommon for dishonest locksmiths to misdiagnose uPVC lock problems as a mechanism problem. Falling victim to this common rogue locksmith uPVC mechanism scam can have multiple negative repercussions, including unnecessary financial outlay, inconvenience, and worst of all, intimidation.

So even though uPVC mechanism problems need to be dealt with by a qualified specialist, some understanding of what you are getting for your money is an advantage to the property owner. As MLA approved security specialists providing locksmith services in Barnet and the surrounding areas, here we will provide some insight into what to expect when you experience uPVC locking problems.


Why uPVC Door Locking Mechanisms Fail

A uPVC door lock mechanism not working can often be traced back to one of the following causes:

  1. Misuse or Neglect – Excessive force when opening or closing the door, lack of care, and infrequent maintenance all accelerate wear.
  2. Weather Extremes – Heat expansion in summer and contraction in winter can affect alignment, causing locking issues.
  3. Age and Wear – The average lifespan of a uPVC door lock mechanism is around 7–8 years with good care. After this, parts can fail and require repair or replacement.

Tip: We a noticeable increase in uPVC locking mechanism problems during seasonal changes due to fluctuations in temperatures.

upvc door lock


Common uPVC Door Lock Mechanism Problems and Symptoms

Here we explain how to trouble shoot 5 common uPVC door issues to establish if the problem is;

  • A mechanism issue
  • A more straightforward lock problem
  • Something that requires an adjustment or maintenance

1) Handle Feels Loose or Stiff = IT COULD BE a mechanism problem or several other issues

This could mean a variety of things:

  • The spring cartridge in the handle could be broken
  • The handle could be on its “last legs”
  • If it is very stiff, it could be an alignment issue.
  • There is also a chance that the mechanism is on its way out


2) Key won’t turn or gets stuck = IT COULD BE a mechanism problem or a a cylinder issue issue

More often than not, this would mean the mechanism is either broken or needs realigned. It could also be an issue with the cylinder.


3) Door Won’t Lock or Unlock Properly = IT COULD BE a faulty mechanism problem or an alignment issue

A uPVC door that won’t lock properly could be a problem with alignment due to movement in the door resulting from wear and tear or extreme weather. Checking alignment should be the 1st port of call. If alignment isn’t the issue, them there would be a fault with the mechanism.

4) Misaligned door due to dropping = an alignment problem and NOT a faulty mechanism problem

As mentioned above a misaligned uPVC door can cause locking problems.

5) Multi-point Lock Doesn’t Engage Fully = IT COULD BE a faulty mechanism problem or an alignment issue

As above a uPVC lock which doesn’t engage properly the 1st port of call is to check if there is an alignment issue and if it’s not then it could potentially be a faulty mechanism.

Some awareness of these issues can help prevent a dishonest locksmith from replacing your mechanism when it is not needed.

How to Adjust a uPVC Door Locking Mechanism

If you find that your door is not aligned with the uPVC door locking mechanism, then realignment is necessary to realign the door strike plate with the mechanism. It could be the strike plate that needs to be adjusted. This can be done without a professional if you know what you’re doing; however, it is advisable to call an experienced locksmith to prevent damage to the lock or mechanism.

DIY caution: Incorrect adjustments can cause more damage. Always consult a professional locksmith if in doubt.


Fixing a uPVC Door Lock Mechanism That is Not Working

To fix a uPVC mechanism, various tests need to be carried out to assess where the problem lies. It could be a loose part or parts that have seized up and need to be lubricated. This type of assessment is not something that an amateur should do. Always contact a specialist in uPVC door lock repairs for advice to prevent further problems or damage and to ensure that you find the most economical solution.


When to Replace the uPVC Locking Mechanism

A professional locksmith will know if the mechanism can be repaired or needs to be replaced. Replacing a uPVC mechanism is a last resort and only needs to be done if it has reached the end of its lifespan and is faulty. You should expect a new uPVC mechanism to last 7-8 years, but it can last much longer when cared for and regularly serviced. It is not as common for uPVC mechanism replacement to be required as lock repairs, realignment or mechanism repairs.

In some cases, replacing the mechanism is the most economical option. However, this should not be done lightly. The mechanism will need to be replaced with a like for like part. A locksmith will need to;

  1. Measure up the mechanism
  2. Take pictures
  3. Source a replacement to match the original (if they don’t already have one in stock)

Should a Locksmith Take a uPVC Mechanism Away?

Never allow a locksmith to remove your uPVC mechanism and take it away to source a new one. If a locksmith wants to do this, you have called a dishonest locksmith. The scam is that without the original mechanism, you cannot have your door fixed by another locksmith. They are essentially holding your mechanism to ransom. Sadly, they use intimidation to get money from customers on the basis that their door will be left unsecured.

locksmith scams


Preventing Future Locking Mechanism Problems

There are ways to avoid a uPVC door lock mechanism not working​. Giving your uPVC door care and attention as soon as you notice any issues is the main way to prolong the longevity of your uPVC door locks and mechanism. If you notice any issues with the door locking, call a professional to service the door without delay. Keeping on top of issues can prevent an accumulation of problems and the likelihood that you need to replace the mechanism or the lock.

Read more about how to prevent UPVC door lock problems here.


When You Need a Locksmith to Fix Your UPVC Door Lock Mechanism

If you have problems with a upvc door lock mechanism sticking, calling an approved locksmith and not just the cheapest locksmith you find on Google is extremely important to avoid being taken advantage of.

MLA logo

If the door won’t lock, then you will need to call an emergency locksmith experienced in uPVC repairs and maintenance.

How to Replace a uPVC Mechanism

Trying to replace a mechanism DIY style without experience could cost you dearly. Although you can find some websites with instructions on uPVC mechanism replacement online, we would not advise doing this without experience. You are likely to regret it.

How Much Does it Cost to Replace a UPVC Door Mechanism

uPVC locking mechanisms cost from £90 to £200+, plus labour from £80 to £180. Don’t expect to pay less than £80 or more than £200 in parts for a new mechanism / uPVC gearbox replacement.


How IKS Locksmiths Can Help with uPVC Door Lock Mechanism Problems

IKS locksmiths are approved by the Master Locksmiths Association and are experienced in dealing with all uPVC door lock problems. We will find the most economical solution and ensure that your door is in good working order. We deal with upvc window lock mechanism problems as well as doors.

uPVC door mechanism problems
IKS uPVC Window and Door Repair

We hold stock of the most common uPVC mechanisms and can get your door back in working order quickly and efficiently with an on the spot repair in most cases. Even if you have a less common mechanism and need to wait for a replacement, we will provide a temporary repair to ensure your door is always secure and source the new part quickly.

Contact IKS Locksmiths for expert advice on door and window locks.

How can we help you?

For professional security advice and information call to speak directly to Martin, our Master Locksmith and security specialist.

Master Locksmiths Association

Master Locksmiths Association

BOOK A FREE SECURITY SURVEY

BOOK A FREE SECURITY SURVEY EMERGENCY CALL OUT
OPEN 24 HOURS, 7 DAYS A WEEK
NO CALL OUT CHARGE

Contact Us

CONTACT INFO

  • IKS Locksmiths Ltd
    Unit E2,
    Queens Rd,
    Barnet EN5 4DJ