Introduction
Every entrance door develops wear over time. Some problems appear gradually, while others seem to happen overnight. A stiff key, a handle that won't lift or a door that suddenly becomes difficult to close are often symptoms of an underlying issue rather than the actual fault.
This A–Z guide explains the most common door problems found on uPVC, composite and timber doors, helping homeowners understand what may be happening before deciding whether a repair is needed.
Common Symptoms
- Door won't lock
- Door won't open
- Door won't unlock
- Door works open but not closed
- Key won't turn or turns partially
- Key difficult to remove
- Handle won't lift
- Handle floppy
- Door dropped
- Door catching frame
- Lock works with the door open
A
Alignment Problems
Poor alignment is one of the most common causes of door faults. Even slight movement can make a door difficult to lock, place additional strain on the locking mechanism and accelerate wear.
Related Guides
• Complete Guide to Door Alignment & Lock Performance
Related Articles
• Why every door problem isn't a lock problem.
• Can a Misaligned Door Damage the Lock?
B
Broken Gearbox
The gearbox is the heart of a multipoint locking system. When it fails the handle may become stiff, the key may stop turning or the door may fail to lock completely.
Related Guide
• Complete Guide to Multipoint Locking Systems
Related Articles
• uPVC & Composite Door Gearboxes Explained
• Composite Door Gearbox Replacement
• Failed Gearbox on a French Door
C
Door Catching on the Frame
Doors that rub or catch usually indicate movement, hinge wear or alignment problems.
Related Guide
• Complete Guide to Door Alignment & Lock Performance
Related Articles
• Door Dropped? Signs Your Hinges Need Adjustment
• Why Doors Move
D
Door Dropped
A dropped door places additional strain on every moving component and should be corrected before further damage occurs.
Related Guide
• Complete Guide to Door Alignment & Lock Performance
Related Articles
• Can a Dropped Door Damage the Lock Mechanism?
• Door Won't Lock Unless Lifted
E
Easier to Lock With the Door Open
If the lock operates normally when the door is open but becomes difficult once closed, alignment is usually the underlying cause.
Related Guide
• Complete Guide to Door Alignment & Lock Performance
Related Articles
• Why Is My Door Easier to Lock With the Door Open?
• Door Lock Works With the Door Open but Not Closed
F
Floppy Door Handle
A loose handle often indicates worn springs, damaged internal components or excessive strain caused by poor alignment.
Related Guide
• Complete Guide to uPVC & Composite Door Handles
Related Articles
• Why Your Door Handle Doesn't Spring Back
• Why Does My Composite Door Handle Keep Dropping?
G
Gearbox Failure
One of the most common causes of multipoint lock failure.
Related Guide
• Complete Guide to Multipoint Locking Systems
Related Articles
- Why New Handles Won't Fix a Failed Gearbox
- Can a Locksmith Repair a Multipoint Lock?
- Common lock faults.
H
Handle Won't Lift
Usually caused by a worn mechanism, failed gearbox or door alignment issue.
Related Guide
• Complete Guide to uPVC & Composite Door Handles
Related Articles
• Why Won't My Handle Lift Anymore?
I
Internal Mechanism Failure
Wear inside the locking mechanism may prevent the door from locking correctly.
Related Guide
• Complete Guide to Multipoint Locking Systems
Related Articles
• What Causes Multipoint Locks to Fail?
J
Jammed Door
Doors that jam shut should never be forced as this may cause further damage.
Related Guide
• Complete Homeowner's Guide to Door Problems & Repairs
Related Articles
• Door Won't Open? Common Causes and Repairs
• uPVC Jammed Door Specialist
K
Key Difficult to Remove
Often caused by wear, poor alignment or a worn cylinder.
Related Guide
• Complete Guide to Euro Cylinder Door Locks
Related Articles
• Why Is My Key Difficult to Remove?
• Why Does My Key Only Turn Halfway?
L
Lock Won't Engage
Usually caused by alignment problems or worn locking components.
Related Guide
• Complete Homeowner's Guide to Door Problems & Repairs
Related Articles
• Why Won't My uPVC Door Lock?
• Why Won't My Composite Door Lock?
M
Misaligned Door
One of the most common causes of premature lock failure.
Related Guide
• Complete Guide to Door Alignment & Lock Performance
Related Articles
• Can a Misaligned Door Damage the Lock?
N
New Door Not Required
Many faults can be repaired without replacing the entire door.
Related Guide
• Complete Guide to uPVC Doors
Related Articles
• You Don't Need a New Door
• We Fix the Problem – You Keep the Door
O
Out of Alignment
Door movement affects every part of the locking system.
Related Guide
• Complete Guide to Door Alignment & Lock Performance
P
Poor Lock Performance
Increasing resistance is often the first warning sign that repairs are required.
Related Guide
• Complete Homeowner's Guide to Door Problems & Repairs
Q
Quick Repairs
Many common faults can be repaired during a single visit with the correct replacement parts.
Related Guide
• Complete Homeowner's Guide to Door Problems & Repairs
R
Rollers Not Engaging
Usually indicates alignment or mechanism wear.
Related Guide
• Complete Guide to Multipoint Locking Systems
Related Articles
• Hooks, Rollers and Deadbolts Explained
S
Stiff Lock
One of the most common homeowner complaints.
Related Guide
• Complete Homeowner's Guide to Door Problems & Repairs
Related Articles
• Why Is My Door Lock Stiff?
• Why Locks Become Difficult to Turn?
T
Top of Door Not Locking
Often caused by door movement or worn locking components.
Related Guide
• Complete Guide to Door Alignment & Lock Performance
Related Articles
• Why Is My uPVC Door Locking at the Bottom but Not the Top?
U
Uneven Locking
The locking points should engage smoothly with little resistance.
Related Guide
• Complete Guide to Multipoint Locking Systems
V
Visible Wear
Loose handles, worn hinges and stiff locks should never be ignored.
Related Guide
• Complete Homeowner's Guide to Door Problems & Repairs
W
Won't Open
A failed mechanism, broken gearbox or jammed lock may prevent the door opening.
Related Guide
• Complete Homeowner's Guide to Door Problems & Repairs
Related Articles
• Door Key Turns but Door Won't Open
• Door Won't Open? Common Causes and Repairs
X
No common entries beginning with X.
Y
Yellowing uPVC
Exposure to UV light may affect appearance but rarely affects security.
Related Guide
• Complete Guide to uPVC Doors
Z
Zero Maintenance Myth
Modern doors require periodic maintenance to achieve their full lifespan.
Related Guide
• Complete Guide to uPVC Doors
Related Articles
• The Complete Guide to Looking After Your uPVC & Composite Door
Related Complete Guides
• Complete Homeowner's Guide to Door Problems & Repairs
• Complete Guide to Door Alignment & Lock Performance
• Complete Guide to Multipoint Locking Systems
• Complete Guide to uPVC Doors
• Complete Guide to Composite Doors
• Complete Guide to Door Components & Hardware
Conclusion
Understanding the warning signs of common door problems helps homeowners identify faults early, prevent unnecessary damage and make informed decisions about repairs. From alignment issues and stiff locks to worn gearboxes and faulty handles, most problems follow recognisable patterns and can often be repaired without replacing the entire door.
Use this A–Z guide as a quick reference, then follow the links to our detailed guides and articles for more in-depth explanations and practical advice.
