Introduction

Modern doors are designed to last for many years, but no door is completely maintenance-free. Every entrance door experiences thousands of opening and closing cycles, changing weather conditions and natural wear throughout its lifetime.

Most door failures don't happen overnight. Small changes such as a stiff handle, uneven gaps or a key that's becoming difficult to turn are often early warning signs that something within the door system has changed.

Many homeowners assume the lock has suddenly failed, when the real cause may be poor alignment, worn hinges, excessive compression or a tired gearbox. Understanding why doors fail makes it easier to identify developing problems, avoid unnecessary repairs and often prevents the need to replace perfectly serviceable doors.

This A–Z guide explains the most common reasons doors develop problems, why these faults occur and how many of them can be repaired before they become major failures.

Common Warning Signs

If you've noticed any of these symptoms, your door may be developing a fault.

• Door difficult to lock
• Door catches on the frame
• Handle feels stiff
• Handle won't spring back
• Key difficult to turn
• Key difficult to remove
• Door only locks when lifted
• Uneven gaps around the door
• Lock works with the door open but not closed
• Handle wont lift
• Door rubbing on the threshold

A

Alignment

The number one cause of door problems.

When a door moves even slightly, the locking points no longer line up correctly with the frame, placing additional strain on the lock, gearbox, handles and hinges.

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➡ Door Alignment & why a door problem isn't just a lock problem explained?

B

Building Movement

All buildings settle over time.

Small structural movement can affect the relationship between the door and its frame, eventually leading to locking and alignment problems.

C

Compression

Incorrect compression against the weather seals makes the door difficult to lock and increases wear on the locking mechanism.

D

Dropped Doors

Heavy doors gradually settle on their hinges through years of everyday use.

Even a few millimetres of movement can affect the entire locking system.

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E

Expansion

Heat causes uPVC, composite materials and metal components to expand.

Seasonal expansion often exposes existing alignment problems that may not be noticeable during colder weather.

Door works open but not closed?

F

Failed Gearbox

The gearbox is the heart of a multipoint locking mechanism.

After years of use, internal components gradually wear and may eventually fail.

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G

General Wear and Tear

Every moving component gradually wears through normal everyday use.

Regular maintenance helps extend the service life of the entire door.

H

Hinge Wear

Worn hinges allow the door to move lower or sideways.

Common symptoms include:

• Stiff handles
• Poor locking
• Uneven gaps
• Door rubbing the frame

I

Incorrect Installation

Poor installation may lead to:

• Uneven gaps
• Excessive compression
• Premature wear
• Ongoing alignment problems

J

Joint Movement

Movement where the frame sections join can gradually alter door alignment over time.

K

Keeps Becoming Misaligned

Frame keeps must line up precisely with the locking points.

Even slight movement can prevent smooth locking and place additional strain on the mechanism.

L

Lack of Lubrication

Moving components require occasional lubrication.

Dry moving parts experience greater friction, increased resistance and accelerated wear.

M

Misalignment

The most common cause of stiff locks, failed handles and worn gearboxes.

Fortunately, it is usually repairable through correct adjustment.

N

Neglected Maintenance

Small problems often become major repairs when ignored.

Routine maintenance helps prevent unnecessary wear and expensive failures.

O

Obsolete Components

Some older locking mechanisms are no longer manufactured.

However, compatible replacement parts or gearbox replacements are often still available.

P

Poor Quality Replacement Parts

Low-quality components may wear much more quickly than genuine or high-quality replacements, leading to repeated failures and reduced reliability.

Q

Quick DIY Repairs

Incorrect repairs may create:

• Misalignment
• Poor operation
• Reduced security
• Additional wear

Correct diagnosis is always more important than replacing parts.

R

Rust and Corrosion

Moisture and weather exposure gradually affect metal components, particularly on coastal properties or doors exposed to driving rain.

S

Seasonal Movement

Doors naturally expand and contract as temperatures change throughout the year.

These seasonal changes often highlight underlying alignment issues.

T

Threshold Wear

Damaged or obstructed thresholds can cause the door to rub, preventing the locking points from aligning correctly.

U

Uneven Door Gaps

Uneven gaps usually indicate the door has moved or the hinges require adjustment.

This is often one of the earliest visible signs of alignment problems.

V

Vibration

Years of repeated opening, closing and occasional slamming gradually loosen fixings and increase wear on moving parts.

W

Weather Exposure

Rain, frost, sunlight and changing temperatures all contribute to gradual wear over time.

Regular maintenance helps minimise their long-term effects.

X

eXcessive Force

Forcing stiff handles or keys often causes further damage to:

• Gearboxes
• Handles
• Cylinders
• Spindles

A healthy door should never require excessive force to operate.

Y

Years of Daily Use

A front door may be opened and closed many thousands of times every year.

Natural wear is inevitable, but timely maintenance and repairs can significantly extend its lifespan.

Z

Zero Maintenance

Many homeowners believe modern doors require no maintenance at all.

In reality, regular cleaning, lubrication, hinge checks and early adjustments help prevent many of the faults that eventually lead to expensive repairs.

Most Door Failures Can Be Prevented

Many door problems begin with small changes that are easy to overlook. A handle that becomes slightly stiff, a key that no longer turns as smoothly or a door that needs a little extra pressure to close are often early warning signs rather than major faults.

Addressing these issues promptly can prevent unnecessary wear on the gearbox, hinges, handles and locking mechanism, helping to avoid more expensive repairs while significantly extending the life of the entire door system.

For more detailed information, continue to our complete guides covering door problems, door alignment, multipoint locking systems, door components, uPVC doors and composite doors.