If Your Door Locks with the Door Open but Not When It's Closed

If your door lock works perfectly when the door is open but becomes stiff or won't lock once it's closed, the lock itself is often not the problem.

This is one of the most common faults we see, and it's usually caused by the door no longer lining up correctly with the frame. The good news is that, in most cases, it can be repaired without replacing the door.

Why Does It Work When the Door Is Open?

With the door open, there's no pressure on the locking mechanism.

The:

• Hooks
• Rollers
• Deadbolts
• Latch
• Gearbox

can all move freely because they're not trying to engage with the keeps in the frame.

When you close the door, everything has to line up perfectly. If it doesn't, the mechanism has to work much harder.

This simple test is one of the quickest ways to identify whether the fault lies with the door or the lock. – Every Door Problem Isn't a Lock Problem explains why this distinction is so important.

The Door May Have Dropped

The most common cause is a door that has gradually dropped on its hinges.

This can happen because of:

• Everyday use
• The weight of the door
• Hinge wear
• Natural movement over time

Even a small movement of a few millimetres can stop the locking points lining up correctly. – Why Door Alignment Matters explains how even slight movement can place the entire locking mechanism under strain.

Misaligned Keeps

The metal keeps fitted to the frame must line up precisely with the hooks, rollers and deadbolts.

If they don't, you may notice:

• The handle becoming difficult to lift.
• The key becoming stiff.
• The door needing to be pushed or pulled.
• The lock only working with force.

The lock is working exactly as it should—it's simply meeting resistance.

Don't Keep Forcing It

Many homeowners continue forcing the handle because the lock still works.

Unfortunately, this can lead to:

• Gearbox failure
• Worn locking points
• Broken handles
• Internal mechanism damage

A simple alignment issue can eventually become a much more expensive repair. If your handle is already becoming stiff, – How a Stiff Handle Can Lead to Lock Failure explains how continued strain can damage the mechanism.

Could It Be the Gearbox?

Sometimes the gearbox has already been damaged by months of operating under strain.

Signs include:

• The handle feeling rough.
• Grinding or clicking noises.
• The key becoming harder to turn.
• The lock working inconsistently.

If this has happened, the gearbox may also need replacing. A professional diagnosis will determine whether the gearbox has actually failed or whether it's simply reacting to another fault, as explained in – Door Lock Troubleshooting Guide.

How the Problem Is Repaired

The repair depends on what's been damaged.

It may involve:

• Realigning the door
• Adjusting the hinges
• Replacing the gearbox
• Replacing the complete multipoint locking mechanism
• Replacing worn handles if required

The important thing is to correct the underlying alignment problem as well as replacing any worn parts.

Why Realignment Is Essential

A new gearbox or locking mechanism won't last long if the door is still out of alignment.

A professional repair should always include checking that:

• The door sits squarely in the frame.
• The locking points enter the keeps freely.
• The handle lifts without excessive effort.
• The key turns smoothly.
• No unnecessary pressure is placed on the mechanism.

This helps maximise the lifespan of the replacement parts. If your door also needs lifting before it will lock, – Why Won't My Door Lock Unless I Lift the Handle? explains why these two faults are often connected.

Most Doors Don't Need Replacing

If your lock works perfectly with the door open but not when it's closed, the door itself is usually still perfectly serviceable.

Most repairs involve correcting the alignment and replacing any components that have been damaged through wear.

Fix the Alignment Before the Lock Fails

A door that only locks when it's open is giving you an early warning that something isn't right. Ignoring the problem and continuing to force the handle can quickly turn a simple adjustment into a failed gearbox or damaged multipoint locking mechanism. In most cases, a professional realignment combined with replacing any worn components will restore smooth, reliable operation and allow you to keep the door you already have. If the lock is already becoming stiff or difficult to operate, – Why Is My Door Lock Stiff? explains the warning signs to look for before a minor fault becomes a major repair.