The lock mechanism may not work simply because the lock is dirty or dry and needs to be lubricated with graphite do not use any type of oil because this will gum up the works.
Lock on screen door not working.
This may be caused by the latch plates.
Pry up on it until it comes loose and remove it.
Firstly for a whitco mk ii tasman lock the lock needs to be in the locked position.
Tap the end of a chisel under the door stop on the striker side of the jamb.
You have a broken wire.
An improperly functioning latch may be the result of a poorly fitting door.
Sometimes this just takes patience.
Refer the link below for safe mode steps.
No it s all aligned the latch goes through the hole in the strike plate nicely once the auxiliary bolt is pressed.
Check if it helps.
If not proceed to the next method.
They work fine if you have room between the sliding door and the screen door.
Cylinder will then pull out.
Check if the issue persists in safe mode.
For other types of problems with door knobs and locks please see repairing door knobs hardware.
If it works sometimes you probably have a broken wire.
T s possible the door may not be aligned properly now so the latch is missing it s hole.
Some screen doors have no clearance at all.
If thats the case it still might be possible to replace the mortise style lock that was originally built into the door.
Sorry that we feel the need to state the obvious assuming that you re using the right key keep working it until it turns the lock.
If your door key doesn t work right the first and most obvious step is to be sure you re using the right key.
When your screen door won t latch properly and pops back open or does not close all the way the latch plate is in the wrong position on the doorjamb.
If it won t lock open the door.
The lock and strike plate were installed new yesterday.
Door key does not work.
Shut the door and try to lock it.
These locks mount right on the inside of the screen door.