406 door locking

[Des Murphy]

The central locking works fine but the left back door will not open. If I repeatedly hit the door where the lock is while at the same time activate the key to open, I can (after many tries) get it to open. It will then work perfectly for a day or so. I opened it up and could see no problem.
Can anyone help?

Des Murphy

 

[MIKE ROCHE]

Des
Had the same problem with mine, first with one rear lock which was replaced (not cheap £80) for the MOT (you have to be able to get in all doors). The second time affected the opposite rear door. It did free after a time. I identified the fault as being caused by the dead lock facility so I nolonger use this facility. Incidentally the lock is fully made of plastic and has to be broken to remove if the lock will not open. The lock is not possible to be repaired as it is assembled as a heat welded plastic enclosure.
Mike