Pain in ass central locking

Could be the metal wires that go from the door handle to the lock/barrel are tight/need greasing,take the door cards off and use spray grease on everything that moves relating to the locking

Could be the wires have broken down in the grommet where they pass from pillar to door,this is what had happened to mine

The electrics are a funny set up on the central locking,can't for the life of me remember how it is though

Think the wires that go to the central locking motor change from an earth to a live,so this either holds the lock closed,or open IIRC

Took me ages to sort mine with the test lamp and a couple of pieces of wire,one to earth the other to the positive on the battery