Citroen C3 cenral locking problem?

Got a C3 which wont lock on the key fob on the drivers door only, all the other doors all work fine but not the drivers. Tried reprograming the key and now tried a new drivers door locking mechanism but still now joy. The door locks and unlocks manualy but central locking doesn't work when using the key manualy although I think the car doesn't have cenral locking when using the key manualy. Any Idea's welcome.