Hi, I have a problem with the central locking on my 100HP. When you lock it with the remote it locks and then immediately unlocks itself! You can manually lock it with the key but again it unlocks itself. The only thing that remains locked is the hatch which has to be opened with the key. The car is currently insecure, any ideas?

Welcome to the forum.

As this post is 3 weeks old this may be of no use anymore, but the reason this is happening is that the car sees one door (or the boot) as opened.
You can manually lock the doors from the inside every time and then the drivers door from the outside, that should be OK.
To fix it it gets tricky as you will need to find witch of the locks is sending the"door open" signal.

Cheers,
Dan

I forgot to add that you need to remove the fuse for the central locking system, F38 (20A) from the fuse box from inside the car. You can find it's location in the owners manual.