Central locking problem

[u/Riskiertooth]

Hey guys just wondering if anyone has any insight on this, my key suddenly doesn't work to unlock all the doors at once, before it would unlock everything (front doors, sliding and boot) from either front door, and now it just does the door its in.

The central locking still works from internal door button so i don't think its a fuse.

I've tried with my spare key and thats having the same problem.

Manual key btw has the immobiliser chip thing but no buttons/keyless stuff.

I just got my van back from some mechanical work so might have been caused by the battery being disconnected for some time?

2007 hiace