I had this very problem with my combi, bit of a design flaw imo. The locking lever is very susceptible to items in the van knocking it down, so it would lock closed and wouldn't open on the fob.
Since I have a shelf across the back of mine, crawling through to unlock was not so easy, but that was the only way to open it.
If yours is not opening on the fob, I bet that's what's happened to you.
My solution? I took the liner off and de-coupled the wire connecting the lever to the lock, making it useless. (How often do you need to deadlock a side door when you're inside the back of the van?)
Works fine now.[/quote
Thanks for your input m8, have checked that but is not the problem it appears to be an electrical fault, we are now looking at replacing the locking unit on the door. Thanks again.