Boot lock issue.

Hi.
Today I replaced the spring in my tailgate as it would only open with the key in the lock.
Now it opens fine but doesn't lock with the fob. It does however unlock.
Is this likely to be the central locking motor or is there something I haven't connected up???
It started raining and got dark half way through so ended up rushing a bit.
Cheers.

the most obvious reason is the motor

As sierrafery above ^^

If the actuator is operating but not locking or unlocking the door then there is a small amount of adjustment available on the actuator mounting plate only a few mil, so just undo the four screws very slightly and tap the plate one way or the other it's a very fine line adjustment and (sometimes ok sometimes not) with each tap try the locking/unlocking with your fob..