Daewoo water dispenser not working

Hi, I have a Daewoo side by side fridge freezer.
Model DRS30DSMB

the water dispenser on the above fridge/freezer has recently stopped working.

the ice maker still works as normal and when you press the water dispenser button the light comes on and there is a clicking sound from the top/back of the fridge.

a couple of weeks ago the water stopped working periodically but came back after a while now it seems to have stopped working altogether.

do you have any idea what may be causing this and which parts I need to replace to solve the problem.

any help would be appreciated
many thanks for your time, craig