Daewoo DRS30DSMB

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

the water dispenser on the above fridge/freezer is playing up.

the water dispenser seems to work fine for a couple of weeks then stops working for a few days before starting to work again.
during the periods it isn’t working the water dispenser light comes on when you press the lever and there is a clicking sound from the top/back of the fridge but no water

the ice maker still works as normal at all times.

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