How to Fix a Leaking Caroma Slimline Cistern

Remove the lid to the toilet cistern. Lift it off vertically and set it aside. Look and listen for the leak. As there are many washers, inlet and outlet pipes, there could be a number of locations for leaks to occur.

Turn off the water inlet valve. This will be a knob located behind the toilet, coming from the wall or floor, leading to the cistern. Turn it clockwise until closed.

Flush the toilet by pressing the flush button. This will drain the water from the toilet making access to the washers easier, but the cistern will not refill as the water has been turned off.

Remove the float ball. To do this, push out the plastic pin that holds the float arm to the water control assembly then lift out and set it aside.

Unscrew the exposed cap under the float arm and lift the exposed water control assembly up and out. Turn it over to find the rubber seal. If damaged replace with a similar type commonly found at home building stores.