1If your tap hisses and bubbles then stops, the most likely cause is an airlock. Connect one end of a hose pipe to the problem tap and connect the other end to a mains pipe – the cold water tap in your kitchen is ideal.
2When the pipe is connected turn on the faulty tap followed by the mains tap. The pressure from the mains tap should blow the air bubble out of the pipe.
3If you have an airlock in a kitchen mixer, simply remove the swivel spout and hold a cloth firmly over the hole. Turn on the hot water first and then follow with the cold tap.