written by Billboy123 on 01/01/2017
I have been very happy with boiler until now I have the 36/40 model, Over the last couple of weeks when switching heating to constant heating stays on for various times from one hour to three hours then switches off showing fault 4. press reset so I can receive hot water. any suggestions as to what I need to do to rectify problem. boiler approx. four years old. I have no pressure switch as it blew twice. installer never came back to solve this problem.