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It's a Ravenheat CSI85T Unfortunately... no... it's never been serviced :roll: I was hoping that it might be something fairly simple such as the microswitch/shunt valve (not that I actually know how easy that would be to replace! :? )

2 year old Ravenheat condensing boiler... hot water cuts in and out. The boiler can be heard firing up and the water starts to come hot... then the boiler can be heard to cut out... and it goes cold. This problem has been getting worse over the past few weeks. Initially, the boiler would only...