Hi we moved into a house 4 years ago, we never used the boiler for hw as it used to make a terrible banging sound and the flow pipe also bangs and what sound like gushing water. It seems to bang when the hw is turned on and when the ch and hw are on together and the ch goes off. The CH works fine when on by itself. Now we want to get it fixed as it costs to much to heat the hw using the hw cylinder. It is a worcester bosch 40 CDI conventional boiler, I had a plumber come round, he replaced the 3 way valve but still the banging continues any ideas would be welcomed.
Thanks Paul
Thanks Paul