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Hi All, Fresh problem with my Puma 80. I have scoured the forum but can't find a match, so here we go..... Everything seems to work OK, but when demand is on CH, after a few seconds of burner operation a knocking develops which builds into a steady rhythm until the burner cuts out...

Hello Experts, I have a Worcester Heatslave 9.24 BF combi boiler, with an open tank on the top. The boiler has the integrated programmer and a room stat that looks the same age as the boiler. The boiler is situated upstairs, the hot water is great and gets as hot as you expect. The...