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Thanks for the replies, but noooo, please don't say the pump may be forked(!) :shock: . How would this create smokiness? I've just replaced the mototrised valve (both motor and actual valve) - would this play any part?

Hi, Worcester heatslave 15/19 oil-fired combi boiler. This morning the flue started giving out a little bit of black smoke. It wasn't much, but quite smelly. The boiler is still working, but I was wondering about cleaning out the burner. I've got the instructions for it, which says that the...

Hi all, Can't quite find my problem here, and I have searched, honest... First off, it's a Worcester 15/19 Oil fired combi. Problem: Hot water ON, CH ON. Hot water *very* hot. Rads cold. Switching the valve thing so that it holds on CH resolves the problem. This suggests that the valve...