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The bleed valve leaks water constantly when open, steam when boiler is going crazy. So have kept it shut when running and released steam after cutting out, but it obviously needs fixing! We added inhibitor last night but still the longest it has run without going bang is only 20 mins - and...

Thanks for all your help. The 'black knob' is on a screw thread, so have closed it down and run the boiler on min. It appears to be ok on this setting. It has heated up and cut out normally when up to temperature. Have watched it do this a couple of times. OK, so I will sort out some...

maybe it looked rusty because of dirt on top of the boiler?! The water is now clear, but still seeping out...

Hello Brian, I have a worrying new symptom - went downstairs to try out your suggestion of turning the stat down and there was water dripping from the boiler. This is coming from a small black valve on the top and is frothing slightly and looks rusty in colour. I have turned everything...

I have been hunting through old questions but can't seem to find the answer to this - apologies if I've missed it somewhere. I have a Worcester 24SBi on a sealed system which serves the central heating and hot water (in pressurised tank). Boiler is about 2 years old and up until 2 days ago...