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brilliant took your advice, cleaned the switch and hey presto..........no more banging! I suppose I could run an analogy to everyday life!! thanks again for the tips, you have no idea how happy I am

thanks for your replies, first time using this site, and hey, what a result. I feel suddenly surrounded by peeps with solutions, great. there is indeed "green/brown cack" (are you in the boiler ?) Thanks Bradleybear, now I at least understand a little more, will have faith to get in corgi...

thanks Kev elow switch or Diverter valve, ok will consider your advise. Is it still possible to get imformation for these boilers with respect to drawings, so that i can locate the Switch and valve you suggest?

I have a combi 80 boiler. Everything was going fine until other day. Ran hot tap upstairs for 5-10 mins. Switched off tap, then almighty babnging coming from boiler, which cut itself out. I released steam from top of boiler by turning plastic screw. Noise now happens everytime hotwater tap is...