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Hello there, Looks like a shock arrester.......probably installed to prevent banging from the pipes when a particular tap/ washing machine valve or whatever is operated. Regards Heeley

Thanks for the rapid response Tony. I'll phone Vaillant first thing. I chucked a combi out only this afternoon, still, I don't think it was the best type to learn from, an ELM leblanc. I leave old boilers and radiators outside my mothers bed and breakfast and they disappear overnight...

About a week ago I installed a new Ecotec plus 624 system boiler together with a Vaillant unistor unvented cylinder VR 65 control centre and VRT 360 roomstat/programmer. Anyway all was running sweetly until today when the boiler refused to start up just showing F32 on its display, apparently...