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Solved! There was an old stop cock on the hot water pipe, just after the T for the kitchen sink. This was well past its best. Put a new one ina problems solved!

I've now got a list if things that happen. 1) Turn hot tap on in kitchen - all fine (hot water, normal flow) 2) Hot water not running at all upstairs taps or bath or shower. 3) Turn cold tap in upstairs sink on, then ease hot tap on and both flow. Turn cold off, knocking at hot stops...

have checked all isolators and all operational and wide open. I'm at a loss.

I'll have another look round at those. Thanks!

Thanks for the reply - pessure is just under 2 bar and the loop valve is closed off. I briefly managed to get one tap working at 50% power but as soon as I opening it up more, the pipes knocked hard, water spluttered and it stopped again. Is it possible to disconnect the hot water out pipe...

Hi, I searched on previous posts but can't see what I am after, plus i am clueless! I have a combi system and currently have a hot water problem. Essentially the boiler is working, the radiators are fine and no warning light are flashing. Its a Main Combi 30 HE. When I run the hot tap...