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Whilst trying to resolve a cold radiator i have discovered that i cannot drain the whole CH system. I have tried draining from all the radiators on the ground floor but nothing comes out of any of them. There is water flowing trough them as all heat up. I can drain the first floor by...

I have one cold radiator situated in the bathroom when all other rad's are hot. Through the various steps i have narrowed it down to either a blockage in the pipe (8mm microbore) or a faulty Yorkshire Maxitwin Rad Valve. Having taken the rad off i have established the inlet valve trickles...