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by using the drain valves. All three rad's downstairs have them and none work. Have given all of them a good tap with the spanner to loosen any potential debris. Still no luck. Not so much as dribble. They have all worked in the last 3 years as i have removed them all for decorating.

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...

Thanks yo all the suggestions. I am pretty limited with plumbing knowledge so i have kept to what i can do. I tried to drain the whole system but cannot get any of the radiators downstairs to empty. Not sure if this would suggest anything else. I have had Fernox F3 in the system for...

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...