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Thanks for all your suggestions. Ended up taking the floorboards up downstairs and found a pipe that was sagging. Cured this by refastening it to the joists, drained the system down through the same side of the system that had the pipe problem and a large amount of air came out. Refilled the...

We have tried closing all the radiators to get the flow to the downstairs. Currently all the radiators upstairs are on reduced flow as they don't need to be fully open, the only two that are fully open are the downstairs 2, but there is no heat in these what so ever

All valves are open We have taken the top off the thermostatic valves and the 'needle' moves up and down freely and isn't stuck

We have a problem with the central heating not working downstairs though everything is fine upstairs. I have looked through your FAQ and done some of the things suggested in there (with the help of my dad who is a recently retired heating engineer). The boiler is a Vokera syntesi 25e and was...