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Hot water tank - not sure of diff tank and cylinder. Large metal vessel shaped like sausage. Hot water pipe I think runs through in coil to heat surrounding water in vessel. F&E is in loft - so floor above. When I refilled CH system the rads upstairs did not refill quickly. Did at first...

No - upstairs water does not squirt out forceably. Water is clear - very little sediment (have flushed out each readiator individually in the last year). By tank I mean hot water tank. So - if upstairs is air locked and rads are closed downstairs then water still has two routes left - the...

Didn't work. I have no shut off valve to my central heating tank which means that given two paths of blowing out an air bubble and cycling through the tank it looks to be going for the latter (i.e. least resistance). I could put a valve in to allow me to shut off the route to the tank...

Okay - will try this tonight. Thanks (hopefully this will fix)

I am poor on definitions. Two pipes run through the system - one carrying hot from boiler the other cold from end of rads. Rads branch off from the 22mm pipes as they run through house (as far as I have taken floorboards up in the past). The 2 rads disconnected downstairs are branches...

I drained down system to add a rad and move another downstairs. These rads are still off but central heating system is refilled and on (i.e. valves to these rads are closed). Conventional boiler with pump and feed&expansion tank in loft. I get heat on downstairs rads but not upstairs. Have...