radiator not working

doublejj

unusual problem..al rads upstairs and downstairs except one in upstairs bedroom...tried bleeding ect....i then disconnected both flow and return and ran hose out window clamped on hose and switched on heating,again no flow at all couple dribbles ..what could stop water coming to one rad??

Billy Bunting

Is the pipework plastic ?? Qualpex/Acorn

doublejj

yeah qualpex

Billy Bunting

possible kinked pipe.

doublejj

maybe but wonder how and where.....had this rad off for while before with cople others heat returned to others after bleeding but not this...possible airlock i wonder?

DanWall

Is the system balance? The furthest radiator from the pump must have the locksheild valve wide open, the other radiators must be reduced progressively depending on distance from the pump to allow pressure to reach the furthest radiator.

dm1388

you could try turning off all the other rads and leave the heating on, this has worked a treat for me many times

heinbloed

The OP asks:

what could stop water coming to one rad?

Bad or no system balancing at all.

d o'c

doublejj wrote: »

unusual problem..al rads upstairs and downstairs except one in upstairs bedroom...tried bleeding ect....i then disconnected both flow and return and ran hose out window clamped on hose and switched on heating,again no flow at all couple dribbles ..what could stop water coming to one rad??

disconnected but with rad valves still attached?
is it a trv type valve? stuck/ clogged valve possibly?

Cedrus

Is it a new or old installation? has the rad just stopped or has it been off for a while? Dirty install if new (plastic swarf in valve or rad) Sludge//rust if old? TRVs can stick badly specially if they're fitted against the flow or used as isolation valves during the summer.

doublejj

its about thirteen years old .....tried all of the above still no joy....nowater flowing there at all

Marcanthony

doublejj wrote: »

its about thirteen years old .....tried all of the above still no joy....nowater flowing there at all

you have a dead leg.:eek: or a kinked pipe

Have you got a high water demand from your cylinder/s or other appliances.

doublejj

low demand if anything.....cannot find a gauge on system to check pressure,or see how its pressurised....looks like a closed circuit

Marcanthony

doublejj wrote: »

low demand if anything.....cannot find a gauge on system to check pressure,or see how its pressurised....looks like a closed circuit

well its either a kinked pipe or a dead leg then.Do you know the distance between the pipework from the heat sourse to that radiator and size of pipework.

Or is the pipework creating air pockets. 90 degree bends on the pipework restricting the flow and causing the water to become stagment in that area.
A common example of this would be a sharp bend on the flow pipe feeding a hot water cylinder.