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Radiators not bleeding properly
Posted: Sat Nov 08, 2008 6:04 pm
by jamiebogle
I had a new central heating system installed a couple of years ago, and have occassionally had to bleed the odd radiator. However 3 radiators in the house don't bleed at all. When I turn the bleed valve there is no rushing off air coming out so the rads never get any better than luke warm.
Two of the rads are close to the boiler, one is downstairs.
Any help out there?
Posted: Sun Nov 09, 2008 4:29 am
by Steve the gas
Hi,
Only bleed rads with the system OFF.
Posted: Fri Nov 28, 2008 2:35 pm
by jamiebogle
That still hasn't worked. It's almost as though there is no pressure forcing the air out of the affected rads.
The pressure bar on the combi is what it should be however.
Any more ideas?
Posted: Fri Nov 28, 2008 2:51 pm
by htg engineer
As StG says, plus what kind of system is it ?
I'd imagine it will be pressurised with it only being a couple of years old. So what is the pressure gauge reading ?
htg
Posted: Fri Nov 28, 2008 3:37 pm
by jamiebogle
The boiler is a Worcester Greenstar 28i junior.
The pressure gauge reading is showing about 1 1/2 and the guide marker is 1, so there's slightly too much pressure in the system at the minute, but it always fluctuates anyway between 1 and 2 when the boiler is on, which I guess is to be expected.
Posted: Sat Nov 29, 2008 12:03 pm
by htg engineer
1.5 bar pressure is fine, very odd for a pressurised system not to refill easily.
Did you try venting the rads with the CH turned off ?
The vent may be blocked, turn off both rad valves, remove vent nipple and insert a pin into the rad vent point.
(this is in relation to other posts - this is a common fault especially if leak sealer has been added at some point, that's why i'd only use leak sealer as a last resort. Also causes problems with auto airvents)
htg