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.
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.
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)
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