Two of the eight radiators in my house get only lukewarm. All eight radiators have been bled. The inlet pipes to the two dodgy radiators are red hot so the problem appears to be with the valves. I have tried to loosen one of the valves by removing the plastic cover and then tapping the top of the valve gently with a hammer but there was no improvement.
I have read plenty of advice on the web about loosening the pin in the valve but this seems to be inaccessible.
Could anybody advise what I can do to get the radiators working?
Best Answer
A possible cause for your problem could be air in your radiator.
You need to open this valve (try "unscrewing" it) to see if there is air in your radiator. It's simple but it can be dangerous : when there is no air anymore (assuming it is your problem) you will get very hot water, possibly with some pressure, so be careful. Then tighten the valve again, wait ten minutes and see if there is a difference.