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Still not working properly. It seems that on hot water only I am getting a lot of pipe banging and poor performance of the system. The central heating seems OK. Aay ideas before I call in a professional.

I've installed these - in a word -rubbish! Go for a known brand - Steelmate, Laserline or Cobra.

I pinned it and got some air out -- I will do as you say and come back to you. Thanks Bob

Bob - should the system be running or off? before I poke the pin in? Is there a little air gallery that blocks up over time? Should I let a little escape before replacing the cap? Thanks

I did as craig suggested but didnt get any air or water out of the valve? When on heating and water the system is quiet, but with heating only it still knocks a lot! I have had the immersion on but the mrs claims there is not much hot water. gas4you - the little cap seems to screw right...

Thanks for all your help Craig - i will post back how I went on. I have tried loosening that valve but nothing appears to exhaust from it? I will try again tomoorw. Hole in one for you! Nick

Thanks Craig - what does the air vent at the cylinder look like - is it like this?

Craig, should I bleed at the radiators or somewhere else in the system?

Thanks CLF Any ideas why it would be noisy with the HW on? It seems fine now just the CH. I will try it again in the morning

Hi guys, gas4you - i am getting water out of the rads. clf-gas - what does the by-pass do? I have it open at the moment With central heating only (no HW) the system seems to work OK.

Is there any other way of expelling air from the hot water system. By bleeding radiators I dont seem to be getting any air escaping but I'm sure the hot water system has a lot of air in it. I assume that bleeeding teh radiators only affects the heating - not the hot water?

Hi Bob, I have opened the bleed and no air seemed to have escaped - I'm not sure how far they open those little bleeders - if you undo them too far do they fall apart? The tap in what you think is the cold water feed I felt sure was closed, there is another bigger tap higher up that is...

Hi I am new here and I am looking for a little advise. I recently had a leak from the waste water pipe on my bath, at the time I did'nt know what the problem was - just water dripping through the kitchen light ! I turned off the cold water and ran the hot tap until it was running dry ( 1st...