banging pipes

20 Dec 2014
Reaction score
United Kingdom

I wonder if you could help me. We recently add radiator into a bathroom and when we start have heating on we noticed a loud banging noise from the pipes. The noise sounds like pipes "twanging" and banging. This banging occur from a start when the CH comes on and when cooling down. The noise we are experiencing upstairs of the house

The Boiler is a Worcester Greenstar 255i/30Si
The CH and hot water do work fine and heat up quickly, (it does not make any noise when the radiators hot).
What we did:
-We insulated around the pipes so they sit tight
-We did bled the radiators
-when we drop the pressure from 2 to 1.5 bar the noise comes but took it longer to get the noise, a ticking noise (I assume expansion) and every now on loud bang from pipes
-sometimes when we turning the radiator valves from ( max to *) we get loud click , that happened upstairs and downstairs of valves
-couple times when we had air comes from a radiator even we did bled the radiators before
Can anyone help? - do I have air in the system? – valves problem?

Thanks everyone in advance.
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