Clicking, tapping 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

Few days ago we took a floor board out to insulated the pipes around and where they touch the main cold water pipes.pressure stayed 1,2 bar
It was sounds that the noise was more quitet and less you could hear it. after 20 minut the noise come back but it was not loud as before.

The banging only appearing upstairs.
We tried to take thermostatic head off to see if that help but ididn't help, the click still continue.
The clicking sound comes when we turn the heating on, after while the banging comes ones every 20 second, then 5 second, 20 second until the radiators reach high temp.

In the bathroom I bled the radiator, twice this a month .
Do we need rebalanced our radiators?
Can anyone help?

Thanks everyone in advance.
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