After putting the central heating on, after a few minutes the pipes start to bang, throughout the time the heating is on it gets less noisy, can you suggest a reason for this and how it can be cured. It has been drained and refilled and vented.
It has been going on for a few weeks, the only work we have had done is a replacement pressure relief valve and a new O ring on the 3 way diverter valve, the combi is a Valliant turbo max 828E, it was fitted on the 28/08/2000.
What is a TRV and would I require one to be fitted to orrect this problem
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