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Hi Thanks for the reply/suggestions. I have vented the system numerous times. I have increased the pump speed unfortunately the banging still persists. Regards.

Baxi Back Boiler I have recently had a new boiler installed (9 months). The installer has emigrated. There is quite a lot of banging coming from the boiler - Is it possible to connect the cold water feed incorrectly lets say to the top of the boiler when it should be to the bottom and this...