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Hello cross thread, Is there a way to test that? Also can the main heat exchanger be ruled out?

Hello, I have an issue with my Potterton Promax 33 Boiler Issue today, it is making a banging noise around 30 secs after opening the hot water water or turning on the central heating. Firstly, I thought it is the plate heat exchanger but I thought that would only cause banging noises upon DHW...