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hello chris , thanks for your reply . in answer to your questions turning on more than one hot tap makes no differrence idont think flow is restricted in any way and no clicking sound from boiler but a rushing sound every 10 seconds or so. any further ideas greatly appreciated.

Hello, i wonder if anyone can help. 18 months ago I had a vaillant turbo max pro fitted. This has worked fine until now 3 days ago I noticed that when the hot water is running it fluctuates between hot and luke warm. all the indicator lights light in the correct order, the central...