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Thank you very much for the information Muggles! Appreciated!!

Thanks for the replies. Another thing I must add is that after running the hot water for a decent amount of time (a shower for example) the boiler will show a red light with the F.75 code. Once the boiler is reset it returns to the sequence that I mentioned above.

Good evening, My boiler has started behaving strangely, it is a Vaillant Ecotec Pro 28. It seems to be half working and by that I mean the radiators are hot but it isn't heating the room as it was and is only achieving around 16.5 degrees. The boiler seems to be starting fine, then shutting...