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- 15 Feb 2021
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Hi I also have a 552 which has been banging for a while. Mine starts banging when the boiler shuts off on the room stat. Seems worse when boiler stay set to low and room stat set to 20. Did it lesson recent cold spell with boiler set to 1 and room stat set to 25. what is noticeable though is that the domestic water temp seems to be much higher than the heating water. Don’t understand why as tne heating and indirect is the same water !! Any suggestions please