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Hi there I was wondering whether you could help...i checked the pressure of my combi boiler today and it was above 3...i was told to make sure it is between 1 and 2...how can i reduce the pressure...I hope you can help as i have no clue about boilers! thanks!

Hi there I was wondering whether you could helpo...i checked the pressure of my combi boiler today and it was above 3...i was told to make sure it is between 1 and 2...how can i reduce the pressure...I hope you can help as i have no clue about boilers! thanks!