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Worcester green star junior 24i?

My husband has just removed a radiator. The bar pressure was running low before he removed it and so he increased the bar pressure to 1.5. He has just switched heating on and the bar pressure has gone into the red 3.2, when boiler switches on. Any ideas?
Steve, December 2013
expansion vessel

http://www.youtube.com/watch?v=KeO2gswQQe4

Q, December 2013
link Click here to see other fixes for Worcester 24i.