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Worcester Bosch 28cdi vents water?

My 28 CDI vents water through the over pressure valve. I have replaced the valve but it still keeps venting especially with the CH demand. I haven't noticed the system pressure rise above 2 bar with the system operating. Everything else works fine.
Avro 1, October 2010
It is the expansion vessel which may either need recharged to 12 psi or far more likely it needs replaced

jimmy, October 2010
check the expantion vessel

b, October 2010
link Click here to see other fixes for Worcester Bosch 28CDI.