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My valiant Water level keeps on rising slowly and starts going out the over?

flow pipe. it seems to rise quicker when i put heating on
tom ball, December 2006
plate to plate heat exchanger may have gone does it take hours to over pressure

paul, December 2006
You need to check your expansion vessel, it should have 1 bar air pressure with no water in the boiler...

GasAid.co.uk, December 2006