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potterton performa 24 preasure riseing?

the pressure keeps going up every time the boiler fires up. i reduce the pressure back to 1 bar but it climbes every time . The filling loop is not connected .
chris, October 2009
flat expansion vessel, needs re-charging to just under 1 bar with a footpump-best to get experienced engineer to carry out this

STUBOW, October 2009
link Click here to see other fixes for Potterton.