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s30 heatline pressure keeps going above 3 bar ?

the combi heatline s30 pressure in boiler keeps going up above the limt even though the loop filler is not switched on can anyone suggest possible cause
frnky500, November 2008
disconnect filling loop and wait if it still goes up its the plate to plate thats gone.

gasbanni, December 2008
i could be the expansion vessel. it need to be
repressurised or replaced

b, November 2008
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