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Mend Grundfos E80 Boiler Pressure Central Heating

e80?

the pressure keeps rising even though I know the ball valves are shut for topping up. Cold standing pressure is around 1 1/2 bar, this seems to happen more after running hot water. I dont know if there's anyway it can get from hot water side into central heating side ?
This only happens now and again one day it will be ok all day long the next over 3 bar.
Any idea's

steve
December 2010
GrundfosGrundfos E80Heating, Home Heating SystemsBoiler Pressure Central Heating

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