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How can i fix it,Glow-worm swiftflow 80,?

Whats wrong with it ? On heating the pressure soon gets up & blows off through the valve ! Starting pressure, cold, 1.0 -1.5 bar ! Pump running ! Rads getting warm
Ken Rhodes, October 2006
it sounds like the expansion vessel is at fault and needs replacing

barry, March 2007
Could be your pressure vessel needs re-pressurising or replacing.

Ken, October 2006
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