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Mend Glow-worm swiftflow 80 Pressure Cold

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
Glow-wormGlow-worm swiftflow 80Heating, Home Heating Systems80 Pressure Cold
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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Glow-worm Swiftflow 80: High Pressure Issue