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pressure gauge falling?

the black needle on Glow-worm swift flow 80 combi boiler is low, but it also flickers when you turn on the hot water.(black needle on pressure gauge )
how do I fix it
alistair, July 2009
Find the Filling Loop on your system, open the valves untill the Boiler Gauge reads 1.00 Bar, then close the Filling loop valves

www.elanar.co.uk, July 2009
link Click here to see other fixes for Glow-Worm.