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f9 fault?

when i switch domestic hot water on boiler runs for30 seckonds then trip out on fault f9
boiler make is glow worm C30I I have replacedflow sensor.
larry horgan, February 2005
if you mean a glowworm 30cl then f 09 and flashing red LED.its a water pressure sensor fault

paul, May 2007
link Click here to see other fixes for Glow-worm C30I.