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how can i fix my Glow-worm 30ci boiler?

the glowworm 30ci boiler is 3 years old and we have no heating and hot water and the boiler is flashing F9 we have replaced the pcb board and the thermistor and still it is not working
David Blakely, December 2006
HI I THOUGHT THE F9 FAULT WAS LOW PRESSURE or pressure sensor?
Ray

Ray brown, August 2007
link Click here to see other fixes for Glow-Worm.