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What F9 mean on a Glow Worm Boiler model 18hxi?

Boiler not working Cde F9 flashing not in book
Keith Dixon, January 2009
F9 Means faulty water pressure switch/sensor. Check water pressure in system, the wiring, test the switch and replace if nedded!

mark, October 2009
link Click here to see other fixes for Glow Worm 18HXI.