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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
Glow WormGlow Worm 18HXIHeating, Home Heating SystemsBoiler Error Heating
F9 Means faulty water pressure switch/sensor. Check water pressure in system, the wiring, test the switch and replace if nedded!

mark
October 2009

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Glow Worm 18HXI F9 Error - Fix & Meaning