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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
Heating, Home Heating SystemsModel Working Flashing
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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