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Mend Glow-worm 18HXI Boiler Heating Fault

glow worm boiler?

I have a glow worm boiler 18hxi and all though it comes on and starts to heat the water after a short time a fault f4 flashes and although the boiler seems to be on its not heating the water. Any idea how to fix it or who can fix it without costing a fortune

sue
November 2011
Glow-wormGlow-worm 18HXIHeating, Home Heating SystemsBoiler Heating Fault

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