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Mend Glow-worm 12HXI Glowworm Boiler Fault

glow worm 12hxi?

I have a fault F5 on the boiler could you tell me what this means please

Angela Walker
December 2011
Glow-wormGlow-worm 12HXIHeating, Home Heating SystemsGlowworm Boiler Fault

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Glow-worm 12HXI Fault F5 - Meaning & Fix