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Mend Glowworm CXI Heating Fault Systems

What does F12 fault mean on glowworm boiler?

My glowworm cxi has flashed up with an F3 then an F12 fault, how can i fix it and what does it mean?

Sam
November 2011
GlowwormGlowworm CXIHeating, Home Heating SystemsHeating Fault Systems

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