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Mend Glow-worm Comi Boiler Fault Code Heating

how can i fix my glow worm comi boiler?

my boiler seems to want to work but goes so long then trips out and showing the fault f4 any ideas

derek
August 2016
Glow-wormGlow-worm ComiHeating, Home Heating SystemsBoiler Fault Code Heating

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