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how to fix F1 code on glow worm?

F1 keep flashing on the display of my glow worm combi boiler. No hot water or central heating.
Pravin, November 2011
over heat cut out press reset and change NTC change both flow and return

ltd, November 2011
link Click here to see other fixes for Glow-worm Combi Boiler (specific model not provided).