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what dose fault f4 mean?

hi i have a glow wormflexicom 12hx and it keeps flashing f4 everytime i turn it on i no f4 means theres a fault somwhere but what is the fault
david, December 2010
it can mean a lot of things but the first one I would check would be the condesate pipe it may iced up for more info go to glow worm web site click on trade tab and you can view and download info on your boiler for future reference

brian, December 2010