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F1 and F4 error on Glow worm 30ci combi boiler?

My glow worm 30 ci combi has been regularly shutting down overnight and showing F1 in the LCD display. I can get it going again by switching it off and back on again but this morning when switching it back on, it showed an F4 error code - is this something serious?
duffers28, March 2011
link Click here to see other fixes for Glow-worm 30ci.