Glow worm 330 gas boiler F5 fault code?
 
                Ours has shut down three times in two months due to this fault code, and each time it resets ok when I remove the covers and press the red reset button. This appears to be only a short term solution however, so if anyone can shed any light on what is causing it, I'd be grateful.
            
             Lloyd
            
 March 2010