 
                 
                I have a 30cx glowwarm that is showing F4 as fault.I have no hot water?
 
                My central heating is not working?
 
                My radiators not heating up?
 
                Which way to turn slotted screw to adjust water pressure up on a glow worm ?
 
                How to fix glow worm 18 hxi ?
 
                BMU error code?