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why doesn't my worcester greenstar 24i boiler fire up?

boiler appears to be ready to go but will not fire up when hot water wanted. Gas is on, electrics on, pressure ok.
peter, July 2009
1 demand
2 starting fan
3 bang in gas valve
4 ignition sparkling
5 flame
6 hot water!
7 no demand - bang in gas valve shut off

on which stage is your boiler after opening tap?

1 diverter valve need new membrane
2 under pressure switch need changing or maybe fan cleaning
3 spark generator dead
4 are you sure gas service valve under boiler is open? no monies in meter? gas pipe purged? then gas solenoid valve dead.
5 flame but only fiew of seconds, flame sensing device dead
6 go to bath, you stink!
7 get some beer from fridge

that in big shortcut....

Robert (Trebor Services), July 2009
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