There is no pilot light on the 24i, it has electronic (spark) ignition.
If the boiler is not firing, check the overheat stat on the top of the casing (top left). If it's popped out, push it in.
Check your pressure gauge, if it's on zero (or close) top it up to 1.5. If you need help doing it, ask.
BunSlinger
September 2008