Some boilers have manual ignition for the pilot flame
Some boilers have automatic ignition
Some boilers have no pilot
On my boiler, when there's a call for heat, the fan runs - you can hear it - then a pressure switch detects that the fan is running OK and only then will the control board open the pilot-flame gas-valve and strike a spark - bingo!
There's a window to look through
Peccavi
November 2009