Help my boiler will not fire up!? new boiler underneath 5 years old. it have automatic ignition. I...

new boiler underneath 5 years old. it have automatic ignition. I have followed the directions, turn bad gas turn off power, the turn gas fund on then power but it does not hurricane lantern. It has power the automatic blower comes on but it will not ignight. I am assuming it is the thermo coupler but not sure. The contractor who installed it have since died. any suggestions??