pilot was on. turned on tap no main burner maybe air pressure switch as number 7 led is not on.now i have no pilot light , the make of boiler is ferroli combi 77 ff

d brown, July 2010

Best I can do in sequence, I no longer keep anything on this boiler

Is water flow switch operating?
Does the pump operate?
Does fan go from low speed to high speed?
Does the FPS make?
Is there 24vdc to the gas valve?

Go through these in sequence (electrically testing where required) and you will find the problem.

Carefree, July 2010