Technical data

50
Does sparking start?
Go to sheet .H
Does yellow ignition indicator ( ) flash after 30s?
Replace electronic boards.
Check operation of differential pressure switch
Sheet F
Has system been filled with water?
Is solenoid activated? Is differential pressure switch activated? Check for dirt or damage to the differential switch, supply tubes and diaphragm.
Go to sheet G.
Yes
Yes
No
Yes No
No
No
Yes
Fill and vent system and boiler.
No
Check continuity of microswitch. Replace if necessary. Check connection of ribbon plug to switch board. If burner still fails to light, replace electronic boards.
Yes