Itcould be one of several faults,it sounds likely to be a faulty photo cell. It also could be no ignition (spark)
Is the oil getting to the oil pump? If it is, is the o.p.p.
correct? and it is possible it could be the control box.
Possibly ,perhaps the nozzle is blocked? Sorry if this is confusing, but you do need a good engineer to take a look at it .
I. Short
October 2010