HI.
THE PHOTO CELL COULD BE DIRTY OR SOOTED UP.
YOU MAY ALSO HAVE POOR COMBUSTION CAUSED BY A FAULTY OR PART BLOCKED NOZZLE OR FAULTY OIL PUMP? THE CELL ISSUE IS REALLY THE ONLY THING YOU CAN ATTEMPT TO CLEAN BUT IF IT IS SOOTED THERE WOULD BE A REASON FOR THAT. THE BEST THING YOU CAN DO IS RING AN OIL SERVICE ENGINEER . BUT MAKE SURE YOU HAVE PLENTY OF OIL IN THE TANK FIRST?
TERRY
June 2009