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I'm assuming that the burner is an oil burner. The high voltage transformer applies about 27,000 volts to the spark gap at the oil nozzle. The Cad cell is aligned to detect the fire which fans out out of the nozzle. The spark has to be maintained if you are to get a flame. Have your tech change out the transformer. As you get heat off the burner, the internal temp of the burner goes up also and maybe because of the age of the unit, the insulation of the transformer has broken down and the xfmr short circuits and doesn't supply the high voltage to fire off the burner - no flame the unit goes into lockout which as you found out you have to reset. Have him also check the gap. too far apart and with vibration the gap might vary sometimes make up ok and other times too wide so no spark.
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