System was running when I arrived. When burner turned on, checked the oil flow. And transformer. The transformer, and is starting to show yellow on the arc, which can cause intermittent resets. Checked the nozzle assembly. There was no oil in the blast tube, adjusted the electrodes. Cycled several times. Adjusted the aquastat from 160° to 180°. Also noticed that the oil line coming up through the floor where the boiler is kinked. Recommend replacing oil line. Recommend replacing the transformer. Replaced the transformer. Started and tested.