I am recently finding that when it's cold the burner is taking quite a long time to establish a flame. It will ignite for several seconds, stop, re-ignite and so on for a period of several minutes and multiple re-ignitions before the flame is permanently established. It does not lock out. Once everything is warmed up it will establish a flame immediately.
I fitted a new Danfoss nozzle last July during the annual service. The oil pump is a little noisy but the pressure is running at the specified 70 psi. The two oil filters are clean. No water in oil tank (tested with water finding paste). I haven't used a combustion analyser or smoke pump for some time but the flame looks about right.
Before I take a closer look I will appreciate comments on possible causes of the problem. I'm considering the photoelectric cell, the oil pump solenoid coil or possibly the control box.
Any comments much appreciated. J.