Appliance Repair Questions? Ask a Technician for Answers ASAP
How recently did you have an oil delivery?Also, have you checked the condition of the external in-line filter?
How low did the oil get before delivery?
OK. It's still worth checking the filter in case the delivery churned up some gunge that then entered the oil line. If that's clear and/or after you clear it the fault still persists, then the next stage would be check the electrode distance and gap.Could you let me know the exact model of your boiler?
For completeness, here's a further list of possibilities:Air in oil line or pump;Ignition transformer or leads faulty;Electrode insulation faulty;Pump pressure too low.Does the burner actually ignite, and then go out, or does it fail to ignite?
I notice that you wrote "a had a look at it and cleaned the photocell", but a words seems to be missing from that sentence. Did you clean the photocell yourself?My questions are leading toward the idea that the photocell could well be dirty again, and if that's the case then the possible cause could be oxygen-starved combustion, which would generate too much soot.