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@JoeSelv ... please do not make any attempts to fire up it.... with all due respect to you , I totally agree with @Jamie Hall and @EdTheHeaterMan ... just 45 seconds of oil in the chamber itself can have a enough fuel to blow up in side... it sounds like you must have lots of oil waiting to catch fire at once.... it has no place to go all at once.. only some ignited fuel will go out of the chimney... rest of the ignited fuel will cause serious damage to property and serious harm to anyone around... Please find a Pro ( there is a find a contractor section on this site.) Make sure you INFORM the tech what you have done and especially tell him / her how many times you press the reset button... and give him / her heads up of what we all mentioned... that there is a lot of fuel in the chamber ... I would contact the admin of the site and ask her to close this discussion so nobody will try to give you any suggestions on how to fix your burner issue. Contact a Pro...
best!

A pro told me how to fire up my boiler. with a little common sense it worked. I just did not have recent fuel in the fire box. I could not have had recent fuel in the fire box because the nozzle was plugged so no oil could be sprayed through it.

@cutter .. this is what you mentioned above... " I learned on here do not press the reset button. My oil burner had not been fired in over 10 years. " @JoeSelv situation is much different than yours and it is a dangerous situation ... I know you are trying to help @JoeSelv ... trust me @Jamie Hall , @Steamhead @EdTheHeaterMan knows what they are talking about and they have probably combined over 100 years of experience in dealing with heating systems... Its ok to say to someone, that not to do things that is dangerous.... we are all here to help....

The three people you mentioned above are pro's, no doubt about that. I just gave joe a suggestion. If he checks the fire box and finds it dry. Which he should if the nozzle is plugged. And if he makes sure the control has power to the burner. But that would be hard without the switch on to fire the boiler. He could remove the black wire from the burner terminal. Without wet oil in the fire box I would think all that could happen would be that the boiler would not fire again just like in the past. In my case here there are very few oil guys. Most residential is natural gas. I was told oil is cheaper in the north east U.S. The oil guy I wanted was going in for hip surgery and would be laid up till February. I was going on a trip so he gave me advise. the trip got cancelled because of Covid 19. I ran the boiler for two days with no problem. I am back on wood so I do not need the oil. Oil here is around $2.30 a gallon and I would burn around 850 gallons a year.

I had the same problem you have only I did not change any component's in the gun. I learned on here do not press the reset button. My oil burner had not been fired in over 10 years. I cleaned electrodes and set them correctly. Turned on switch and the pump and fan ran, but would not fire. The control may have shut down the pump and blower fan. I tried it one more time and same thing. Now 2 years later a burner man told me that a nozzle that has not had oil going through it regularly would clog up, another burner man told me that nozzle should be changed regularly. So a new nozzle was put in the gun was blown out with compressed air. Oil was turned on switch was turned on and nothing happened. The blower fan would not run, and I believe that also runs the pump. I checked for power in the control at the burner terminals and had no power. I checked for power coming into the controls and there was power. Then I said I wonder what will happen if I press the reset button. With the power off to the control I pressed the reset, then flipped the switch to turn on the boiler. The burner sounded just like I started my car, maybe a little louder, but sure sounded good. Change nozzle and make sure electrodes are set correctly.