A couple of things: 1. burner head burned off- this is very common w/ becketts esp. in an overfire situation or with deteriorating combustion chamber - which, by the look of your boiler is very likely, pull the blast tube and have a look
. 2. dirty electric eye. 3. bad carlin transformer 4. (very likely) bad motor.
Oil burners are not a very complex piece of equiptment, if you are so inclined, you might try a few things yourself before calling a tech, and you might learn a little bit about burners too:
I would approach this problem this way: 1. get yourself a (whatever gph your boiler calls for probably around 1.00)x80º hollow cone nozzle, pull blast tube, if retention head is burned off or damaged/carbon covered replace it (cheap part) w/ an "F 3" beckett head (will work for whatever gph you're firing). 2. take kleenex/windex and gently clean electric eye. 3. check combusion chamber for excess soot/ be sure boiler passages are not sooted up. 4. re-install. set baro to .02 setting - don't worry about manometer, just set it on the factory settings on baro (be sure it's level and plumb) 5. open fire viewing port (provided burner will start) adjust the flame so that the tips are smokey, then open the air shutter untill all smoke ceases (you can check this w/ a flashlight through the baro.) then open the air just a little more so that the fire gets a little brighter, but not very much smaller. close it up and have a beer
If that's what was wrong with it (burner head) then it probably hasn't been adjusted properly in years. Unfortunately most techs wouldn't know what a proper flame looks like if you showed them and most of the time they won't set the burner up properly w/ bach kit either. Most of the time when they replace a nozzle they simply grab close to the firing rate/spray angle of the one in there and throw it in w/ no regard to the air setting at all. Outside of the occasional bad transformer/motors/controls etc. by far most of the oil burner/boiler issues i've seen are related to: filter/nozzle/end cones/dirty electric eye/electrode position/air settings.