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Won’t fire unless capacitor housing is unlatched
Hey everyone! First post on this forum! Now that I have multiple properties and about 9 different heat sources amongst them I figure this forum may be a great place to join! So my first problem although not really a problem because this furnace isn’t exactly necessary but I’d love to have it as a backup! So I have this fairly old oil heater in the basement of my 1850 duplex. It had this ancient burner in it that weights damn near a ton! I replaced it with a burner from an oil fired hot water heater that was down there and not being used. I matched everything up swapped the nozzles and checked the pressure and everything else so it should be a modern version ready to go! However I couldn’t get it to fire! Eventually I put the other nozzle in which is .1 gph higher and 10 degrees less then the one it’s supposed to use and it fires right up and purrs like a kitten and I shut it off so I don’t overheat it due to the wrong nozzle being in there. I put a new .50 gph 90 degree hollow nozzle in to replace the old nozzle and still nothing. Adjust the air to no avail but when I unlatch the spark box on the top and bounce it up and down briefly it fires right up and if I leave it unlatched it runs fine and cycles and works great. If I close this latch and add air it won’t start. I would imagine having it unlatched adds air but if I open the air supply no matter how much it won’t fire unless the spark box is unlatched. I’m a bit baffled. If I push the box down to sit flush the flame immediately goes out. Any oil burner folks have any idea what I’m missing?