Plugged or bad nozzle, bad ignition transformer, bad primary, dirty or bad cell. Weak oil pump. Just a couple quick possibilities.
no disrespect..but servicing an oil furnace is not for the diy....have it cleaned and serviced by a pro.....sorry...agree with hvac dude don't keep pressing reset could be very dangerous..ben srMy inter therm furnace keeps shutting off in my trailer. It's 28 degrees outside and 67 inside. The outdoor tank is full. I opened the front panel and pushing the reset button. Turns on them about 5 seconds turns off. What could be wrong and what can I do?