Our furnace just had the same problem, ours is a pensotti with riello burner, the fan would turn on, and sometimes the burner would ignite other times it would not, so we had to keep hitting the reset button. We had the oil company come out and tune the burner, and it turned out to be the electrodes. the gap between them was too big, so they adjusted them and its been fine ever since.

Help! I'm having trouble with my Honeywell r8184g/forced air Furnace/Wayne oil burner model msr

My controller was replaced in September, ( it wasn't a Honeywell) but now it's having issues. It will sometimes not come on unless I "smack" the controller. Not reset, but smacked. I've had it regularly serviced, but am not so happy with "my guy" right now. not long after it was replaced, the furnace stopped working due to loose wires to the new controller. I fixed that one. could I hvae an electrical problem? should I just replace the controller? Also, the furnace is loud, and I think the "squirrel cage" is a little wobbly( my guy replaced this, too)

You guys sound like you really know your stuff. any advice would be awesome. I'd love to just call a pro, but I have yet to find any in this town, and I'm good at fixing most things.
Thanks!