I have an older Slant Fin Liberty oil furnace that safeties out sometime around 4 hours. It seems to be intermittent because I have seen it do more than one cycle. The recent history on it is about a month ago I changed the electrodes, nozzle and filter. It was running fine until a couple of days ago. I noticed pressing the reset caused it to kick right back on and appear to run normally for several hours. What should I look for to troubleshoot this? We did get oil delivered. Maybe something with the fuel?
I noticed this morning when I reset it, it fired then quit. I could hear the electrodes zapping. I had to reset it an addtional time after it quit. I'll pull the filter and check the flow later this morning.
Added a video to demonstrate what I am dealing with. Please watch.