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I have an Armstrong Air Ultra 80 oil furnace that is locking out every so often. If I push the red button to reset from lockout it will run for a day, two, three or whatever then eventually locks out again and I have to push the reset button. Once I push the reset button it fires right up. It only seems to do this when the heat runs in the winter. In the summer with the AC running I never have this problem.
I pulled the filter today and it was dirty but I could have sworn I changed it not too long ago. I guess only time will tell if the filter was the issue but I would be surprised if it was because I regularly change them. I had someone out a year or so ago when this started happening but they couldn't find anything wrong with it. But now the problem is becoming more and more prevalent.
Is there something I can check or look for to figure out what is causing this?