[Bob Mariani]

What is the most likely control causing an oil burner's reset to trip. Already had boiler cleaned. Filters are new, old was clean. New nozzle installed. So I think fuel is not the problem. But I can have a good flame and suddenly it just trips and goes off. Will not stay running without occasionally tripping. Boiler service man was here twice and cannot find the problem.

 

[yuri]

Cad cell (fire eye) not seeing the flame properly, dirty or weak cell, improperly positioned cell are a couple possibilities.