Spent 4 hours chasing a burn-in that was just a bad thermocouple wire
I was dialing in a new furnace lining last Tuesday and kept getting wild temp swings on the control panel. After checking the burner settings, the gas pressure, and even the lining itself (waste of a morning), I finally swapped the thermocouple wire and bam, steady readings in 15 minutes. The crimp connector had a tiny bit of corrosion inside, which I only caught because I wiggled it by accident. Has anyone else had a simple connection issue that ate up a whole shift before you figured it out?