I purchased an older used TnF-24 Paragon kiln recently and added a new AutoFire -3000 controller to it. I test fired a bisque load at cone 04 last week and didn’t have any problems.
Yesterday I fired a glaze load to cone 6 and I was getting a firing too slow warning (FTH) out of the controller. It finally stopped at 2161 F degrees with a firing took too long warning (FTL). I sure hope that my glaze firing is not ruined.
The elements looked to be in good condition but obviously something is wrong with the kiln.
Where should I start to diagnose this problem?