What A FAIL Message Means and How To Fix It!

Types of FAIL Messages

• Steady FAIL Message: Indicates that all thermocouples have failed.
• Flashing FAIL Message: Alternates with TC1, TC2, or TC3, indicating which specific thermocouple has failed.

How to Troubleshoot a FAIL Message

To determine whether the issue lies with the thermocouple or the controller, perform a Thermocouple Bypass Test:

1. Disconnect Power: Turn off the kiln and unplug it.
2. Access the Controller: Unscrew the four screws securing the controller to the control box and pull the controller toward you.
3. Disconnect the Thermocouple: Remove the thermocouple that has failed.
4. Place a Jumper: Insert a jumper (e.g., a paperclip or wire) between the two screws where the thermocouple connects.
5. Power the Kiln: Plug the kiln back in and press ENTER to clear the FAIL message.
   • If the FAIL message doesn’t return, the thermocouple needs to be replaced.
   • If the FAIL message persists, the controller may need to be sent in for repair.

When to Replace Your Thermocouple

Thermocouples are one of the most frequently replaced parts in a kiln. If you encounter a FAIL message, having a spare thermocouple on hand can save you time and frustration. Learn more about the importance of keeping a spare thermocouple in our Spare Thermocouple Guide.