Why do I get TC-- code when I run my 3-button Bartlett

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Cautions

Why do I get TC-- code when I run my 3-button Bartlett

There is a glitch in User 2 program in the 3-button Bartlett. Normally, there is no segment 4 in User 2, but there can be if you program it in, and if there is, and if it is a cooling segment that goes on for more than one hour, the TC-- code will appear and shut down the program.

Normally TC-- means the TC is wired in backwards, so if the kiln has ran fine before and no one just changed or messed with the TC, start checking the User 2 program for a long cooldown in segment 4.

The way to deal with it if it is programming is easy. Make segment 4 just drop a couple degrees, then add another segment as segment 5 to take it from there down the rest of the way.

Additional Actions to Take

  1. Make sure you have programmed the kiln properly and it is supposed to be firing.
  2. Read the Operation instructions.
  3. Do a Program Review as soon as you start firing. (For DynaTrols - see this video)
  1. Carefully examine thermocouple tip. This is the exposed welded joint at the end of the thermocouple that is not covered up by the ceramic tube.
  2. To do this you will have to remove the thermocouple from its protection tube (if it is a kiln that has one of our protection tubes). You can do this with the kiln disconnected from power.
  3. Look for corrosion - especially if it severe. These thermocouple tips will oxidize and otherwise corrode over time. That is normal. There is some point, however, at which the corrosion affects the ability of the tip to work (thermocouples work by generating a small voltage at the tip caused by two different metals reacting to each other).
  4. Corroded thermocouple tip

  5. Make sure the two wires are securely joined. One of the things that can cause an intermittent problem is a bad weld. If the two wires touch each other (even if they are not welded) they may work temporarily. However, if the weld is not secure then the wires could separate when the kiln heats up and cause an intermittent failure.
  6. If the thermocouple tip looks healthy then test the control board.