Even though you know the kiln is not that hot: this indicates a thermocouple failure.
- Check the thermocouple end. Examine the end carefully. Sometimes, a crack can open up while the kiln is hot, but it may not be apparent until the kiln is cold. If the end of the thermocouple appears severely corroded and you are receiving error codes, it is best to replace the thermocouple.
- Check the thermocouple circuit. For instance, verify that all thermocouple lead wires are securely connected. Check where the thermocouple lead wires go into the ends of the thermocouples. Are the cables loose? Tighten the screws on the ends of the thermocouples to be sure you have a tight connection. Check for corrosion. Verify the connections between the thermocouples and the DynaTrol. Try pulling off each connection and reseating it. This can remove corrosion that may have accumulated. Check for melted wires.
- A straightforward check is to measure resistance in ohms. Remove the thermocouple lead wires from the thermocouple head and check the resistance with your meter. If the thermocouples and circuit are standard, then you will see a resistance of about 0.9 or 1.0. If you see an OL (open loop) in your meter, then you have an open circuit somewhere, which is likely due to a faulty thermocouple.
