How can the thermocouple wires get reversed on a Jupiter or DaVinci Automatic Kiln?

When packed, the thermocouples on the Jupiter JD and DaVinci kilns are mounted to the kiln sections without the thermocouple lead wire attached. This is because the panel is packed separately.

During assembly the customer must connect the thermocouple lead wire to the thermocouple. It is easily possible for the customer to connect the wires up backwards. It is also possible that the wires were connected to the DynaTrol backwards. The terminals on the back of the DynaTrol are clearly marked RED as is the negative wire in the thermocouple lead wire. However, we do test every kiln with a thermocouple test which makes this second possibility unlikely - but not impossible.

See this link about E-22 and E-6 error codes.