If the temperature on the controller is getting lower during startup, or even reading negative, this can indicate that the thermocouple is wired backward.
- Remove the controller and look at the thermocouple connection.
- On the connection, there will be a "+" and a "-" symbol. Make sure that the thermocouple is inserted correctly. (the + next to the +, see image below).
- If it is inserted correctly and still reading incorrectly, please contact Customer Service.