Primary Heat Controller Has Abnormally High Temperature Overshoots

To avoid serious injury follow all warnings and instructions in the manual. Wear appropriate personal protective equipment.

  • Check thermocouple connections and wire for damage. Replace if necessary.
  • Loosen the ferrule nut.
  • Push in the thermocouple wire so that the tip contacts the heater element.
  • Hold the thermocouple tip against the heater element while tightening the ferrule nut 1/4 turn past tight.
  • See Replace Heater Element, in manual.
  • If there is a signal failure from the thermocouple, the thermocouple controller will prevent the heaters from operating.
  • If this occurs, replace the thermocouple. See Replace Thermocouple, in manual.
  • Check for a resistance of 4-6 ohms between purple and red wires on the temperature controller. There should be a reading of infinity between the ground wire and purple wire.