Replacing the High Limit Thermocouple

Replacing

To avoid electrical shock or property damage, move the power switch to OFF and disconnect power.

1. Remove electrical power supplied to the unit.

2. Lower the control board.

   

3. Mark and disconnect the wires from the high limit control located behind the control board mounted to the frame.

   

4. Using a 1/2 inch wrench, loosen the compression fitting on the probe.

5. Slide the fitting nut and the ferrule back to loosen the probe.

6. Remove the vat bushing from the vat. Replace with the new bushing included with new part. Apply thread sealant and tighten into vat.

7. Apply thread sealant to the compression fitting. Thread into the vat bushing.

8. Insert the probe into the compression nut and the ferrule.

   

9. Insert the new probe into the compression fitting. Be sure to insert the probe end into the sleeve welded to the burner tube inside of the vat.

10. Tighten the compression fitting nut.

For additional troubleshooting refer to the JWF Light Code Chart.