How I figured out how to replace the thermocouple on a Hardin 180 furnace.
Step 1: Removal of Mesh Gaurd
Remove the 6 screws with washers holding mesh Heat guard in place. Ceramic cones may or may not stay in place.
Step 2: Lid Assembly
Remove 4 screws on back holding lid assembly to furnace body. Set aside.
Step 3: Access Plate
Turn oven assembly upside down and remove the 4 screws holding it in place
Step 4: Removal of Thermal Couple
Remove the 2 screws holding coupler to body.
Step 5: Temperature Control Panel
Loosen screws from back of control panel where thermocouple is connected to. ( keep in mind the proper placement colors of the wires)
Step 6: Swapping Out Coupler
Pull old out and place in new.
Step 7: Reattach Thermocouple
Reattach thermocouple to body and reattach wires to back of control panel. Zip tie loose wire to the rest of the wires.
Step 8: Reattach the Rest
Reattach access panel, lid assembly, and mesh guard. In that order.
Step 9: Test
Turn on. Run in 3 wave.
1st- 400 C;
Never leave unattended.