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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;
COOL ;
2nd-800 C;
COOL;
3rd-1150 C

Never leave unattended.

<p>That is some very useful information. Thanks for sharing. </p>
<p>Noticed this post after I googled hardin furnace while I was searching for a manual to the installed PID. Have come up empty on a manual of any sort. Since you built this was wondering if you had some info on modifying of changing the settings of the factory installed PID controller for this furnace?</p>
<p>To leave a comment for the author, Use the text box right below the steps.</p>

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