Hardin-F-180 Furnace Thermocouple Replacement

Introduction: Hardin-F-180 Furnace Thermocouple Replacement

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

Never leave unattended.

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    Reply 5 years ago

    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?

    DIY Hacks and How Tos
    DIY Hacks and How Tos

    Reply 5 years ago

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