How to Replace the Thermal Switch in a Wall Oven

 

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This DIY repair guide gives step-by-step instructions on how to replace the thermal switch in a wall oven. The thermal switch trips to protect the oven from excessive heating. If the thermal switch trips, the oven won't heat until you reset the switch by pressing the red button on the switch body. Replace the thermal switch with a manufacturer-approved replacement part if the oven won't heat after you reset the switch.

The self cleaning cycle sometimes causes the thermal switch to trip; if it trips when the oven isn't self-cleaning, investigate what caused the oven to overheat before using the oven again.

Repair difficulty:
     
Time required:

Less than 60 min.

Parts Required

  • Oven thermal switch

For manuals, repair guides, and specific part recommendations, enter your model number.

Tools Required

  • 1/4" Nut driver
  • Phillips screwdriver
  • Work gloves

Before you begin

Wait until the oven cools. Wear work gloves to protect your hands. Find someone to help you lift the wall oven. 

Instructions

 Warning: Undertaking repairs to appliances can be hazardous. Use the proper tools and safety equipment noted in the guide and follow all instructions. Do not proceed until you are confident that you understand all of the steps and are capable of completing the repair. Some repairs should only be performed by a qualified technician.

Step 1: Disconnect electrical power

Shut off the house circuit breakers for the wall oven to completely disconnect electrical power.

Step 2: Remove the wall oven from the cabinet

Set a sturdy work table or platform just in front of the oven and pad the surface of the table with a towel or cardboard to protect the table. 

Open the oven door and remove the mounting screws that secure the oven to the sides of the oven cabinet. Slide the oven forward in the cabinet. You should have enough slack in the electrical conduit of the power supply; if not disconnect the power supply wiring from the junction box for the wall oven.

With someone's help, carefully lift the oven out of the cabinet and set it on the table in front of the cabinet. 

 Tip: Use the installation manual for your wall oven to guide you in this step.

Step 3: Remove the outer back panel

Starting with the bottom screws, remove the mounting screws that secure the outer back panel to the oven frame. Press on the outer panel as you remove the last of the top screws to prevent  the outer panel from falling.

Remove the outer back panel and set it aside.

Step 4: Remove the thermal switch

Disconnect the wires from the thermal switch.

Remove the mounting screws from the thermal switch. Remove the existing thermal switch and set it aside for disposal. 

Step 5: Install the new thermal switch

Position the new thermal switch on the back of the oven and line up the mounting screw holes. Insert the mounting screws and tighten them firmly.

Position the wires on the ends of the thermal switch terminals and push them onto the terminals. Push the female spade connectors all of the way down so that they seat properly.

Step 6: Reattach the back panel

Position the outer back panel on the oven so that the mounting screw holes line up. Starting at the top of the panel, insert the mounting screws and tighten them firmly.

Step 7: Reinstall the oven

With someone's help, lift the oven into the cabinet. Reinstall the mounting screws on the sides of the oven cabinet that hold the oven in place.

Step 8: Turn on power to the oven

Reset the house circuit breakers for the oven to restore electrical power.