How to Replace a Treadmill Motor Controller



This DIY repair guide explains how to replace the motor controller on a treadmill. The motor controller runs the motor at the speed you select at the console. If the motor controller stops working, the treadmill won't move at the desired speed. Replace the motor controller with the manufacturer-approved replacement part.

This procedure works for common ProForm, Weslo, Weider, Lifestyler, NordicTrack, Sole and Horizon treadmills.

Repair difficulty:
Time required:

Less than 15 min.

Parts Required:

  • Motor controller

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

Tools Required:

  • Work gloves
  • Phillips screwdriver

Before you begin

Wear work gloves to protect your hands.


 Warning: Undertaking repairs or maintenance to appliances or power equipment can be hazardous. Should you choose to undertake repairs or maintenance, you are assuming the risk of injury to your person or property. In an effort to reduce the risk, use the proper tools and safety equipment noted in the applicable 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 or maintenance, however, should only be performed by a qualified technician.

Step 1: Shut off the electricity

Remove the key and unplug the treadmill’s power cord from the wall outlet.

Step 2: Remove the motor hood

Remove the screws securing the motor hood to the belly pan.


Pull the motor hood forward and remove it from the treadmill frame.

Step 3: Remove the motor controller

Disconnect the wires.


Remove the mounting screws.


Remove the motor controller.

Step 4: Install the new motor controller

Position the new motor controller on the frame.


Reinstall the motor controller mounting screws.


Reconnect the wires to the new motor controller.

Step 5: Reinstall the motor hood

Slide the motor hood onto the frame.


Reinstall the motor hood mounting screws.

Step 6: Restore power

Plug the treadmill into the electrical outlet.