June 1, 2015

How to replace a treadmill motor controller

By Lyle Weischwill
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.

Quick links
Tools required
Work gloves
Phillips screwdriver
Repair difficulty
Time required
15 minutes or less
Repair difficulty
Time required
15 minutes or less
Replacing a motor controller on a treadmill

This video explains how to replace the motor controller on a treadmill.

Instructions

01.

Shut off the electricity

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

Remove the key.

Remove the key.

02.

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.

Remove the motor hood screws.

Remove the motor hood screws.

Remove the hood.

Remove the hood.

03.

Remove the motor controller

Disconnect the wires.

Remove the mounting screws.

Remove the motor controller.

Disconnect the motor controller wires.

Disconnect the motor controller wires.

Remove the controller mounting screws.

Remove the controller mounting screws.

Remove the motor controller.

Remove the motor controller.

04.

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.

Install the new motor controller.

Install the new motor controller.

Reconnect the motor controller wires.

Reconnect the motor controller wires.

05.

Reinstall the motor hood

Slide the motor hood onto the frame.

Reinstall the motor hood mounting screws.

Reinstall the motor hood.

Reinstall the motor hood.

Reinstall the hood mounting screws.

Reinstall the hood mounting screws.

06.

Restore power

Plug the treadmill into the electrical outlet.

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.
Symptoms for treadmills

Choose a symptom to see related treadmill repairs.

Main causes: damaged walking belt, improper belt tension, lack of belt lubricant, bad drive motor
Main causes: no power, bad power cord, tripped or faulty overload switch, bad power switch, wiring failure, bad motor control board
Main causes: bad control console, wiring failure, bad motor control board
Main causes: rear roller out of alignment, damaged walking belt, bad roller
Main causes: damaged walking belt, improper belt tension, bad roller bearing
Main causes: faulty sensors, wiring failure, bad control console
Main causes: missing safety key, bad control console, wiring failure, faulty motor control board, bad drive motor
Repair guides for treadmills

These step-by-step repair guides will help you safely fix what’s broken on your treadmill.

How to replace a treadmill walking belt

A worn walking belt will begin to slow down during use. If your treadmill walking belt is worn out, replace it using these steps.

Repair difficulty
Time required
 45 minutes or less
June 1, 2015
By Lyle Weischwill
How to replace a treadmill walking board

A worn-out walking board creates friction with the walking belt and causes the belt to slow down during use. Replace the walking board if it's worn or damaged.

Repair difficulty
Time required
 30 minutes or less
June 1, 2015
By Lyle Weischwill
How to replace a treadmill drive motor

A defective drive motor won't run when activated by the motor controller. Replace the treadmill drive motor if it doesn't run.

Repair difficulty
Time required
 15 minutes or less
Articles and videos for treadmills

Use the advice and tips in these articles and videos to get the most out of your treadmill.

December 21, 2016
How to troubleshoot treadmill problems
By Sears PartsDirect staff

See what to check if you're having a problem with your treadmill, and what you can do to fix it.

June 29, 2015
Easy DIY treadmill repairs
By Sears PartsDirect staff

Learn about treadmill repairs that you can easily do yourself.

May 10, 2015
How to maintain a treadmill
By Sears PartsDirect staff

Keep your treadmill in shape by following these tips.