Treadmill: Console powers up but the treadmill won't start

A missing safety key, failed console display, wiring failure, faulty motor control board or bad drive motor will prevent the treadmill from starting even though the console display powers up.

Insert the safety key properly when starting the treadmill. If the treadmill won't start with the safety key inserted, unplug the treadmill and check the wire harness connections between the console display and the motor control board. Reconnect any loose wires and repair any broken wires.

If the wiring between the console display and the motor control board is okay, then you may need to replace the console display if it's not detecting the safety key. A technician will typically need to conduct live voltage checks to determine whether the console detects the safety key.

If the console display detects the safety key but the motor control board isn't activating the drive motor to start the treadmill, then you'll need to replace the motor control board. A service technician will typically need to check voltage going to the drive motor to determine whether the motor control board is working.

If the motor control board activates the drive motor but the drive motor doesn't run, then you'll need to replace the drive motor. If you hear the drive motor buzz but it doesn't run, replace the drive motor.

treadmill

These repairs may help solve your treadmill problem

Replace the treadmill console display

Replace the treadmill console display

The console displays the elapsed time, distance traveled, estimated calories burned, current speed, and the user's pulse. If the console doesn't work, replace the console display assembly.

Replace the treadmill motor

Replace the treadmill motor

The motor spins the front belt roller to rotate the walking belt. If the motor is weak or defective, replace the motor.

June 1, 2015
By Lyle Weischwill
How to replace a treadmill drive motor

If the treadmill won't start, the problem could be a worn motor. This repair guide and video show how to replace a treadmill drive motor in 6 quick steps.

Repair difficulty
Time required
 15 minutes or less
Read more
Replace the treadmill motor control board

Replace the treadmill motor control board

The electronic motor control board controls and monitors the speed. If the motor controller is defective, replace the motor controller.

June 1, 2015
By Lyle Weischwill
How to replace a treadmill motor controller

If your treadmill won't run at the speed you set, the motor controller could be to blame. This repair guide and video show how to replace a treadmill motor controller in just 15 minutes.

Repair difficulty
Time required
 15 minutes or less
Read more
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.