Whether used for running or walking, treadmills are a convenient way to receive a good workout in the home. Treadmills require maintenance, or damage to the motor, belt or speed controls may occur. When one of these components fails, troubleshooting the treadmill helps determine the point of failure and gives you the opportunity to replace the part without contacting a repair technician.
Step 1
Plug in the treadmill and set the speed at 2.5 mph. Walk on the treadmill to detect any changes in the speed controls. If the speed slows down or speeds up unexpectedly, the problem may be with the speed control. Speed changes are also caused by belt failure. To eliminate that the belt is the cause, step off the treadmill and let the motor continue to move the belt. If the speed still changes, the problem is with the speed controls.
Step 2
Troubleshoot the belt for any friction setback. Treadmill belts need lubrication to limit the amount of friction between the belt and the platform on the treadmill. Treadmills are built with sensors, so when friction increases and heats the belt, the machine is set to power off. This causes the treadmill to suddenly stop running. If you have not lubricated the treadmill, lubricate the belt and try using the treadmill again. If the treadmill continues to shut down, the belt may need to be replaced.
Step 3
Run the treadmill while listening to the motor to detect any strange sounds. A burning smell or unusual noises coming from the motor may indicate a mechanical problem. You can replace the motor or contact a repairman to replace it.
Step 4
Center the belt and lubricate it to troubleshoot any burning smell or friction from the belt loosening. If the belt slides off-center, it will rub against the sides of the machine, causing it to fray and tear. If it frays or tears, you need to replace the belt. Before it's damaged, center the belt and adjust the tension.
Step 5
Replace the motor if the treadmill is powered on at full speed, and it can't be adjusted. Treadmills that power on at high power often have failed circuits. These conditions can happen erratically, causing a safety issue. Replace the motor or have a professional replace the circuit.
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