Treadmill won't turn on or keeps shutting off: what to check first

A treadmill that will not turn on is one of the most common calls we get. Sometimes it is a two-minute fix you can do yourself. Sometimes it is a part that has failed. This guide walks through the safe checks first, in order, and then explains what a technician looks at when those do not work.

Safety first: unplug the treadmill before you touch anything near the motor cover, and never open the motor compartment while it is plugged in. Treadmills run on household current and the control board can hold a charge.

1. The safety key

Many "dead" treadmills are not dead. The safety key (the clip on a cord that attaches to your shirt) has to be fully seated in its slot, or the machine will not start, and on many models the console stays dark. Pull it out and push it back in firmly. If the key is lost or cracked, a replacement key is inexpensive and usually solves it.

2. Power at the wall

Plug a lamp or phone charger into the same outlet to make sure it has power. If the treadmill is plugged into a power strip or extension cord, plug it straight into the wall instead. Treadmill motors pull a lot of current on start-up, and power strips and light extension cords are a common reason a treadmill starts and then cuts out.

3. The breaker, and the treadmill's own reset switch

Check your home or building circuit breaker. Then look near the power cord on the treadmill itself: many models have their own small breaker or reset button. If it has tripped, reset it once. If it trips again right away, stop. A breaker that keeps tripping is telling you something is drawing too much current, often a worn belt and deck or a failing motor, and resetting it over and over can damage the electronics.

4. The power switch and cord

Make sure the main power switch (usually at the front, near the cord) is on. Look along the cord for kinks, cuts, or a scorched plug. A damaged cord should be replaced, not taped.

If it turns on but won't run

If the console lights up but the belt does not move, or it starts and then stops after a few seconds, the problem is usually past the simple checks. Common causes:

• A worn belt and deck. Friction makes the motor work too hard, so the control board shuts it down to protect itself. This often shows up as the belt stopping when someone steps on it. See our belt slipping guide.
• A failing drive motor. Brushes wear out, and motors can overheat.
• A control board fault. The board sends power to the motor. When it fails, the console may work while the belt does nothing.
• A speed sensor problem. If the board cannot read the belt speed, many treadmills stop and show an error code. Our error code guide covers the common ones.

If it shuts off in the middle of a workout

A treadmill that runs for a while and then cuts out is usually overheating or overloading. The usual suspects are the same: belt and deck friction, motor wear, or a board protecting itself. Note when it happens (after how many minutes, at what speed, with how heavy a user), because that helps a technician narrow it down quickly.

What a technician checks

A technician tests the incoming power, the safety circuit, the control board's output, the motor, and the speed sensor, and checks belt and deck wear, which is the root cause more often than people expect. Replacing a control board without fixing a worn deck, for example, often means the new board fails too. We diagnose first and quote the repair before any repair work is done.

Under 3 years old? Check your manufacturer's warranty before you book a repair. Only the manufacturer can approve a warranty claim, and covered repairs usually have to go through them.

When to call ServiceRX

If the checks above do not fix it, request service or call 888-383-6371. Tell us the brand, model, and what the machine is doing; a photo of the model sticker and a short video of the problem help a lot. We serve parts of North Carolina and South Carolina; see our service area. Not sure what a visit costs? Read how a repair visit works.