Seeing an error code flash on your treadmill console is the quickest way to ruin a workout. On Star Trac treadmills, E1 and E2 are the most frequently reported faults. These codes specifically relate to the communication between the motor, the speed sensor, and the lower control board.
While Star Trac machines are built like tanks for commercial use, their sensors and electronics are sensitive to wear and dust. Here is a breakdown of what these codes mean and how to fix them.
What Do the Codes Mean?
- E1 (Stall / Loss of Speed Feedback): The computer has commanded the motor to move, but it is not receiving a signal back from the speed sensor indicating that the belt is actually moving. The system shuts down to prevent damage.
- E2 (Overspeed): The opposite of E1. The computer detects that the belt is moving significantly faster than the speed you requested. This triggers a safety stop to prevent a "runaway" treadmill.
How to Fix the E1 Error (No Speed)
The E1 error usually happens immediately after pressing Start. The timer may count down, you might hear a relay click, but the belt either doesn't move or moves slightly and then stops.
1. The "Kick" Test (DC Motor Models) If you are on an older home unit with a DC motor, stand on the side rails, press Start, and give the belt a hard push with your foot to help it get going. If it starts running after your assist, your motor brushes are likely worn out and need replacing.
2. Clean the RPM Sensor Most Star Trac units use an optical RPM sensor near the motor flywheel. Over time, brake dust and lint can block the "eye" of the sensor.
- Unplug the machine and remove the motor hood.
- Locate the plastic disc with slots on the motor shaft (or the flywheel).
- Use a Q-tip and compressed air to carefully clean the sensor that reads this disc.
3. Check the Sensor Wiring Trace the wire from the speed sensor to the lower Motor Control Board (MCB). Ensure it hasn't been vibrated loose. Unplug it and plug it back in to ensure a solid connection.
How to Fix the E2 Error (Overspeed)
An E2 error is often more startling because the treadmill may surge in speed before shutting down.
1. Perform a Speed Calibration Sometimes the software simply loses track of the motor's voltage limits. Consult your owner's manual for the "Maintenance Mode" or "Calibration" sequence (often holding specific keys while powering on). Running the auto-calibration can reset the speed parameters.
2. Check the Motor Control Board (MCB) If your treadmill accelerates to full speed immediately upon starting (before throwing the E2 code), the Motor Control Board is likely damaged. Specifically, the MOSFET component that regulates voltage has likely "shorted open," allowing full power to the motor constantly. In this case, the lower board must be replaced or sent to a specialist for rebuilding.
Is It Time to Upgrade?
If you are facing a failed Motor Control Board or a burnt-out motor on a Star Trac unit that is over 10 years old, the repair bill can easily exceed $600–$800. At that price point, it is often wiser to invest in a new machine with a fresh warranty.
If you want to stick with the commercial-grade durability of Star Trac, here are their current top models for home and light-commercial use.
For those who demand the absolute best, the 8-Series is the exact unit found in high-end health clubs worldwide. It features a stronger AC motor that is virtually immune to the brush-wear issues that cause E1 errors in cheaper DC motors.