There are few things more frustrating than gearing up for a run, pressing 'Start', and being greeted by a loud beep and a flashing code on the console. If you own a Horizon Fitness treadmill, the E1 and E2 error codes are the most common gremlins you will encounter.
Fortunately, these codes are usually specific to the speed system. An E1 code typically indicates a loss of speed feedback (the console doesn't know the belt is moving), while an E2 code often signifies an overspeed or underspeed issue (the motor is struggling to maintain the correct pace). Before you call a technician, here is a step-by-step guide to diagnosing and fixing these issues yourself.
Step 1: The Lube Check (Fixes E2)
The most common cause of an E2 error—and sometimes E1—is actually friction. If your running belt is dry, the motor has to work double-time to pull your weight. This draws excessive amperage, causing the motor control board to trip a safety error to prevent overheating.
The Fix:
- Slide your hand under the belt. It should feel oily.
- If it is dry, apply 100% silicone treadmill lubricant.
- Walk on the machine at a slow speed to disperse the lube.
- Restart the machine and see if the error persists.
Step 2: The Speed Sensor (Fixes E1)
If your treadmill starts, the belt moves for about 3-10 seconds, and then shuts down with an E1 error, the culprit is almost always the Reed Switch (Speed Sensor).
Your treadmill has a magnet on the front roller pulley and a sensor nearby that counts revolutions. If the console sends power to the motor but doesn't receive a 'count' back from the sensor, it assumes the belt is broken and triggers an emergency stop.
The Fix:
- Unplug the treadmill and remove the motor hood cover.
- Locate the front roller pulley (usually on the right side). Look for a small magnet glued to the wheel.
- Locate the speed sensor (a small black stick) mounted near that wheel.
- Align them: The sensor should be within 1/8th of an inch of the magnet but not touching it. If it has been bumped out of place, bend the bracket gently back so the sensor tip points directly at the magnet path.
Step 3: Check Wiring and Reset
Sometimes vibrations loosen the connection between the speed sensor and the control board.
- Follow the wire from the speed sensor to the circuit board.
- Unplug it and plug it back in firmly.
- Perform a Reset: Turn off the power switch, unplug the machine, wait 60 seconds, and plug it back in. Some models allow a 'Master Reset' by holding the 'Stop' and 'Enter' (or Speed Up) buttons simultaneously while inserting the safety key.
Is the Motor Control Board Dead?
If you have lubricated the belt and aligned the sensor, but the error persists, you may be facing a failed Motor Control Board (MCB). Replacing an MCB can cost between $300 and $500.
If your Horizon treadmill is an older entry-level model (like the T101) and is out of warranty, the repair cost might approach the value of a brand-new machine. If you decide to cut your losses, here are the direct replacements from Horizon's current lineup that feature upgraded motors and better self-cooling systems.
The Direct Replacement: Horizon T101
If you loved the simplicity of your old unit and just want to get back to walking and light jogging without breaking the bank, the T101 is the modern version of Horizon's best-seller.
The Performance Upgrade: Horizon 7.0 AT
If your E1/E2 error was caused by burning out the motor due to heavy use (longer runs or interval training), do not buy another entry-level treadmill. Upgrade to the 7.0 AT. It has a RapidSync motor designed specifically to handle faster speed changes and heavier loads, making it much less likely to throw E2 friction errors.
The Serious Runner's Choice: Horizon 7.4 AT
For households with multiple users or those running 20+ miles a week, the 7.4 AT offers a larger deck and a 3.5 CHP motor. The larger motor provides more torque at lower RPMs, which significantly reduces strain on the control board and minimizes the risk of electronic failures.
