SOURCE: 9100 life fitness treadmill
Sounds like you need a new lower board replacement. You can get that for that treadmill by call lifefitness or sportsmith.com Please rate me good
I’m happy to help further over the phone at https://www.6ya.com/expert/howard_079189dd4959a511
SOURCE: error 1 message on older life fitness t3 treadmill
Error 1 - Start up error. This is caused because the belt was commanded to move and the opto (speed sensor on the motor) has not seen any movement or the belts movement was interrupted prior to it reaching its commanded speed. To fix Verify opto operation in Diagnostics, Motor Test
Mode, Section 2. Verify DC voltage at connector P6 pins 1 and 2. Verify that LED 4 on the Motor Controller flashes as the motor moves. Let me know if you need any more help. Fitness Fix-It
SOURCE: Fet error message
The FET error message is caused by the driver transistor on the motor controller has shorted out. Unfortunately, the fix is replacing the motor controller.
SOURCE: life fitness treadmill display: transistor error-won't run
This error shows up if motor controller detects a failed part. This isn’t a reset-able error. Treadmill will not allow workouts until serviced.
Solution
Main motor wires/leads could be disconnected at the start of a workout. If the motor is properly connected and in working condition then the drive transistor could have failed. Check Motor Controller.
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