FET Error I have a Life Fitness T3 treadmill. When I turn it on the display say FET Error.

How do I fix error 6 on my treadmill?

E6 Error: Controller malfunction. Resolution: Ensure that the cables connecting the console and the controller are secure. If any of the cables/connectors appear loose, completely power off and unplug the treadmill before unplugging and reattaching the cables.Sep 23, 2021

E6 Error Code: Control Board Malfunction - Spirit Fitness Support

https://www.google.com/search?q=LIFE+FITNESS+T3+ERROR

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Hi,
error 3 means the waking belt starts moving without any command. Make sure that you are not moving the belt manually before the treadmill stars .
for more details check the link
electronics repair help LIFE FITNESS T3 T3i T5 T5i T7i TREADMILL ERROR...

This is most likely caused by a worn treadbelt. Try lubing the belt Have unit looked at by a qualified tech #wilitalube

Treadmill Repair 877 805 1030 Wilita 100 silicone treadmill belt lubricant...

Fet error is caused by the drive component(s) on the motor control board going open circuit or faulty. This is caused by poor power supply or excessive friction on the running belt which in both cases leads to excessive heat build up in the control electronics.
The Motor controller will need to be repaired or replaced and the heat issue resolved.

Can you please provide model of unit.

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

FET Stuck on Error / Err 5 - This error is probably caused by the driver transistor on the motor controller is detected to be shorted out. The fix is replacing the motor controller.

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.

The cause of a “STUCK KEY” error message on the Basic or Advanced consoles. A stuck key error is displayed when one or more keys on the console or activity zone remain actuated for more than 45 seconds.
SOLUTION
Recycle the power. If the key remains stuck, the console will display “PLEASE WAIT” until the stuck key error is displayed again. Determine the stuck key. Replace the console if the problem is a key on the console. Replace the activity zone membrane keypad or the activity zone circuit board depending on the product if the problem is not in the console.

startup error on life fitness treadmill