How do I fix problem life fitness 90t error 1 the motor running faster for 5 seconde then error 1 I replace a new sensore same problem error 1

If you wish to get some details treadmill error codes; check the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/

see the instruc. manual if you do not have go to www.fitness.manualsonline.com or www.iconservice.com

God bless you

1)You must shure the motor has level, use some one.use the washer according with the new motor.
2) Tight very well with wrench.
3) Alignment very well the drive belt, not much tension
4) Lube the deck belt with the instruction manual.
5) Lube the rollers bearing very well.
6) Try to run the software calibration for diagnose, and troubleshooting
God bless you

1)probably a faulty speed sensor 2) the speed sensor is not plugged in properly.3) possibly a faulty motor test for 115 vca without load 4) control board or lower board for measure 115 vca and +5vca 5) Run the calibration sofware for easy diagnotic see the diagram attached.6) Test the transformer for primARY VOLtage and secondary voltage. see the TIP. The error codes will differ between makes and models but could be e1.

http://www.fixya.com/support/r10724803-measure_voltage_in_transforme_fitness

http://www.fixya.com/support/r10786838-test_procedure_dc_motorSincerely. Happy New Year . G-d bless you
ernesto cuadra
managua,nicaragua c.a.

1) replace new ones batteries

2) adjust sensor reed swtich by 1/8" or 3 mms see the diagram

3) tight the flexible cord from keypanel vs display board .
4) tight connector from display board vs lower board(main motor controller board)
5) see block diagram how the main motor controllerh has 90% aprox functions from any treadmills.

hi,
There are two possibilities for this problem
1. Check the speed sensor on near the motor pulley. Remove the sensor and clean it and re-fix it. then make a try. if problem remains then
2. The motor speed controller is faulty. There is an IGBT for controlling the motor speed. If it get shorted the motor will run it its high speed.

Be sure before opening the treadmill remove the power.
ok

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.

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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.