Can i replace a speed sensor on a threadmill - Precor C956i Treadmills with HR / WholeSale

There would be some problem in wiring harness between motor control board and control panel. Try to remove form both side an reconnect it
If you wish to get some details; check the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/

https://www.treadmilldoctor.com/troubleshooting.html

Make sure the battery is not in backwards.

1) adjust the speed sensor, clean it, and tight wires connector very well.
2)test the input voltage motor, if there are voltage, the motor need repair or replace.
3) measure the output voltage board, for input voltage motor, if there are NOT the board is faulty.
see the diagrams.
God bless you

Dear Sir:
Inspect the bottom of your treadmill console.

Use the pencil point. touch the hole(nano swithc) and ready. Of course you must disconnect the power before. After you reconnect it. And ready.

sincerely. God bless you.

ernesto cuadra
managua, nicaragua. c.a.

i just had a noise in my York T301 that sounds exactly the same as yours. It also came up with a E1 error code and stopped working. I pulled the motor hood off and noticed that the magnet in the drive pully had come dislodged. It was hitting the speed sensor near the belt. Glued magnet back in and all better. Hope this helps.

You will need to check the speed sensor for proper alignment and function. it should be located near the front roller or mounted on the motor. It should be within a credit cards width of the magnet or toothed wheel. If properly adjusted check with an ammeter to see if it is opening and closing by manually spinning the front roller or motor flywheel. If it isn't replace the sensor. If it is functioning make sure you are getting 5vdc to it across the wires. If you are not replace the upper control board(console). If you are getting the proper voltage then replace the lower control board(motor controller).

You will need to check the speed sensor for proper alignment and function. it should be located near the front roller or mounted on the motor. It should be within a credit cards width of the magnet or toothed wheel. If properly adjusted check with an ammeter to see if it is opening and closing by manually spinning the front roller or motor flywheel. If it isn't replace the sensor. If it is functioning make sure you are getting 5vdc to it across the wires. If you are not replace the upper control board(console). If you are getting the proper voltage then replace the lower control board(motor controller).

it seems a speed sensor feedback problem
if competent remove power supply to threadmill ,open covers and locate speed sensor on motor drive unit ,blow dry air using a suitable air compressor or just use a brush to gentle remove any deposits
close covers and retry