My treadmill will not start how do you know if its the motor

Is anything jamming the belt or motor drive pulley? Look carefully for anything that could be jamming it. If you suspect the motor could be bad, take it electrically out of the circuit and connect it directly to the your power supply, if it spins up you know its working, however, it could still be tripping off when under load.

Unless you know how to use a multimeter I suggest calling a treadmill repairer . Home Treadmill Repairs Brisbane Brisbane Leading Treadmill and Fitness...

Check the motor belt, more than likely has a burnt spot in it and can cause a knocking

The board will most probably need replacing. Almost certain.
I repair this brand for the manufacturer.

please see the video and lube+rollers bearing front and back, test the drive belt motor, and replace the belt if necessary.
However if the problem persist, your control board is faulty.see the block diagram

motor brushes are bad that is why motor can not start itself

hi, best way to find out is to take off the front cover showing the motor, then without standing on the treadmill start, most likley its the belt on the motor that has either slipped off or just needs to be tightened, you will know this when the belt on the motor isnt moving but the motor is.

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

Better know someone who can fix it, like who you got the Treadmill from. Maybe they can help you, it's better if you had the warranty. Or you can trade yours in for another one. That always helps.