Proform 620XP -- when stepping on belt, belt stops! I step off, belt starts turning.

check adjust belt tension
may have to clean under belt area as there could be a build up that is stopping the free movement of the belt as it gets hot

1) You must RUN the software calibration for diagnose, and troubleshooting, and fix it Inmediately.

God bless you

To calibrate the speed follow these steps.
Press stop and speed up and place the safety key in its spot.
release the stop and speed up.
Press stop again. The windows on the console (speed & time) will be all zeros.
Press speed up, the time window will increase. The belt should start to move. Increase this number to 85. This is maximum speed. Adjust the potentiometer to the correct maximum speed. The console will beep until the correct speed is adjusted (+ or - .2mph).
If the machine suddenly goes dead when in use, you may have a static electricity problem.
Check that the ground pin is present on the plug and check your outlet for a proper ground connection.

hi there
it could be 2 things of this problem
1 walking belt slips easy ti fix
1th step; put treadmill in speed of 4 mph and step on side and try with one leg to stop it (be carefull) if you see walking belt stops with align key give more tension from the back of treadmill rear rollers by turning both bolts clockwise same degree with small turns till stops

if it does not help it is probably drive belt

you need give more tension on motor by using 9/16 wrenches

try ajusting the rear roller, that puts tension, On the belt drive

Look under PROFORM J8 (29798)

At the end of of the running belts in the end caps will adjusting bolts you will need a allen wrench to adjust the tension. Start your treadmill and turn clockwise a 1/4 turn each time see i f you can stop the belt. You need to be aware that the drive belt can also cause this problem so I suggest that you remove the motor shroud and when you are adjusting whether the front roller is moving and the running belt has stopped or the roller has stopped and motor is rotating ( adjust Drive Belt)

look for a tension knob it will tighten the belt unless the belt is really wore out and may need replaced

your belt is probably loose. does it slip or skip when you step on it? Turn it over it has adjustments on the underside or somewhere close.

Check both belts to be sure they are adjusted and not slipping.Check the underside of the walk belt to see if it feels frayed in the center as compared to the edges, the center always wears more than the edges a really worn belt must be replaced. if it is nor worn there is a wax lubricant for proform treadmills that can be purchased at retail stores that sell treadmills.Sears, dicks sporting goods and also treadmilldoctor.com are good places to buy it.