We just bought a use Proform xp 615 trainer. It won't start. When we turn the red button to reset or off it flashes and then goes off. It didn't come with a manuel.

SOURCE: unfolding the deck on treadmill

From the owners manual:

HOW TO LOWER THE TREADMILL FOR USE

1. Hold the upper end of the treadmill with your right hand.
Pull the latch knob to the left and hold it. It may be necessary
to push the frame forward as you pull the knob to
the left. Pivot the frame downward and release the latch
knob.

2. Hold the metal frame firmly with both hands and lower
it to the floor. CAUTION: Do not grip only the plastic
foot rails or drop the frame to the floor. Bend your legs
and keep your back straight.

SOURCE: total blackout...neither motor or display

IS THE SAFTY CARD INSTALLED ? MOST TREDMILLS HAVE A SAFTY LOCK OR CARD THAT HAS TO BE IN OR READING FOR THE SYSTEM TO START

SOURCE: I have the proform 7.0 personal fitness trainer

Try to calibrate the incline threough the calibration mode.

SOURCE: how to remove and replace a motor belt on proform

Hello there. To replace the drive belt (motor belt) follow this procedure.
1)Remove power to the machine
2)remove the hood cover (3 screws on the rear of the cover)
3) loosen the adjusting bolts for the walk belt located on the opposite end of the walk belt from the hood assembly. Loosen the adjusting bolts 10 full revolutions. This will loosen the walk belt.
4) You should then walk the drive belt off of the front roller/pulley assembly by pushing the belt to one side while turning the motor. If you are nable to do this you will need to loosen the 2 bolts holding the drive motor in place.
5) After removing the drive belt you can then slide the drive roller to the side out of the frame and it will slide out the other side of the bracket. This will allow the belt to be removed from the front roller and be replaced.
If you had to loosen the bolts holding the motor you will need to retension the drive belt by pulling the drive motor back while tightening the bolts. This will require another person to help tension while you tighten the bolts.
You can then retension the walk belt using the adjusting bolts and retightening them 10 revolutions.
Good Luck Tim

SOURCE: I have a Proform 350S Cross Trainer Treadmill

http://www.iconservice.com/CustomerService/manuals.do
Input your model number and get a free download.
Good Luck. Tim