Proform XP unlock knob fell off. The bolt is stuck inside the collar. How can I get it to release?

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Be sure the outside knob is unlocked before closing the door.
Schlage locks do not lock the inside knob or lever. After releasing the turn button, also turn the inside lever or knob, then check the outside knob.
What model of lock is this?

please go to www.fitnessrepairparts.com and get the parts

Happy new year. God bless you

well if you havent been able to get the cat out by now its dead but looking at the pics only way you can get in is by jigsawing the latch out

There should be a washer that fits over the balance wheel, if you dont put that back on the machine wont work.
Check around and see if it fell off when you removed the knob, or check to see if it is stuck inside the knob.

The washer is about 1" in diameter with a couple little tabs on it.
It will only work when installed correctly so if at first you fail just turn the ****** over!

Before folding the treadmill, adjust the incline to the lowest position. If you do not do this, you may damage the treadmill when you fold it. Remove the key and unplug the power cord. CAUTION: You must be able to safely lift 45 lbs. (20 kg) to raise, lower, or move the treadmill.
Hold the metal frame firmly in the location shown by the arrow at the right. CAUTION: To decrease the possibility of injury, do not lift the frame by the plastic foot rails. Make sure to bend your legs and keep your back straight as you raise the frame. Raise the frame about halfway to the vertical position.
Raise the frame until the latch knob locks into the storage position. Make sure that the latch knob is locked in the storage position. To protect the floor or carpet from damage, place a mat under the treadmill. Keep the treadmill out of direct sunlight. Do not leave the treadmill in the storage position in temperatures above 85° F (30° C).
To lower follow this procedure:
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.
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.

first make a small hook on the end of a straightened paper clip. insert the hook and pull up rotating the hook as you pull up. being careful not to bend the spring near the hole. once the back door is opened check the rewind shaft, there should be a beveled edge on the collar of the shaft. rotate the shaft while pushing up. if no beveled edge on the shaft use the paper clip to push the spring out of the way while inserting the shaft. if it still will not return file a bevel on the collar of the shaft. I am assuming there is no film in the camera as the canister will prevent the shaft from falling in.

Make sure your tension spring is in place. Insert the plunger from the inside out with the spring in place. Then screw your knob into the plunger and you should be fine.

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.