Hi I have treo treadmill and when it starts then it runs for about 1 second and stops. The incline is fine and the belt tension seems ok and runs freely.

SOURCE: Pro-Form Sport 1000 treadmill does not stop inclining

Do a Calibration on the treadmill. Take out the safety key. With 2 fingers, hold down the stop button and the speed up or spped plus button. keep holding them down as you insert the safety key, then let go of both.
Press the stop button 1 time, you should see all 0's in the windows, or EP 2P or something weird like that.
Press the Incline up button and then wait. If the incline go up until it stalls then down until it stalls the stops at the bottom, the you are recalibrated, take out the safery key and put it back in to see if all is well. If the incline takes off up again without touching a button, the you have wiring problems or control problems. Call service company to get it repaired.

SOURCE: image 15.0 treadmill will start but stops after 30 seconds to 1 m

how to fix

SOURCE: MY TREADMILL STOPS JUST A MINUTE AFTER STARTING.

Try Lubricating the belt with silicone spray.
Probably the resistence from the belt scraping over the ground board is too high, forcing the machine to switch off in order to prevent damage.

SOURCE: Treadmill incline error

Try this, it fixed it for me, if it doesn't work let me know
http://www.youtube.com/watch?v=MIIxoPtvhy8

I bought a used Precor 9.4 treadmill, but the incline adjustment was not working.
So, I did the following.
1. Turn off, unplug the treadmill and wait for an hour (this is for safety
2. Remove the black motor cover
3. Observe the transformer to the right of the motor and towards the belt ( I point to it in the video)
This transformer converts DC electricity to AC electricity and the AC current goes directly to the Incline motor which is in the black box towards the front of the machine.
4. On mine the wires had come loose from the transformer, they were soldered on very poorly, the wires are stiff and you should be able to see 4 wires coming from the top of the circuit board and plugging into the transformer, I had three of the 4 wires loose.
5. If you are not comfortable working with electronics or soldering DO NOT DO THIS REPAIR, you could get shocked very badly if you just go poking around in there with metal objects, get a friend who knows how to solder or hire someone.

6. It took about 5 minutes I just heated up my $10 soldering gun from radio shack and soldered all the loose wires that were about a millimeter away from the tabs on the back of the transformer, and VOILA! The incline now works!

SOURCE: Proform 590 HR Treadmill. Belt won't run

Hi, i fixed one just the other day, the control unit fails.
broddersbaldrick on a big auction site fixes them :)
Hope this helps