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The incline motor is jammed due to a faulty incline sensor or incline motor assy. This is somewhat hazardous if you do not know what you are doing to remove the incline motor. Sometimes you can repair it most of the time you replace the incline motor assy. Must be calibrated upon completion.
Check that the incline plus switch is not jammed or likely there is a defect in the panel circuit causing plus incline to be repeated. This needs to be trouble-shooted by removing and testing the panel circuit.
Try the calibration procedure found in the troubleshooting section of your manual first. Here are the basic instructions. With the key in the console, press one of the Incline buttons. While the incline is changing (or the numbers on the console) , remove the key. After a few seconds, re-insert the key. The treadmill will automatically rise to the maximum incline level and then return to the minimum level. This will recalibrate the incline. If it still doesn't move, remove the cover. Find the incline motor. You will see a slot in the end of the motor. Using a drill with a standard slotted screwdriver bit, spin the motor counterclockwise (if it is having difficulties spinning, turn clockwise instead) for just a couple seconds. Now do the calibration procedure again. I have had machines that got stuck before. Once released and recalibrated, the operation was OK. The service number for your machine is found on the model number sticker on the frame of the treadmill.
With the key in the console, press one of the incline buttons. While the incline is changing, remove the key. After a few seconds reinsert the key. The treadmill will automatically rise to the maximum incline level and then return to the minimum level. Thi will recalibrate the incline system.
It sounds like you just need some calibration. To calibrate incline, turn power on press press any incline buttons, as the incline try to change unplug the key. Now re-nsert key and incline will self calibrate,
I don't know what model you have, but on some treadmills in the front there is an adjustment by a t-bit screw for calibration. You may want to try and unplug it and have someone hold the incline button while you replug it. Sometimes the program gets a glitch and a fresh restart from being unplugged corrects it. If you could list your model and brand I could be more detail specific.