My treadmill is stuck in the max incline position

You have to check the position switches at both upper and lower position of the incline. If the switch or sensor is faculty then the incline Motor will not stop and will go beyond the limit.
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Sounds to me like the motor has a shorted field coil or open or shorted armature. The motor is bad, you can order a new one at the companies website.

This sounds as though the motor is bad, they cost around $130.00, ther is a n electronic controller that controls it, but as it is trying to raise I would think that the switch and controller are functioning. Best of luck and please post back f this helps.

My treadmill won't stays in the incline position can't get it to come back down

hi, i also have problem with my horizon htm 3000, incline motor stuck.
did anyone know where to buy brand new incline motor?
and how much it will cost?

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.

if that is where it catches then that is how far it goes there is no adjustments. Make sure the incline is the whole way down

Usually when stuck at the max up position it indicates that you may need a new incline motor. It is not the sensor. I have been repairing treadmills for 15 years and incline sensors seldom if ever go bad. If can isolate the incline motor using a 110 volt power cord, this may un-jam the motor and get it back down to 0%.
I use www.treadmillpartszone.com for parts.

It sounds like the belt is bogging down, this condition is when the treadmill operates normally without a person on the belt and then slows down when someone steps on the belt or when the treadmill operates normally for a given period of time with someone on the belt then abruptly begins to slow down.
The only certain way to test for a worn walking belt is to take a DC amp draw . Trying to look at the belt or a feel test is highly unreliable. Better tests, if you lack a DC ammeter (they are expensive for a good one), are a coast test or an incline test.
The coast test is to get on the treadmill as the lowest incline setting and walk on the treadmill at 3 MPH. Pull the safety key and it should take you 2-3 full steps to stop fewer steps indicate high friction.
The incline test is to put the treadmill at max incline and walk on it at 3 MPH. If the treadmill operates normally at max incline but bogs down at minimum incline, replace the walking belt. Gravity takes over for the drive system eliminating much of the friction problem. On some heavily worn walking belts, this test will not eliminate the problem.

Try this calibration procedure.
Turn the power switch on. Remove the safety key. Hold the Stop and Speed Up or Speed Plus buttons down then insert the safety key.
The display should show some numbers.
Press the stop key one time and the display should show some other numbers and some 00's. Press the Incline Up button and see if the Incline begins to move, if it does let it go all the way up and then all the way down, wait a few seconds after it stops, then hit the stop key 4 times. It should be calibrated. If it didn't move then the board or the incline motor is bad.