Epic Comfort step 425mx treadmill that we have is stuck on incline. How do I get it to go back down?

First off remove the errant object.

Run the software calibration for easy diagnostic and fix it. Lube the incline mechanism. Go to Hood cover motor and follow the steps or read your owner manual.
God bless you

Oiling the deck of the treadmill with a silicone-based lubricant is an important aspect of routine maintenance

You can buy online: www.fitnessrepairparts.com
or www.gympart.com

sincerely.

E.CUADRA
MANAGUA,NICARAGUA

Dear Sir:

I can send to the web page for you contact service repair:
http://fitness.manualsonline.com + www.treadmilldoctor.com

since that i can not arrive, because I AM live in Managua, Nicaragua.

sincerely. God bless you.

E.CUADRA
MANAGUA, NICARAGUA. C.A

Try to recalibrate the incline. Start the machine running, press the incline up button, then pull the safety key off. Release the incline up button and replace the safety key. The treadmill should go to maximum incline then minimum. after calibration is completed, retry the treadmill operation.

First try to calibrate the incline as described in your owners manual.
Start the machine. Press the incline up button. While pressing the button, remove the safety key.
Release the inline up button and reinsert the safety key. The machine should run the full cycle, up to maximum elevation, then back down.
If the motor moves and then resets, you may have an incline motor sensor defect. You will need to order a new incline motor. The sensor is not available separately..

You will need to loosen the rear roller off 8-10 turns on both sides to reinstall the motor drive belt...

Check the motor belt tension and the walkbelt tension first. If iether is loose the walkbelt will stop.

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.

Check the motor and the gears that run the unit up and down. If is located on the front of the unit under the face plate. make sure everything is power everything. Also check the gears to make sure they did not break and check the tracks to make sure it did not fall off the track causing it to stay up