Turned on the machine as I normallly do, raised the incline to 5, and went to select the speed, and it started to speed up on its own and almost threw me off. I turned off the machine to follow the direcitons previously given to me for the calibration, and the "314" code does not appear. I get a "728" code that appears. So I tried to proceed through anyways to E91 and it starts to calibrate by raising the incline all the way and then keeps trying to push it up while it clicks several times, then it will lower it and just stop. The speed does not start at all. Please help!!
Follow the next steps and fix it.God bless you
The Steps for Newer Style
Console Calibration
1.
Locate the calibration area on the
rear or underside of the console (a hole, near the console's center, that goes
through to the electronics board. (This hole should not have a screw in
it.)
2.
Insert a pencil (eraser end),
into the hole and feel around for the cal button (will click when
pressed).
3.
Press the button 2 times
(with the pencil eraser). The first click should show CL11 in the
console, the second click should show CL21.
4.
If the process was done correctly, and
CL21 appears in the console, you are in "calibration mode." The
next few steps consists of pressing buttons on the console and
observing settings. This will not require any other tools.
5.
Press ENTER. CL22 should display in
the TIME window and (??) in the SPEED window.
6.
Press ENTER. CL23 should display in
the TIME window and (??) in the SPEED window.
7.
Press ENTER. CL24 should display in
the TIME window and (??) in the SPEED window.
8.
Press ENTER. CL25 should
display in the TIME window and (??) in the SPEED window.
9.
Press ENTER. CL26 should
display in the TIME window. You should then see the letter
"E."
10.
Press ENTER. You should see
"SS" or "55" in the console.
11.Push the STOP/START button. For safety, at
this point, you should step off, or be off, the treadmill.
12.
Push the ENTER button. The walking
belt should start to move, accelerate to maximum speed, then stop on its
own.
13.
When the belt stops, the
incline should self test by raising to its highest incline
position, then lowering back down to its lowest position.
14.
Once the incline test is complete,
push the POWER button 2 times. The unit should shut off and the console
should go completely blank. If this happens, the treadmill is
done calibrating and is ready for use.
15.
If the letter "F" appears in
the SPEED or INCLINE window when the power button is pressed 2 times, the
treadmill is indicating a failure somewhere either in the SPEED or INCLINE
(depending on the window the "F" appeared in). Troubleshooting
the failure would be the next step.
SOURCE: Nordictrack COmmercial 1500 console buttons don't work
http://www.fixya.com/support/r10724803-measure_voltage_in_transforme_fitnes
sincerely. Please keep me in touch.
SOURCE: lower incline
Dear Sir:
I STRONG recommend RUN the calibration Software Inmediately, for eay Diagnose and troubleshooting, most of them instruction has coming in the Hood of Motor, follow the instruction or use your instruction manual.
Adjust the sensor speed attached the diagram. Tight the wires from sensor speed. The sensor speed can be faulty. Adjust the Pot with the gear in the same motor, both can be faulty. And finally the main motor board can be wrong. sincerely.
God bless you.
ernesto cuadra
managua, nicaragua. 
LUBE or wax the deck belt, this happen because you do not have schedule maintenance according with the owner manual. The machine shut down for autoprotection in electronic system Do it NOW.
2) LUBe the rollers bearint too with WD-40 only for rollers
3) Test the drive belt motor, for worn or cracking belt, replace or adjust it
4) Test the input voltage motor, if there are the motor need repair, see my personal TIPS for troubelshooting help.
5) Test the output voltage board, for input voltage motor, if there are NOT the board is faulty.
God bless you
sincerely. Please keep me in touch.
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