We have a 600 mx and the pad is not working, the only button working is the start, i cannot increase speed or incline it either.

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By increasing the incline level on the treadmill, you will increase the number of calories burned during your workouts. Incline training works the leg muscles differently and more efficiently than training on a level surface. Incline training provides a great cardiovascular workout without having to increase speed.

The micro switch is probably bad, the button (micro switch) needs to be replaced.

Treadmill console needs to be replace

RUN the software calibration for diagnose, 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.
    

Must enter the engineer mode. Turn the machine ON. Wait until you see the "Select user" screen.
1 - Press and hold the key to increase the incline and the key to decrease the speed for 3 to 5 seconds.
2 - Use the arrows to increase speed to get to Eng3 program (or the arrows next to the Enter button).
3 - Press "Enter"
4 - Then press the green start button until KM appears on the screen.

It sounds like you have a membrane issue. There are a number of different T9450 models and they all have slightly different consoles. You'll need your serial number to help pinpoint the parts you need. Your best bet is to go through the manufacturer (johnsonfit.com) and have them help you get the correct membrane and overlay.

Hi,

I will advice you try re-calibrate your treadmill, follow the procedure below to re-calibrate it,

Step 1 Stand on the side rails of the treadmill for safety purposes. Remove the safety key. Step 2 Press and hold the two incline buttons. The incline buttons are blue and on the left side of the display. Hold the up and down button simultaneously. Release the buttons when the display reads "Calibration."
Step 3 Press the green start button located either above or below the large, red stop button (depending on your model). Stay on the side rails as the treadmill belt begins to move. Both the speed and incline should go through their full range from lowest to highest, and then back down again.
Step 4 Repeat the process if the display does not read "Calibration Successful."

Most likely the console is faulty. If the speed and incline buttons work and the numerical display is incomplete the console is at fault.

Try Re-Calibrating 1st, here's how.
With the Treadmill off, press and HOLD the SPEED UP & STOP
keys, while holding the speed up & stop keys insert the Safety key (Magnet) release the speed up & stop keys. now press and release the stop key. now press the "incline up key" let the treadmill go to max incline,after it stops press and hold the "incline down key" let it go to minimum (completely lowered) you should now be re-calibrated.