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Nautilus NTR 800.6 Treadmill. I can go up on speed and incline but not back down?

I am hoping the entire electrical board is not toast. I am able to go up with the speed as well as incline, but not back down on speed or incline. I have tried unplugging it, etc but it still is not working. Any suggestions would be greatly appreciated. Thank you!

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Please RUN the software calibration, for easy diagnose, troubleshooting, and fix it.
Test the speed sensor, for open or faulty, clean it, and tight the connector very well. see the diagram
Happy New Year. God bless you
Nautilus NTR 800.6 Treadmill. I can go up on speed - 1_2_2013_1_25_28_am.gif

Posted on Jan 02, 2013

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Posted on Jan 02, 2017

  • 11 Answers

SOURCE: Treadmill belt adjustment

There are two bolts on the back of the treadmill. Turn the right side clockwise to make the belt go left, turn the left side clockwise to make it go right. Never tighten more than 1/2 turn at a time, and do this while machine runs at 2-3 mph. Belt should be just tight enough to not slip. If your belt is really tight and it still slips you have other problems.

Posted on Feb 09, 2011

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Calibrate nautilus T914


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.
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. The Calibration seq

God bless you

May 22, 2013 | Nautilus T914 Commercial Series Treadmill

1 Answer

Nautilus treadmill- I can go up on speed but not back down


please RUN the software calibration for easy diagnose, troubleshooting, and fix it.
Test the speed sensor, for open or faulty, clean it, and tight the connector very well, see the diagram.
Happy New Year. God bless you
1_2_2013_1_29_30_am.gif1_2_2013_1_29_49_am.gif

Jan 01, 2013 | Exercise & Fitness

1 Answer

Lubricant belt zoom


go to www.fitnessrepairparts.com or www.treadmilldoctor.com and buy it the LUBRICANT belt.

God bless you

Jul 21, 2012 | Nautilus Ntr 800 Treadmill Lift Motor

1 Answer

I have a Precor 9.33i Treadmill. It works perfectly until I start to walk/run on it and then it shuts down. What is causing this?


LUBE THE deck belt, this happen because the system protect the electronic system, with shut down.
2= LUBE THE ROLLERS BEARINGS TOO
3= measure the input voltage motor, if there are the motor need repair
4= measure the output voltage board, for input voltage motor, if there are NOT the boar is faulty.
see the block d
God bless you
7_20_2012_9_39_47_am.gif

Jul 19, 2012 | Nautilus Ntr 800 Treadmill Lift Motor

1 Answer

Belt wont turn.


Press the Stop and the Speed Up keys down while inserting the safety key. This should get you into calibration mode. Press the Stop key one time. The Time window should read EP:2P. Some newer models may also say FP, Pass, or the like. This means that it passes the EPROM test. If you cannot get into calibration or if the EPROM test fails then the upper console will have to be replaced.
If you get pass to this point then proceed with the calibrating the incline and speed.
Press either incline key and the incline will calibrate automatically.
Be careful the treadmill will run at full speed in the next mode DO NOT STAND ON THE WALKING BELT.Press the Speed Up key and hold it down until 85 is shown in the Distance window (some models may show the 85 number in another window).
If the top speed of the treadmill does not match the displayed speed on the computer console, adjust the max speed potentiometer (pot) on the motor control board. This is the board that the red and black motor wires connect directly into in the motor area. The Max Speed pot is clearly labeled
The max speed potentiometer is a small square with a mobile center and is located in one corner of the board and is labeled MAX SPD. It is near the harness that carries the speed signal labeled H,W,L. Using a small insulated screwdriver adjust this potentiometer clockwise to speed up and counter-clockwise to slow down the max speed of the treadmill. A tiny turn of this potentiometer will make a big difference in speed so be careful when making adjustments.
It is not important to get the speed set exactly at the max speed of the treadmill but do make sure to get the speed within .2 MPH of the max speed of the treadmill. For instance if the max speed of the treadmill is 10 MPH, make sure to have the speed set between 9.8 MPH and 10.2 MPH. Some models have a 12 MPH top speed, so please check your manual if you aren’t sure.
After completing calibration of the speed, press the Speed Down key. The treadmill will automatically return to 0 MPH. Please allow the unit to stop completely before continuing. Press the Stop key once and remove the safety key.

Jul 18, 2010 | Proform 380 CS Treadmill !

1 Answer

When you turn on treadmill the incline goes all the way up and all the way down. Does nothing else.


First we need to do a calibration follow this procedure
Press the Stop and the Speed Up keys down while inserting the safety key.
Press the Stop key one time. The Time window should read EP:2P. Some newer models may also say FP, Pass, or the like. This means that it passes the EPROM test.
Press either incline key and the incline will calibrate automatically.
THIS IS A VERY IMPORTANT STEP BECAUSE YOU WILL GET AN ERROR MESSAGE IF THIS STEP IS SKIPPED. After completing calibration of incline, press the Stop key and then remove the safety key.
If the incline moves but you it will not operate normally nor calibrate, check the wiring from the incline sensor to the power board. If all looks normal, put it back in calibration and see if you see a blinking “- -” symbol in the incline window when you are calibrating. If not, the incline sensor is bad Call icon Fitness @ 800-999-3756, they may have the sensor or they tell you, you need to replace the incline motor

May 29, 2010 | Proform 675 E Treadmill

1 Answer

I have a Image 15.5 Treadmill, it turn on, Incline...


First we need to do a calibration follow this procedure
Press the Stop and the Speed Up keys down while inserting the safety key.
Press the Stop key one time. The Time window should read EP:2P. Some newer models may also say FP, Pass, or the like. This means that it passes the EPROM test.
Press either incline key and the incline will calibrate automatically.
THIS IS A VERY IMPORTANT STEP BECAUSE YOU WILL GET AN ERROR MESSAGE IF THIS STEP IS SKIPPED. After completing calibration of incline, press the Stop key and then remove the safety key.
If the incline moves but you it will not operate normally nor calibrate, check the wiring from the incline sensor to the power board. If all looks normal, put it back in calibration and see if you see a blinking “- -” symbol in the incline window when you are calibrating. If not, the incline sensor is bad call icon Fitness @ 800-999-3756, they may have the sensor or they tell you, you need to replace the incline motor

May 21, 2010 | Icon Image 17.5 S Treadmill

2 Answers

Treadmill belt adjustment


There are two bolts on the back of the treadmill. Turn the right side clockwise to make the belt go left, turn the left side clockwise to make it go right. Never tighten more than 1/2 turn at a time, and do this while machine runs at 2-3 mph. Belt should be just tight enough to not slip. If your belt is really tight and it still slips you have other problems.

Jan 03, 2010 | Nautilus Exercise & Fitness

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