E21 keeps appearing on console on horizon adventure 4 treadmill

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Use lubrication oil obtained from horizon fitness !
google search horizon fitness find nearest store to you

http://www.livestrong.com/article/209998-how-do-i-lube-a-horizon-treadmill/
once lubrication is complete, reset the console by pressing and holding 'STOP' and Speed '+' buttons for 5 seconds
https://www.greenfitco.com/Fitness_Manuals/Horizon/Horizon-Treadmill-T91.pdf !page 30 !

The cause of this problem is because your powerboad need big power (Amp) to turn the motor (and the belt) This usually happens if your treadmill belt is not lubricate well or needs change. So, first try to lubricate your treadmill belt with silicone oil and be sure that treadmill deck is clean. If the problem continues you must change your treadmill belt.
Greetings from Greece

follow this steps and fix it. God bless you

1.

• 1

Unplug the treadmill. Locate the console key and place the safety or reset key into the treadmill console. Replace any parts that need replacing, or is large enough to trigger with a pencil eraser or Q-tip. Plug the treadmill plug back into the wall. Use the Q-tip to press the reset button. It may be necessary to hold the reset button down for a few seconds. "CL11" will appear in the display of the treadmill.

• 3

Press the reset button one more time with the Q-tip. "CL21" should appear on the screen. Press the enter key. The display will change again and show "CL22." Keep pressing the enter key until the numbers cycle through to the number "CL26." Press enter one more time. The letter E should appear on the display screen.

• 4

Press enter twice more. The letters "SS" should appear on the screen. When this happens, press the start/stop key. Making sure to keep well away from the tread, press enter to start the treadmill. The treadmill will start on its own. The treadmill will stop on its own after a few seconds. When it stops, press the power key two times. Remove the safety key and put in a safe place. Your treadmill is reset.move on to the next step.

• 2

Locate the reset switch on the underside of the treadmill console. Usually the button

Step 1:

see the diagram attached.

Clean the motor, lube the gear+shaft
Adjust the small POT for a little.
RUN the software calibration for troubleshooting. see the diagram

Step 2:

Step 3:

Step 4:

he 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.
God bless you

Dear ir:
Any treadmill you can RUN in miles or Km whatever you decide.

You can adjust in your menu, or read the instruction manual for adjust. If you do not have any user manual , download for free in www. horizon.com or www. fitness.manualsonline.com give your model and ready.

sincerely. God bless you.

ernesto cuadra
managua,nicaragua. c.a

The E21 error code indicates that the console is not receiving a signal from the sensor that controls the speed on the treadmill. This means there could be a problem with the speed sensor. You may need to have a technician check the voltages on the power board and controller.

Call Horizon at 800.244.4192

Sounds like there is a stuck button on the console, or possibly a loose ribbon cable inside the upper console maybe?

Does the console power up? Will elevation work? All console keys appear to work? Smell anything before tread died?