How do I fix an ERR70 message on the display of my 9.21 treadmill.

If you wiah to get some details about treadmill error codes and solutions then check the following link
http://electro-medical.blogspot.com/

check the key switch and adjust it

This may be a faulty speed sensor.
Or a faulty LCB

reset the machine and follow the step and fix it.

• 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

follow this steps and fix it. God bless you
Plug Treadmill into wall outlet and press
START.
Display lights up; TREADBELT DOES NOT MOVE "L5 / LS ERROR"
Is red SERIAL lamp on the motor control
board lit?
Is the yellow RLC lamp on the motor
control board lit?
1. Unplug the treadmill from its
2. Wl alk on the belt manually. (push belt)
3. Does the yellow MOTOR lamp light while pushing?
Is yellow MOTOR lamp on the motor
control board lit?
1. Loose wire connection to motor, capacitor, or choke.
2. Loose brush holder screw on motor. (Check Both)
3. Failed drive motor. Part # 70014 (110V), 70125 (220V)
NO
YES
NO
YES
5.1
5.2
5.3
5.4
5.5
NO
1. Check wiring harness connection between
upper and lower board. Part # 70083
2. Replace display board. Part # 70076
YES
Enter Open Loop Speed mode:
WARNING: NEVER STAND ON THE TREADBELT IN THIS MODE.
1. Turn off the treadmill.
2. Press FAST and START simultaneously and release both buttons once the display lights up.
3. Hold the fast button until the display reads 99.
Short in capacitor, motor, or motor
control board.
NO
Turn treadmill off. Disconnect drive motor wires from lower control board (Mtr + and Mtr -)
terminals. Power up in OLS mode (FAST & START). Bring displayed speed up to 99.
Measure across the Mtr + and Mtr - terminals with your voltmeter (DCVolts). You should
measure at least 90 vdc on a 110V treadmill and 180 vdc on a 220V treadmill.
If you are not getting dc volts out of the lower board, replace it.
If you are measuring the proper dc voltage out, replace the drive motor.

try to LUBE inmediaitely and fix it. God bless you

i have the same treadmill with an error 10 message. i have the booklet that came with it and it says that an error 7 message indicates(too much to write). I can fax the error message page and the wiring schematic to you. my email is [email protected]. not posting my number here.

You may have a beltand deck problem. Test by the following procedure:
without the poweron stand on the walking belt, push the belt in the, direction it normally turns. If the belt is very difficult to turn (on most treadmill this means that you have high belt/deck friction I first apply silicone lubricant between the belt & deck to see if that clears up the problem. Most problems originate from the belt and deck 75 to 85% of the time

The FET error message is caused by the driver transistor on the motor controller has shorted out. Unfortunately, the fix is replacing the motor controller.

Trimline treadmill starts up then code E2 comes up, and the display shuts down. 
Any ideas???