Sportcraft treadmill when starting up it will stay on for about three to five seconds then it will cut off and have the number 3 where the distance and pulse number is suppose to be can't figure it out won't stay on..

If you wish to get some details treadmill repair and error code ; check the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/

Ok. So the first thing to try is to calibrate the speed.
You do this by doing the following:

• With the SAFETY KEY in place, hold the ELEVATION UP and SPEED DOWN buttons for five seconds. The console will beep twice, "ENG0" will appear in the Distance window, and a number will appear in the Elevation window.
• Press SELECT until "ENG3" appears; this is for Auto-Calibration.
• Press START to Auto-Calibrate.
• The treadmill will calibrate minimum and maximum speed, and minimum and maximum elevation. When Auto-Calibration is complete, the treadmill will reset to User's start screen. This process takes three to five minutes.

Make sure there are no errors. . .and that the speed goes from super slow to super fast and then stops. . .. if it stays slow. . or stays fast. .or error code appears during calibration, there is a problem.
If after a good calibration sequence, if it still does the stopping and E-1 after 10 seconds. ., then you need to (Power off and disconnect treadmill). . .then unplug the speed sensor from the lower power board, blow into the connector on the wire, and add a little contact cleaner spray to the connector on the board.
Recap: If it actually runs. . .but stops after a few seconds. . but the calibration runs and passes fine. .. .more than likely it is a speed sensor misread or a faulty speed sensor.

see the video attached. LUBE too the rollers bearing front +back and test the drive belt motor, and replace if necessary.
God bless you

Did u find out the problem? Mine just started doing the same thing.

Dear sIR:
This by lack of LUBE, in your schedule maintenance DECK BELT. maybe the belt is worn.
2) Lube the roller bearing.
3) Align the belt see the diagrams
4) Test the input voltage motor, if there are voltage motor, the motor need repair.
5) Test the output voltage board, for input voltage motor, if there are NOT the board is faulty.
Now you can RUN the software calibration for diagnose, troubleshooting. See my personal TIPS for HELPs too.

sincerely. God bless you

Error code seven is due to the console getting locked. I called Sportcraft and they said to do this: Unplug the treadmill for five min and then re-plug the treadmill. Now push the ON/OFF switch to ON and insert the safety key. Now press the MODE and STOP button simultaneously. Without releasing the buttons take out the safety key and insert it again. Now you should hear a beep and the display will come on. Release MODE & STOP and now press the Speed increment (+) button

I have a TX350 sportcraft treadmill and I keep getting shocked when I use it. How can I stop it ? I no longer have the user manual for it either. Can I get one ?

you have a broken spinner. Take hte motor cover off and look on the opposite side of the motor. there will be a partof the spinner wheel there. I have yet to find a way to short cirut the connectors nor a replacement wheel.

Info from PDF files located on Sportcrafts website under manuals.
E3 – No speed sensor reading. Unit shuts down. This is the most difficult repair diagnose. The speed
sensor is connected to the frame of the treadmill near the drive pulley on the front roller. There is a
small magnet on the side of the pulley wheel. The sensor tip must be no more than 5mm from the
magnet. If for any reason the distance is greater than 5mm the treadmill will shutdown
Adjust or replace speed sensor.
Treadmill: Speed Sensor Replacement
1. Make sure your treadmill is unplugged before you begin.
2. Remove the motor cover located in the front of your treadmill, it is held on by a few screws.
3. Locate your speed sensor; it is the small T shaped part with a red and black wire coming from it.
4. Remove the 2 screws in the speed sensor and remove the old sensor.
5. Place the adjustment holder on the frame with the open holes facing the pulley wheel, the prongs facing
up and way from the pulley wheel. Insert the screws but don’t tighten fully.
6. Now place the speed sensor over the prongs with the square part facing the pulley wheel and the red and
black wire to the far right.
7. Plug the treadmill back in and slide the speed sensor until it is 5mm from the magnet inside the pulley
wheel, you may have to do this several times until you can position it so it no longer shuts down. Use 2
nickels to figure out the spacing. The width of 2 nickels is 5mm.
8. Once you find the correct position tighten the screws all the way; being careful not to touch any of the other electronics
9. Place the motor cover back on and enjoy your machine.

Sorry I dont have the solution but I have the same problem.
Read somewhere that Sportcraft control boards had
a design flaw.