My smooth fitness 5.25 treadmill keeps stopping on me. it starts and i can raise and lower the elevation. but the belt stops after a few minutes. sometimes it will start again and other times it won't start. i was told i need the lower control board, pt. 505 for $300 . any suggestion?

I have this same issue, have you found a solution?

The machine is struggling under load, it’s either a really badly damaged running belt with no lubrications. Or, a motor on the way out. Or, you are exceeding the weight limit of the treadmill.

check adjust belt tension
may have to clean under belt area as there could be a build up that is stopping the free movement of the belt as it gets hot

1) Well examine the Lube of walking belt, DO it if you are NOT, must be every 40 hours of training. VERY IMPORTANT.
2) see if the Walking belt is tight? Normailly you must Lift with his finger 2-3" of Hight, IF NOT see Video. How To Adjust Treadmill Belt
The thermical relay tripped from the motor to due this problem.must wait for Normal condition, for elevated temperature.

3) See the drive belt of belt motor is tight, loose the Bolts motor and the deflectin will be 1/8" tight again bolts,

4) If after doing all the steps before,THE problem persist, Replace the Controller Board Motor.

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.

There are a few things you may need to check. You already tried calibration. Next thing I would do is check the sensor wire from the incline to the controller. Make sure its properly plugged into the controller. The controller can also be an issue. If someone was tampering with the unit, the sensor wire could be plugged into the wrong connector as there is another connector that will fit. You may contact me for phone support or sign up for phone support at Treadmill Repair Fitness Equipment Repair Parts Services Fitness...

Lube the treadmill for deck belt+roller bearing too.
This happen because the lack of maintenance schedule.
See the video, if after you fix it, the problem remain, is TIME to replace the old deck board.
God bless you

Check the connector to the belt motor.

With the safety key in place, press and hold “ELEVATION UP” and “SPEED DOWN” for 5 seconds. The software version will appear in display window shortly before model number appears. Press “ENTER” to accept correct model number IF YOU CANNOT GET INTO CALIBRATION EITHER UPPER CONSOLE ELECTRONICS OR OVERLAY CONSOLE ASSEMBLY HAS FAILED.
• Press “STOP” to enter “ENG1”. Press “ENTER”. PLEASE NOTE: HR Window = “0” for miles, “1” for kilometers, treadmill will calibrate in kilometers if set for kilometers. STEP 2 MINIMUM SPEED • Press “ELEVATION DOWN” button, “P0” will appear in display. • Press “START” button, the running belt will begin to move at minimum speed. • The display window should read approximately “.49 - .51”. • To adjust, press “SPEED UP” or “SPEED DOWN” buttons, the range should be “.49 - .51”. Press and hold “ENTER” to save changes. Press “STOP” to return to “P0”. STEP 3 1/4 SPEED • Press “ELEVATION UP” button, “SP1” will appear in display. • Press “START” button, the belt will move 1/4 speed. • The display should read approximately “2.71 - 2.73”. • To adjust, press “SPEED UP” or “SPEED DOWN” buttons, the range should be “2.71 - 2.73”. Press and hold “ENTER” to save changes. Press “STOP” to return to “SP1”. STEP 4 1/2 SPEED • Press “ELEVATION UP” button, “P1” will appear in display. • Press “START” button, the belt will move at 1/2 speed. • The display should read approximately “6.72 - 6.73”. • To adjust, press “SPEED UP” or “SPEED DOWN” buttons, the range should be “6.72 - 6.73”. Press and hold “ENTER” to save changes. Press “STOP” to return to “P1”. STEP 5 3/4 SPEED • Press “ELEVATION UP” button, “SP2” will appear in display. • Press “START” button, the belt will move at 3/4 speed. • The display should read approximately “9.41 - 9.43”. • To adjust, press “SPEED UP” or “SPEED DOWN” buttons, the range should be “9.41 - 9.43”. Press and hold “ENTER” to save changes. Press “STOP” to return to “SP2”.
STEP 6 MAXIMUM SPEED • Press “ELEVATION UP” button, “P2” will appear in display. • Press “START” button, the belt will move at maximum speed. • The display should read approximately “12.10 - 12.12”. • To adjust, press “SPEED UP” or “SPEED DOWN” buttons, the range should be “12.10 - 12.12”. Press and hold “ENTER” to save changes. Press “STOP” to return to “P2”. STEP 7 MINIMUM ELEVATION • Press “ELEVATION UP” button twice, “P4” will appear in display. • The display should ready approximately “190 - 205”. • To adjust, press “ENTER” for value which should read “190 - 205”. Use “SPEED UP” or “SPEED DOWN” buttons. Press and hold “ENTER” to save changes. Press “STOP” to return to “P4”. STEP 8 MAXIMUM ELEVATION • Press “ELEVATION UP” button, “P5” will appear in display. • The display should read approximately “750 - 765”. • To adjust, press “ENTER” for value which should read “750 - 765”. Use “SPEED UP” or “SPEED DOWN” buttons. Press and hold “ENTER” to save changes. Press “STOP” to return to “P5”. REMOVE SAFETY KEY TO EXIT ENGINEERING MODE REPLACE SAFETY KEY AND PRESS START TO TEST TREADMILL

LED Blink Patterns on the Control Board Treadmill Treadmill Maintenance How To Lubricate Treadmill Belt
Try to do this steps in order to fix it.
However if the problem persist.
Time to replace the Controller board Motor.
This board has 3 power supply control:1) Console Board 2) Elevation Motor 3) Main Motor.
One of IGTBs is faulty.
Blessing.
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