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I have a Proform J8 treadmill. It is about 12 years old. After setting the speed, it changes to read 0.0 and speeds up faster than the speed it was set at. I have calibrated it a few times. Does it need a new speed sensor? Is this difficult to fix?

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Motor controller and speed sensor both are malfunctioning

Posted on Aug 14, 2010

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go under the HOOD cover the instruction for RUN the software calibration for easy diagnostic , and fix it.

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Proform Treadmill 785 E suddenly stops during highs speed workout


Use 2000W converter instead of 750W because you are using your treadmill on its full power on high speed. 750W converter is not capable of handling its full load resulting the machine malfunctioning. Your treadmill 785E have 2.25 CHP motor, 2.25 CHP is equal to 1677.824712W and 20-Amp minimum Ac outlet is required for your treadmill in order to function in full capacity. Download user's manual on: https://www.sportsmith.net/images/product_support/ProForm/PFTL785081%20-%20PROFORM%20I%20SERIES%20785%20E%20TREADMILL/PFTL78508.1-274823.pdf See Horse Power to Watts Converter on: http://www.rapidtables.com/convert/power/hp-to-watt.htm

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1 Answer

My proform j8 speed up button does not increase speed


1) adjust the speed sensor, test it, clean it, and tight the connector very well. se the diagram
2) RUN The software calibration for troubleshooting, and fix it. go under the hood motor and follow the instruction or read your instr. manual very well how to enter in the s. calibration
God bless you
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Nov 12, 2012 | Proform Exercise & Fitness

1 Answer

I need to calibrate the speed of my ProForm 680 LT.


Remove the front motor cover. Inside is a copy of the tech sheet. The procedure is outlined there.
These machines do not do an electronic calibration, it is a mechanical one. You must adjust the motor controller for max speed by following the procedure outlined.
If the speed readings are incorrect, you may be set for Kilometers rather than Miles. It's easy to determine. 3MPH=4.8KM...
Follow the procedure in your owners manual to change from metric to miles..

Dec 12, 2010 | Proform 680 LT Treadmill

1 Answer

I have a proform 785..the problem is the speed and incline decreases all of a sudden like within a minute...i raised the speed to 4 and it dropped to 2 within 1 min and same thing with the incline it...


Unplug unit remove motor shroud then start calibration procedure.
Press the Stop and the Speed Up keys down while inserting the safety key. If you cannot get into calibration then upper console needs to be replaced.
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. At this point if it show 2F FF or Fail then upper console needs to be replaced.
Press either incline key and the incline will calibrate automatically
BE CAREFUL, THE TREADMILL WILL RUN AT FULL SPEED IN THIS NEXT MODE! DO NOT STAND ON 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.

Jun 11, 2010 | Proform 785 CS Personal Trainer Treadmill

1 Answer

I have a model 297980 J8 proform treadmill. when I first start it up without the safety key in it, the treadmill runs at full speed for about 2 minuets. After that it slows down and stops. The speed is set...


You have to put the safety key in if you want to select speed/incline or predefined programs.
It starts and runs at full speed on that occasion because it's part of the maintenance process, that lubricates the inner rollers so that it will continue to work perfectly for as long as possible.

May 01, 2010 | Proform Exercise & Fitness

1 Answer

Speed indicator and belt problem


Under the motor hood by the front their is usually a speed sensor either not working or not adjust close to pulley where magnet is locate in , when it passes by the sensor it should read it.

Feb 24, 2010 | Proform Crosswalk 500 Treadmill

1 Answer

Proform CS17e speeds up by itself after 10 minutes.


You probably need a new speed censor. If you bought it new that part should be covered under warranty. www.AtlantaFitnessRepair.com

Aug 24, 2009 | Exercise & Fitness

2 Answers

Treadmill will not maintain the correct speed.


You can get a book by calling 1-800-999-3756. The treadmill you are usine in a cheaper model. the motors on those units are not that strong. when you incline your unit gravity make the belt move faster. Remember incline put a lot of pressure on you lower spine. This can cause injury for some.

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