20 Most Recent Precor 935 Premium Series Treadmill Questions & Answers


Precor Error LS, Speed Sensor Signal Missing Probable Cause 1. Intermittent or open connection of the speed sensor (reed switch) wiring.
2. Reed switch is defective or has intermittent connection.
3. Drive motor brushes are bad.
4. Lower PCA is bad.
Corrective Action
  1. Inspect the speed sensor (reed switch) wiring for damage or poor connection to the lower PCA. Replace damaged wiring or reset connection as necessary.
  2. Using an ohm meter, test the reed switch while rotating the drive pulley. The reed switch will close when the magnet passes in front of it.
  3. Inspect the drive motor brushes and replace if necessary.
  4. Test unit with a known good lower PCA. Replace lower PCA if nec
Precor Error Code LS

Precor 935... | Answered on Feb 11, 2015


Procedure 2.3 - Accessing the User Parameter Program

This procedure allows you to change the following settings:

• Set Measurement Units
• Enable/Disable Password
• Set User Name

Procedure

1. Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
2. Press keys STOP,5,6,7,1 sequentially.
3. The display will momentarily read SELECT UNITS
4. The currently selected measurement unit will then be displayed.
5. Use the UP, DOWN arrow keys to toggle between U.S. STANDARD and METRIC.
6. Press the ENTER key to select the currently displayed measurement unit.
7. The display will momentarily read, PASSWORD
8. Use the UP, DOWN arrow keys to select either PASSWORD ENABLED or PASSWORD DISABLED
9. Press the STOP or ENTER key to exit the program.

Precor 935... | Answered on Jan 14, 2015


Is it on an extension cord? Take it off any extension cords and make sure it's on a dedicated 120v circuit. No other items on the circuit. Also, how old is it? Precor made a bunch of the 9.3x series from 2002-2005 with an aluminum tail roller that can cause problems. Check the back roller. Is is silver and non-magnetic? if that's the case, you have an aluminum roller and you need to contact precor. If you're the original owner of the machine, they should warranty the replacement of the parts, if not, you'll have to buy at the very least a running belt and new roller.

Precor 935... | Answered on Dec 02, 2014


Procedure 2.3 - Accessing the User Parameter Program
This procedure allows you to change the following settings:

• Set Measurement Units
• Enable/Disable Password
• Set User Name

Procedure

1. Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
2. Press keys STOP,5,6,7,1 sequentially.
3. The display will momentarily read SELECT UNITS
4. The currently selected measurement unit will then be displayed.
5. Use the UP, DOWN arrow keys to toggle between U.S. STANDARD and METRIC.
6. Press the ENTER key to select the currently displayed measurement unit.
7. The display will momentarily read, PASSWORD
8. Use the UP, DOWN arrow keys to select either PASSWORD ENABLED or PASSWORD DISABLED
9. Press the STOP or ENTER key to exit the program.

Precor 935... | Answered on Nov 07, 2014


Precor Error 05, Key Depressed at Power Up Probable Cause 1. A key is permanently depressed on the display.
2. An interface chip (IC) has failed in the upper PCA's keypad.
3. Liquid (cleaning solution or sweat) may be on the surface of a touch sensitive display.
Corrective Action
  1. Disconnect the keypad cable from the upper PCA. Reset power to the machine. If the Error 05 is eliminated, the keypad is the cause and should be replaced.
  2. Disconnect the keypad cable from the upper PCA. Reset power to the machine. If the Error 05 still appears, the upper PCA* is the cause and should be replaced. *Upper PCA's most commonly do not come with software. Remove the software (chip) from the existing upper PCA prior to replacement and install into the new upper PCA.
  3. Wipe away all liquid from the touch sensitive display. Reset power to the unit. If the Error 05 is eliminated, the liquid was the cause.
Precor Error Code 05

Precor 935... | Answered on Aug 29, 2014


Precor Error 05, Key Depressed at Power Up Probable Cause 1. A key is permanently depressed on the display.
2. An interface chip (IC) has failed in the upper PCA's keypad.
3. Liquid (cleaning solution or sweat) may be on the surface of a touch sensitive display.
Corrective Action
  1. Disconnect the keypad cable from the upper PCA. Reset power to the machine. If the Error 05 is eliminated, the keypad is the cause and should be replaced.
  2. Disconnect the keypad cable from the upper PCA. Reset power to the machine. If the Error 05 still appears, the upper PCA* is the cause and should be replaced. *Upper PCA's most commonly do not come with software. Remove the software (chip) from the existing upper PCA prior to replacement and install into the new upper PCA.
  3. Wipe away all liquid from the touch sensitive display. Reset power to the unit. If the Error 05 is eliminated, the liquid was the cause.
Precor Error Code 05

Precor 935... | Answered on Aug 13, 2014


If you have a known good speed sensor (reed switch) and you have tested it with an ohm meter (even new ones can be bad although not likely) all that is left is a motor brush issue or a bad upca. Pull the motor brushes and see if they still have life in them. Most brushes have lines formed in the sides to show where they need to be longer than to be acceptable. check the commutator and make sure it is clean as well. Use a stone to clean it if necessary. If all this checks out then you are looking at a bad upca.

Precor 935... | Answered on Apr 03, 2014


reset the machine make this: God bless you
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

Precor 935... | Answered on Nov 29, 2013


Hello,

Power issues with treadmills fit into two categories: the power does not turn on or the power shuts off when using the treadmill. If the power will not turn on, make sure that the treadmill is plugged into a working power outlet. In addition, you should use a single-outlet surge protector for the treadmill. Single-outlet surge protectors protect the machine from any voltage changes that may occur in your home.

If the machine is plugged into a working outlet, make sure the safety key is in the keyhole on the console. If the safety key is not plugged into the machine or if it is pulled out during operation, the treadmill will not operate.

Finally, make sure the circuit breaker located on the frame near the power cord is set to "Reset." The circuit breaker is set to "Reset" if the top of the button is pushed in. When the breaker is tripped, push it back to the "Reset" position and wait five minutes before powering on the treadmill.

If the treadmill shuts off during operation, check the power cord and circuit breaker as described above. You can also try removing and reinserting the safety key.
Take care.

Precor 935... | Answered on Mar 18, 2013


hi
it is moving error
please check motor brushes

Precor 935... | Answered on Nov 23, 2010


Hi,

Kindly provide few more details :-

1. If you run it at a lower speed, have you ever noticed an issue with the machine?
2. Is it an intermittent or eveytime you increase the speed to above 5 mph, it would stop?

Let me know,so that we could proceed.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Precor 935... | Answered on Nov 15, 2010


Error 22 indicates that the drive motor (running belt) has been instructed to start, by either manual or program control, and the monitoring system has not received any response from the speed sensing system indicating that the drive motor has started.
Error 23 indicates that the speed sensor signal was lost while the treadmill was in operation
Error 26 this error monitors the speed sensor signal and verifies the the speed sensor signal is appropriate for the requested speed. If the speed sensor signal is incorrect or erratic an Error 26 will be displayed.
Unplug unit and remove motor shroud and try these procedures:
The treadmill utilizes an optical (infrared) speed sensor and the line of sight between the speed sensor and the speed sensor target is obstructed. The speed sensor position relative to the speed sensor target is incorrect. The speed sensor potentiometer adjustment is incorrect (when equipped). The speed sensor target is damaged
Carefully, vacuum out the drive motor compartment with a static safe vacuum cleaner. Pay special attention to the area between the speed sensor and speed sensor target. Adjust the speed sensor position so that the space between the speed sensor and the speed sensor target is 3/16 inch and so that the speed sensor photo eye is aimed at the larger portion of the targets wedge shaped section. On hall effect speed sensors (magnetic sensor) the space between the end of the speed sensor and the flywheel tooth should be 3/16 inch. If the treadmill utilizes a speed sensor potentiometer, locate the speed sensor potentiometer on the lower PCA. Set the speed sensor potentiometer at mid-range. Start the treadmill and increase the speed to 6 mile per hour. Carefully adjust the speed sensor potentiometer to the point where the treadmill is operating the smoothest. Increase the treadmills speed to full speed at repeat the previous adjustment. These two adjustments are typically small and are usually only a matter of fine tuning. . Most speed sensor targets consist of a circular arrangement of alternate black and silver sections. If the speed sensor target is torn or badly scratched the speed sensor may receive an incorrect reading. Replace the speed sensor target.

Precor 935... | Answered on Jun 27, 2010


Are you sure the PSU is functioning? Check it with a multimeter set for DC Voltage. Compare what it is putting out to what the factory specs are.

Precor Exercise... | Answered on Mar 23, 2019

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