Question about Landice L7 LTD Executive Trainer Treadmill

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When I turn on I get an overspeed error and machine shuts off. If I start it at a faster speed the speed fluctuates. I pressed start and menu and the LED says 3.5 but the diagnostic reads 6.8

Posted by Anonymous on

  • Anonymous Jun 29, 2010

    When I run a diagnostic by pushing start and menu, the speed sensor correctly reads the overspeed; That is, the LCD reads .5 but the diagnostic reads over 3mph. Is there something else, perhaps the belts, that can be adjusted?

    Thank you!



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John Mazmanian

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Your speed sensor is not working properly this part is located under the motor shroud and on top of drive motor it is attached to a bracket with 2 bolts. Unplug the unit and remove motor shroud see if you can adjust it first by loosen the 2 nuts and moving the sensor forward without making contact to the flywheel, then tightened the nuts up. Plug the unit into the outlet, start the unit, if you still have the overspeed then replacement of the sensor is needed. Call Landice Directly they will ask for model and serial number and they will the new sensor.

Posted on Jun 29, 2010

  • John Mazmanian
    John Mazmanian Jun 29, 2010

    Their might be communication problem between the upper and lower boards or the upper electronics is defective and not reading the signal pulse correctly thus causing the speed fluctuation, saying that in my experience with these units 8 out 10 times the speed sensor is the villain. Call Landice @ 1-800-526-3423 they may have a factory update that I am not aware of and most time have good insight to the problems.



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OS or O5 Error on Landice L-Series Treadmills

Probable Cause

An OS or O5 error on the Landice L-Series treadmills, such as the L7, L8 and L9, indicates an over speed condition and this occurs when the actual speed of the running belt is faster than the set speed. The possible causes for an overspeed, OS or O5, error are: A) User weight is over 200lbs, treadmill elevation is set between 10% and 15% grade and speed is set between .5 mph and 3 mph
B) User is pushing against treadmill belt causing it to go faster than the set speed
C) Defective lower board or misaligned speed sensor
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Corrective Action

A) Gravitational force will enable the user's weight to move the treadbelt faster than the set speed. The speed sensor will pick up this increase in flywheel speed and sends this information up to the display electronics. The microprocessor will then compare the actual speed to the displayed speed, determine a runaway speed condition and shut the treadmill down. An overspeed will display in the window. This is a safety feature built into all treadmills that utilize closed loop speed circuitry. The way to address an over speed condition due to gravity is have the user decrease elevation below 10% or increase the speed.

B) Similar to the gravitational force, a user can be holding onto the handrails and pushing the running belt in such a manner where they are using the treadmill like a manual machine rather than a motorized one. User needs to set speed compatible for their actual walking or jogging speed so they are not pushing the belt.

C) It's possible a blown motor control board is the problem. This occurs more frequently with PWM drives than SCR drives. However, this problem is becoming rare due to the PWM circuitry which senses this condition and shuts itself down before the drive motor receives any DC voltage at all. This means you'll get an LS or L5 error if your PWM is blown, not an OS or O5 error. This is a safety feature on all Landice home treadmills with PWM motor control boards. The SCR motor control boards also have internal protection to prevent an over speed condition from occuring due to an internal component failure. In the rarest of cases, on home treadmills, a faulty relay board can cause an OS or O5. To verify this, using a digital voltmeter, with treadmill turned on, measure the DC voltage between the V+ and P1 on the PWM board. The reading should be between 6-7 VDC. Also measure the DC voltage between P1 and P2 on the PWM board. The reading should be between 0.5 VDC and 6-7 VDC. If either of these voltages measure zero, replace the relay board.

D) Get into Open Loop Speed mode and check the speed. Adjust pots as necessary to bring up correct speed for max and min.

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