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Diagnostic Guide
Error Codes
LS or L5- Loss of signal. See Flowchart for LS pages 55,56,62,63
OS or O5- An OS or 05 error indicates a treadmill Over Speed condition. This occurs when the actual
treadbelt speed is faster than the desired selected speed. There is a potential for this to occur under
the following circumstances:
1. User weight is over 200 lbs., treadmill elevation is set between 10% and 15% grade, and selected
speed is set between .5mph and 3.0mph.
2. If user pushes against treadbelt causing it to go faster than speed set.
3. Defective MCB or misaligned speed sensor.
Gravitational force will enable the user’s weight to move the treadbelt faster. The speed sensor will
pick up this increase in flywheel speed and send this up to the display board electronics. The
microprocessor will then compare the actual speed to the displayed speed, determine a runaway
speed condition and shut the treadmill down. An OS or 05 will be displayed in the two-digit selectable
display window. This is a safety feature built into all treadmills that utilize our closed loop speed
circuitry (ALL current production treadmills).
The only way to remedy an over speed condition due to gravity is to have the user decrease the
treadmill elevation under 10% grade or increase the speed.
If user is holding onto handrails and pushing the Treadbelt (using it like a manual treadmill rather than
a motorized one) it will cause an O5 error. Solution: Don’t push on the Treadbelt.
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 05 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 occurring due to an
internal component failure.
An over speed (OS or 05) can also be caused by a speed pot that’s out of adjustment.
Go into OLS testing mode and check speed. Adjust pots as necessary.
PO- Elevation Potentiometer is out of range. See Flowchart for PO
The following codes apply only to mills with SCR Control boards (LTD and CLUB treadmills)
CE- Communication Error resulting from upper/lower board failure or harness connection problem.