Treadmill User Manual
NAUTILUS
®
TROUBLESHOOTING
39
TROUBLESHOOTING
Troubleshooting
If you experience any operational problem with 
your treadmill, cycle the power by turning the 
circuit breaker off and then back on; this may 
eliminate the fault. 
Treadmill Data Center
The Data Center is a row of LED lights on the top 
of the motor cover that will allow you troubleshoot 
common problems on your treadmill. Below are the 
functions of the Data Center lights. 
INCLINE UP LED — This signal indication is taken 
directly from the command relay that engages the 
Incline Up motor windings. No indication during a 
commanded movement would indicate the Control 
Board is not sending the commanded voltage to the 
Incline Motor.
INCLINE DOWN LED — Similarly to the Incline Up 
LED, this signal indication is taken directly from the 
command relay that engages the Incline Down motor 
windings. Indication during a commanded movement 
would indicate the Control Board is receiving a 
command to move but without actual movement the 
Incline Motor itself may not be able to respond.
SPEED 1 — The LED fl ashes with every turn of 
the front roller, showing the front roller movement 
sensor is functioning correctly. Lack of fl ashing, 
would indicate a simple cable / sensor or 
positioning problem. 
SPEED 2 (CONTROL PWM) — The LED’s intensity 
is directly related to speed, the faster the treadmill 
is commanded to go, the brighter the LED’s output. 
For example if no intensity increase were seen 
with an increasing speed request display, it would 
indicate the Motor Control assembly is not receiving 
the speed control signal. This is not the actual motor 
drive control signal, but the console generated 
Target Speed value.
IN USE — This is a relay control signal that indicates 
that the high voltage power has been applied to the 
belt drive circuitry. Illumination of this LED indicates 
the Motor Control assembly has received the belt 
start command and is attempting to apply power to 
the switching control circuitry.
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