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Display Codes Chart
** CAUTION **
Do not stand on
the running belt,
while performing
these steps.
NOTE: Treadmill
should be turned
off and un-
plugged from the
wall when looking
under the motor
shroud.
NOTE: Contact
STAR TRAC
Product Support
Department at
1-800-501-1221
or through our
web site at http://
www.startrac.com
Please have your
serial number
and display code
available.
STAR TRAC recommends that you refer your questions about your STAR TRAC
4000 TREADMILL operation and suspected malfunctions to STAR TRAC’s PRODUCT
SUPPORT DEPARTMENT. However, you may wish to investigate display codes that appear on
the display. You may do so by reviewing the below chart or follow the step-by-step flowcharts
for the corresponding display code.
Display Codes/Symptoms
KEY DN
• This code generally occurs when a key other than “5” or ”8” is held pressed while turning
the treadmill ON using the on/off switch.
• It may also happen if a key becomes stuck.
NO STO
• This code generally occurs when the Stop Switch is not connected tightly to the electronic
board of the Display.
• It may also happen if the circuitry associated with the switch develops a fault.
NO RPM / SP CNG
• These codes generally occur when the RPM (speed sensor) is disconnected, faulty, or
misaligned.
• They may also happen if the RPM Sensor cable is damaged.
• Motor Control Board (MCB) is misadjusted, miscalibrated. or faulty.
• Pinched or faulty Display Cable.
• Drive Motor arcing or faulty.
EL STL, EL RNG, EL LOST and EL NOZ
• These display codes generally occur when the elevation (incline) potentiometer is faulty or
out of limits.
• Elevation motor disconnected or receiving low power.
• May also happen if the MCB is miscalibrated or faulty.
• Display Cable pinched or faulty.
• Elevation Belt damaged or binding.
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