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Nautilus® Sport Series Treadmill Service Manual
Condition / Problem Things to Check Solution
8. No Power.
Power Source Check for power at outlet.
Safety Key (Magnetic) Make sure Safety Key is in place.
Treadmill Circuit Breaker
Switch
Reset or replace the circuit breaker
(check continuity on the circuit breaker).
Dual Board LED’s If the 115VAC and +12V LED are off, check
household circuit breaker. If good check
the 15 amp fuse on the Dual Board. If both
are good then replace the power cord.
If 115VAC light is on and 12V
light is off
Replace Dual Board.
If both 115VAC and 12V lights
are on
Insert Safety Key. If LED’s flash, replace
the upper electronics
9. No belt movement with
elevation.
Signal to Dual Board Check the following LED lights and make
sure they are lit in the Dual Board:
1 - DT6/MC PWM
2 - DT9/Motor Power
3 - ILT4/Arm Volt
If the DT6/PWM LED is not lit, then you
will need to check Yellow wire seating in
6-pin I/O plugs and check VDC between
Blue and Yellow wires. If reading 12
VDC+ then replace LCB. If not, replace
Upper Electronics. If the MC/Sig LED is lit
and the other 2 are not, you will need to
replace the Dual Board.
If all 3 of the LED’s are not lit then you
will change 1) the I/O cables, 2) the upper
Electronic Board.
If all 3 LED’s are lit, then check for DC
voltage at the A1 & A2 posts. If you are
getting DC voltage then change the Motor,
if not then change the Dual Board.
10. Fuses continue to blow or
circuit breaker switch trips.
Running Belt Check the lubrication between the belt
and deck. If the lubrication is good, then
check the condition of the deck surface
and the surface on the underneath side
of the belt. Also check the tension of the
walking belt.
11. Console powers up, No belt
movement, No elevation.
I/O Cable Connectors Check I/O cables.
ELECTRICAL AND MECHANICAL TROUBLESHOOTING GUIDE