Control System
47
Service Manual – SC6500
™
Error Codes
Display
Code
Error/Fault Description
Correction
01
Scrub deck sense R2 resistor fault
A fault will occur if scrub deck sensor resistor is
unplugged or damaged. Check the resistor wiring for an
open and substitute a new resistor and test scrub deck
for correct operation. Note that there are four different
resistor values used on the different deck types. See the
electrical diagram decal for the correct specification for
the resistor to replace.
03
Speed control fault
Observe the blue flashing light detergent indicator light,
then refer to the
Wheel Drive, Traction
section to
troubleshoot the drive system.
04
Scrub motor overload
Note that some models use one, two
or three scrub motors. Refer to the
Specifications
section for detailed
load current values for the different
decks.
1. Check for binding in the rotation of the brushes and
incorrect brush deck lift actuator operation.
2. Check the negative supply cable at the brush motor
for a wiring problem, and also the small BRN current
sense wire in the harness and A2 pin J2-2.
3. Check for a short circuit* in the brush motor or wiring.
On cylindrical models check for excessive belt tension
and the condition of the idler bearing.
05
Left brush motor contactor coil
overload
Contactor
K4
is for the left motor on
the three-motor decks. The nominal
coil resistance is 94 ohms for all
three motor contactors.
1. Check for a
K4
coil wiring problem or a short circuit*
(wire colors VIO and GRA/RED).
2. Check the coil resistance. If the resistance is below
75 ohms, replace the coil.
06
Center brush motor contactor coil
overload
Contactor
K3
is for the center motor
on three-motor decks.
K3
is for the
left motor on two-motor decks.
1. Check for a
K3
coil wiring problem or a short circuit*
(wire colors VIO and WHT/VIO).
2. Check the coil resistance. If the resistance is below
75 ohms, replace the coil.
07
Right brush motor contactor coil
overload
Contactor
K2
is for the right motor
on two- or three-motor decks.
K2
is
the only contactor on a single-motor
decks.
1. Check for a
K2
coil wiring problem or a short circuit*
(wire colors VIO & YEL/BLU).
2. Check the coil resistance. If the resistance is below
75 ohms, replace the coil.
08
Scrub deck actuator overload
• Normal current load is 1-3 amps.
• Max current load is 6 amps.
• Max current with no load is 1.4
amps.
1. Check for binding or a frozen brush lift linkage and
excessive weight on the brush deck.
2. Check for a short circuit* in the actuator motor and
wiring. Repair or replace.
To test the actuator, disconnect the motor plug and
attach the actuator power cord adapter (p/n 56407502)
and perform an amp draw test. Compare readings to the
current load specifications.