Scrub System, Disc 133Service Manual – SC6500
™
Problem Cause Correction
The scrub system
will not operate
(continued)
Left brush motor contactor
coil open (error code
22
displayed)
1. Check for an open circuit in the K4 coil and wiring
(wire colors VIO and GRA/RED)
2. Test for 36V at the K4 coil. If you get 0 Volts,
check the A2 control board assembly.
Left brush motor contactor
coil short to ground (error
code
23 displayed)
1. Disconnect the K4 coil wiring (wire colors VIO
and GRA/RED) and check to see if the code
disappears.
− If the code disappears, replace the brush
contactor.
− If the code does reappear, test the wiring for
a short back to the battery ground. Repair or
replace the defective wire.
2. If the above test doesn’t remove the code,
substitute a new A2 control board assembly.
Center brush motor
contactor coil open (error
code
24 displayed)
1. Check for an open circuit in the K3 coil and wiring
(wire colors VIO and WHT/VIO)
2. Test for 36V at the K3 coil. If you get 0 Volts,
check the A2 control board assembly.
Center brush motor
contactor coil short to
ground (error code
25
displayed)
1. Disconnect the K3 coil wiring (wire colors VIO
and WHT/VIO) and check to see if the code
disappears.
− If the code disappears, replace the brush
contactor.
− If the code does reappear, test the wiring for
a short back to the battery ground. Repair or
replace the defective wire.
2. If the above test doesn’t remove the code,
substitute a new A2 control board assembly.
Right brush motor contactor
coil open (error code
26
displayed)
1. Check for an open circuit in the K2 coil and wiring
(wire colors VIO and YEL/BLU)
2. Test for 36V at the K2 coil. If you get 0 Volts,
check the A2 control board assembly.
Right brush motor contactor
coil short to ground (error
code
27 displayed)
1. Disconnect the K2 coil wiring (wire colors VIO
and YEL/BLU) and check to see if the code
disappears.
− If the code disappears, replace the brush
contactor.
− If the code does reappear, test the wiring for
a short back to the battery ground. Repair or
replace the defective wire.
2. If the above test doesn’t remove the code,
substitute a new A2 control board assembly.
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