Control System 50Service Manual – SC6500
™
Display
Code
Error/Fault Description Correction
27
Right brush motor contactor coil
short to ground
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.
28
Scrub deck actuator open 1. Check for disconnected lift actuator wiring.
2. Check for an open circuit in the motor wiring or for a
defective motor.
3. Check for output voltage from the A2 control board
assembly at the actuator wiring plug. It should be 36
volts. If 0 Volts, check the A2 control board assembly.
29
Vacuum motor open 1. Check for disconnected vacuum motor wiring.
2. Check for an open circuit in the vacuum motor wiring
or for a defective motor.
3. Check for 36 Volts at the vacuum motor. If 0 Volts,
replace the vacuum motor contactor K1.
30
Vacuum motor contactor coil open 1. Check for an open circuit in the K1 coil and wiring
(wire colors VIO and BLU).
2. Test for 36V at the K1 coil. If 0 Volts, check the A2
control board assembly.
31
K1 Vacuum motor contactor coil
short to ground
1. Disconnect the K1 coil wiring (wire colors VIO and
BLU) and check to see if the code disappears.
− If the code disappears, replace the motor 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.
32
Squeegee actuator open 1. Check for disconnected squeegee actuator motor
wiring or plug connection.
2. Check for an open circuit in actuator motor wiring
(WHT/GRN and BLU/BRN) or for a defective motor
M3.
3. Check for 36 Volts at the actuator motor. If 0 Volts,
check the A2 control board assembly.
33
L1 Solution solenoid open 1. Check for an open circuit in the L1 coil and wiring
(wire colors VIO and YEL/GRN).
2. Test for 36V at the L1 coil. If 0 Volts, check the A2
control board assembly.
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