Control System
48
Service Manual – SC6500
™
Display
Code
Error/Fault Description
Correction
09
Vacuum motor overload
Normal current load for one motor is
16-20 amps. Normal current load for
two motors is 32-40 amps.
1. Check for debris in the vacuum motor(s).
2. Check for worn carbon brushes - replace brushes.
3. Defective motor bearings - repair or replace.
4. Check for a short circuit* in the vacuum motor or
wiring - repair or replace.
10
K1
Vacuum motor contactor
coil overload. The nominal coil
resistance is 100 ohms.
1. Check for a
K1
coil wiring problem or short circuit*
(wire colors VIO and BLU).
2. Check the coil resistance. If the coil resistance is
below 80 ohms, replace the coil.
11
Squeegee actuator overload
• Normal current load is 1-2 amps.
• Max current load is 6 amps.
• Max current with no load is 1.4
amps.
1. Check for binding or frozen squeegee lift linkage and
excessive weight on the squeegee mount.
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.
12
L1
Solution solenoid overload
The nominal coil resistance is 74
ohms.
1. Check for a wiring problem or short circuit*.
2. Check the coil resistance. Replace the solution
solenoid if the coil resistance is lower than 58 ohms.
13
Solution control pump overload
• The normal current load is 0.8-1.8
amps.
• A current load of 3.2 amps or over
will generate code 13 pump motor
overload.
1. Check for short circuits* in the wiring and in the
M12
pump motor.
2. Disconnect the solution pump motor and run the
machine to see if the wiring is shorted.
3. Check the current draw and compare to the
specifications. If the motor shows high current draw
replace the motor.
16
K6
Side broom motor contactor coil
overload
The nominal coil resistance is 100
ohms.
1. Check for a
K6
coil wiring problem or short circuit*
(wire colors VIO and BRN/BLK).
2. Check the coil resistance. If the resistance is below
80 ohms, replace the contactor.
17
Side broom actuator overload
• Normal current load is 1-2 amps.
• Max current load is 6 amps.
• Max current with no load is 1.4
amps.
1. Check for binding or frozen side broom lift linkage and
excessive weight on the lifting arms.
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.
18
K5
Auxiliary contactor coil overload
The nominal coil resistance is 100
ohms.
1. Check for a
K5
coil wiring problem or short circuit*
(wire colors YEL/BRN & BLK/ORN).
2. Check the coil resistance. If the resistance is below
80 ohms, replace the contactor.