SCRUB SYSTEM 36Service Manual – Advenger, 2800ST, 3800ST, BR 755, BR 855
BRUSH MOTOR CONTROL AND LOAD CIRCUIT ERROR CODES AND MEASUREMENTS
Advenger /
BR 755, 855
Display
Error Code
ST Service
LED
Blink Code
Fault Description Troubleshooting Action
5 1, 2 Brush motor circuit overload
1. Check for binding in rotation of brushes or improper brush
lift actuator operation.
2. Check for mechanical interference of the brushes with the
side skirts.
3. Check the negative supply cable at the brush motor for a
wiring problem, improper modications, or poor connections
at the YEL/VIO sense wire.
4. Check that the deck is set correctly in the control board
programming.
10 2, 2 Brush motor K2 contactor coil overload
Check for short circuit in wiring or K2 contactor coil. Repair
or replace.
31
2, 4
Visible
in Fault
Recall Mode
Brush motor circuit open
1. Check for motor wiring open or defective motor
2. Check the negative supply cable at the brush motor for a
wiring problem or improper modications (this is a special
cable and must be replaced with original OEM due to sense
wire).
3. Check K2 contacts – if open circuit while scrub is on*,
replace K2.
4. Verify brushes are installed.
5. Verify the brushes are touching the oor and there is no
interference between the deck and the oor.
35
3, 2
Visible
in Fault
Recall Mode
Brush motor K2 contactor coil open
1. Check coil resistance (see chart below)
2. Check for tight connections at contactor and WHT/RED
wire to control board.
Repair or replace.
60 3, 4
Brush motor circuit contacts stuck closed With no power to circuit, if contacts measure 0 ohms they’re
stuck. Replace K2.
63 4, 3 Brush motor K2 contactor coil control fault
1. If J3-13 is 24V referenced to B+ when Scrub switch is Off,
replace control board.
2. If J3-13 is 0V referenced to B+ when Scrub switch is Off,
disable fault via Hidden Menu. Refer to “Control Board J1,
J2, and J3 Pin Outs and Test Points” section.
* with Scrub On, the control board at the contactor coils should measure -24V for 2 seconds, then drop to -18V when referenced to B+. The
solution solenoid when On should measure -24V or 0V referenced to B+.
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