Recovery System 96Service Manual – SC6500
™
Troubleshooting
If water ows around the ends of the squeegee tool instead of being pulled into the tool, the vacuum system
is not working correctly. This is usually due to either vacuum leaks, or restrictions in the squeegee tool,
vacuum hoses or oat cage.
Problem Cause Correction
Poor water pickup * Vacuum leak(s) due to:
• Leaky drain hose cap
• Leaky hose
• Bad gasket
• Damaged tank
• Check the drain hose cap and tighten/replace as
necessary.
• Check the squeegee and recovery tank hoses and
tighten/replace as necessary.
• Check the gaskets and replace as necessary.
• Check the recovery tank for damage.
Restrictions due to built-up
debris in the squeegee tool,
vacuum hoses or oat cage
1. Check the squeegee tool, vacuum hoses and oat
cage for any accumulated dirt or debris and clean
as necessary.
2. Check the vacuum system airow pathway
wherever the airow is forced to make a sharp
turn for any accumulated dirt or debris and clean
as necessary.
Vacuum motor(s)
will not run.
Vacuum motor overload
(error code
09 displayed)
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.
Vacuum motor contactor
coil overload (error code
10
displayed)
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.
Vacuum motor open (error
code
29 displayed)
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.
Vacuum motor contactor
coil open (error code
30
displayed)
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.
K1 Vacuum motor contactor
coil short to ground (error
code 31 displayed)
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.
* A vacuum leak below the waterline will create turbulence in the recovery tank, causing water to enter the
vacuum motor(s).
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