171Service Manual – SC5000 30 - Solution System
Troubleshooting
Detergent Not Flowing
1. Verify that the pickup tube in the
detergent bottle is below the liquid level
of detergent, and is not blocked.
2. Check the detergent tubing for cuts,
damage, or loose connections, especially
on the suction-side between the pump
and bottle.
• A leak on the pressure-side of the
pump will likely show drips or
detergent residue, but a leak on the
suction-side won’t show any outward
signs.
3. Disconnect the outlet tube from the
detergent pump.
4. Start the machine with Service Mode access, and navigate to the
Service Menu, Output Test, Detergent Pump output.
5. Press the Left arrow to enter the detergent pump screen.
6. Press the up and down arrows to cycle through the 3 options of
Off, Low, and High. Select High.
• You should be able to hear and/or feel the solenoid cycling
approximately every second. If you hear the solenoid cycling, but no uid is exiting the outlet, then
the pump’s diaphragm is broken and the pump needs to be replaced.
• If you do not feel/hear the solenoid cycling, continue below with a voltage check at the pump.
7. Manually operate the pump from the service menu in Low speed.
8. Place a voltmeter across the positive and negative terminals of the solenoid. (An analog voltmeter will
be easier to read the short pulses.)
• If voltage pulses are detected but the solenoid is not cycling, then replace the solenoid.
• If no voltage pulses are detected, continue below to check the connections directly at the MMC.
9. Place the voltmeter probes between J1-4 and J1-5 at the MMC.
• If voltage pulses are detected, repair or replace the wiring between the MMC and the detergent
pump.
• If no voltage pulses are detected, replace the Main Machine Controller.
Outlet
Inlet
Pos
Neg
Diaphragm
Solenoid
Output Test
DET PUMP
Back
Set
RIGHT BRUSH
LEFT BRUSH
VACUUM 1
Off
Off
Off
Off
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