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III. Service Diagnosis
WARNING
1. This unit should be diagnosed and repaired only by qualified service
personnel to reduce the risk of death, electric shock, serious injury, or fi re.
2. Risk of electric shock. Use extreme caution and exercise safe electrical
practices.
3. Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.
4. Do not make any alterations to the unit. This could cause water leak, electric
shock, or fi re.
5. To help reduce the risk of electric shock, do not touch switches with damp
hands.
A. Diagnostic Procedure
The diagnostic procedure is a sequence check of the switches and sensors while operating
the unit, by using the switch open/closed display mode.
Switch Open/Closed Display Mode
The switch open/closed display mode indicates when the wash start switch, rinse start switch,
wash tank water level sensor, booster tank water level fl oat switch, and booster tank backup
water level fl oat switch are open or closed.
To enter the switch open/closed display mode, use the "ON/OFF" button to turn on the
unit. Press and hold the up and down buttons for 3 seconds. The following appears in the
display:
Load a rack to engage the wash start switch and start a cycle. The display indicates whether
a switch is open or closed. When a switch is closed, its corresponding segment is illuminated
in the display. See the illustration below.
To resume the normal display, press the down button.
Booster Tank Backup Water Level Float Switch
Wash Start Switch
Booster Tank Water Level Float Switch
Rinse Start Switch
Wash Tank Water Level Sensor