It is recommended to conduct this sequence check in the auto fill cycle after draining the wash tank and internal booster tank. See “II.B. Sequence of Operation” for further details.
1)Move the power switch (GFCI) to the “OFF” position.
2)Pull out the overflow pipe to drain the wash tank.
3)Drain the internal booster tank through the drain hose.
4)Replace the overflow pipe and drain hose in their correct positions.
5)Enter the switch open/closed display mode according to the above procedure.
6)Auto Fill Cycle
a.When the door is closed and the door switch closes, segment B in the display comes on, and the inlet water valve opens to start water supply.
b.After a while, the internal booster tank water level float switch closes, segment C in the display comes on, and the inlet water valve closes to stop water supply.
c.The rinse pump starts to feed water to the wash tank. When the internal booster tank water level goes down, the water level float switch opens, segment C in the display goes off, and the inlet water valve opens to start water supply.
d.After the rinse pump is energized for a preset number of times to fill the wash tank, the wash tank water level sensor closes, and segment D in the display comes on.
e.In normal operation, the internal booster tank backup water level float switch does not close, and segment A in the display stays off. If the internal booster tank water level float switch fails or the internal booster tank water level reaches the overflow level, segment A comes on.
7)Wash Cycle
a.When the door is opened and closed again and the door switch closes, the wash pump starts the wash cycle for a preset time. Segments B and D in the display stay on.
b.If the internal booster tank is below the predetermined water level, segment C in the display stays off. The inlet water valve stays open until segment C comes on.
c.When the wash cycle ends and the rinse cycle starts, the internal booster tank water level goes down, and segment C in the display goes off. The inlet water valve stays open until segment C comes on.
Diagnosis: If any problem is found by the above sequence check, refer to “III.B. Error Codes,” “III.C. Service Flow Charts,” “D. Float Switch Check and Cleaning” and “E. Thermistor Check.”
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