Hoshizaki JWE-620UA-6B service manual

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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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Contents Model JWE-620UA-6B Hoshizaki AMERICA, INC Contents Page Important Safety Information Specifications Specification Sheet DisplayNameplate Rating Dimensions/Connections II. General Information A. Construction DishwasherInternal Booster Tank Control Box Auxiliary Code U-1, U-2, U-3, V-0, A-0Auxiliary Code A-1 and Later Auto Fill lamp flashing and RINSE, STANDARD, or Long lamp on Sequence of OperationAuto Fill Cycle Wash Cycle STANDBY/CLEANING Button Start Rinse CycleRinse lamp flashing DrainSequence of Operation Flow Chart Auxiliary Code A-1 and Later Control Board and Operation Board Control Board LocationControl Board Layout CN5Control Board Diagram CN9X10 Error Codes Mode LampsReady Lamp Auto Fill LampMode Button STANDBY/CLEANING ButtonService Menu Access Standby LampService Menu Chart Auxiliary Code U-1, U-2, U-3, V-0, A-0 DefaultService Menu Chart Auxiliary Code A-1 and Later Temperature Display Error Codes Internal Booster Tank Energy Saving ModeBuzzer Special ModesAlert Function Auxiliary Code A-1 and Later Continuous Wash ModeConsecutive Rinse Mode OFF Switch Open/Closed Display Mode III. Service DiagnosisDiagnostic Procedure Page Error Codes Error Code TableError Code Log Error Code Details Auto Fill Error A1Internal Booster Tank Auto Fill Error A2 Wash Tank Water Level Error A3 Defective Replace Control Board Repair or replace Replace Wash Tank Thermistor Error H1, H2 Internal Booster Tank Thermistor Error H3, H4 ROM/RAM Error H5 Eeprom Error H6Phase Reversal Error H7 Service Flow Charts Unit Will Not StartPage Dishes Not Clean Page Inadequate Rinse Dishwasher Will Not Start When Door Closed No or Inadequate Detergent/Rinse Aid Supply Wash Tank Water BoilsWash Tank Water Not Draining Float Switch Cleaning Float Switch Check and CleaningFloat Switch Check Thermistor Check Removal of Panels IV. Removal and Replacement of ComponentsAccessing the Control Box Page Removal and Replacement of Internal Booster Tank Removal and Replacement of Wash Pump Motor Removal and Replacement of Rinse Pump Motor Removal and Replacement of Handle Removal and Replacement of Door Removal and Replacement of Spring Unit Removal and Replacement of SpringAdjustment of Door Opening/Closing Force Removal and Replacement of Flush Pipe Packing Installation Instructions Removal and Replacement of Thermistor Operation Board Removal and Replacement of Control Board or Operation BoardControl Board Page Cleaning and Maintenance Instructions Daily Maintenance Pump Filter Water Level Sensor Location Front Self-Cleaning Weekly Maintenance Monthly InspectionDescaling As Required Shutdown Long Storage, Relocation, Disposal, Transfer VI. Operating Instructions VII. Technical Information Water Circuit Wiring Diagram Auxiliary Code U-1, U-2, U-3, V-0, A-0Auxiliary Code A-1 and Later