Hoshizaki JWE-620UA-6B service manual Descaling As Required

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Recommendation of safety inspection by service personnel

Even if there is no problem with its use, a product out of warranty may have a risk of electric shock, fire, or water leak due to insulation degradation or aging of the electrical parts. Ask an authorized Hoshizaki service company for the following inspections (charged):

Dust and dirt build-up or water leak inside the unit

Aging conditions of the unit and its components

Scale, silica, lime or other foreign matter in the water circuit

E. Descaling (As Required)

Use a descaler according to the supplier’s instructions.

WARNING

1.Carefully follow any instructions provided with the descaler.

2.Always wear liquid-proof gloves and goggles to prevent the descaler from coming into contact with skin or eyes.

3.To prevent generation of toxic chlorine gas, do not mix a descaler with a chlorinated cleaner.

1)Pull out the drain pipe to drain water from the wash tank. Start the auto fill cycle to fill the wash tank with hot water.

2)Use the “ON/OFF” button to turn off the unit. Refer to the descaler's directions and add the proper amount of descaler to the wash tank. The wash tank holds 14.3 gallons of water.

3)Keep the door open. Press and hold the up and down buttons and the “MODE” button, then press the “ON/OFF” button to select the “PC” (Preventative Cleaning) mode.

4)Close the door to start preventative cleaning.

5)Refer to the descaler's directions for the proper duration of cleaning. When the proper amount of time has passed, press the “ON/OFF” button to stop cleaning.

6)Open the door, then check the wash tank interior. Repeat steps 1) through 5) if necessary.

WARNING

Be careful not to burn yourself with the hot water or parts in the wash tank.

7)Drain the wash tank, then start the auto fill cycle. Run the dishwasher to rinse the wash tank thoroughly. Drain the wash tank.

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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 Sequence of Operation Auto Fill CycleAuto Fill lamp flashing and RINSE, STANDARD, or Long lamp on 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 ModesContinuous Wash Mode Consecutive Rinse ModeAlert Function Auxiliary Code A-1 and Later OFF III. Service Diagnosis Diagnostic ProcedureSwitch Open/Closed Display Mode 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 Check and Cleaning Float Switch CheckFloat Switch Cleaning Thermistor Check IV. Removal and Replacement of Components Accessing the Control BoxRemoval of Panels 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 Removal and Replacement of Control Board or Operation Board Control BoardOperation 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