Hoshizaki JWE-620UA-6B service manual ROM/RAM Error H5, Eeprom Error H6

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h) ROM/RAM Error (H5)

•If a ROM/RAM error is detected, the unit shuts down, "H5" appears in the display, and the buzzer sounds.

•After replacing the failed component, the alarm resets.

•See the chart below for possible causes and remedies.

Code

H 5

Error

ROM/RAM on control board fails.

Item	Possible Cause

Defective.

Control Board

Operation

Unit stops.

Remedy

Replace.

i) EEPROM Error (H6)

•If an EEPROM error is detected, the unit shuts down, "H6" appears in the display, and the buzzer sounds.

•After replacing the failed component, the alarm resets.

•See the chart below for possible causes and remedies.

Code

H 6

Error

EEPROM on control board fails.

Item

Control Board

Possible Cause

Defective.

Operation

Unit stops.

Remedy

Replace.

Note: See “IV.N. Removal and Replacement of Control Board or Operation Board.”

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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 Ready Lamp Error CodesMode Lamps Auto Fill LampService Menu Access Mode ButtonSTANDBY/CLEANING Button 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 Buzzer Error CodesInternal Booster Tank Energy Saving Mode 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