Hoshizaki JWE-620UA-6B service manual Wash Tank Thermistor Error H1, H2

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f) Wash Tank Thermistor Error (H1, H2)

•If the wash tank thermistor senses a temperature at or above 231°F (111°C) (2.4kΩ), the thermistor leads are considered shorted and the wash tank heaters de-energize, "H1" appears in the display, and the buzzer sounds.

•If the wash tank thermistor senses a temperature at or below -6°F (-21°C) (517kΩ), the thermistor leads are considered open and the wash tank heaters de-energize, "H2" 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. Note: When this error occurs, the auto ﬁll cycle will not start.

Code

H 1 / H 2

Error

Thermistor senses abnormal temperature.

Item		Possible Cause

Thermistor		Connector not properly
		connected.
		connected.

Operation

Continues (wash tank

heater off).

Remedy

Reconnect.

Open circuit (H2).

Replace.

Short circuit (H1).

Replace.

Defective.

Replace.

Control Board

Connector not properly connected.

Reconnect.

Defective.

Replace.

Note: See “III.E. Thermistor Check” and “IV.M. Removal and Replacement of Thermistor.”

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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 Cycle Sequence of OperationAuto 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 ModesConsecutive Rinse Mode Continuous Wash ModeAlert Function Auxiliary Code A-1 and Later OFF Diagnostic Procedure III. Service DiagnosisSwitch 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 Float Switch Check and CleaningFloat Switch Cleaning Thermistor Check Accessing the Control Box IV. Removal and Replacement of ComponentsRemoval 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 Control Board Removal and Replacement of Control Board or Operation 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