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Hoshizaki JWE-620UA-6B Service Manual

Hoshizaki dishwasher user manual
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Download this manual See also: Instruction Manual, Installation Manual
MODEL
HOSHIZAKI
DISHWASHER
JWE-620UA-6B
SERVICE MANUAL
NO.
80VC-782
ISSUED:
OCT. 20, 2009
REVISED: SEP. 6, 2011

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Summary of Contents for Hoshizaki JWE-620UA-6B

  • Page 1 DISHWASHER MODEL SERVICE MANUAL HOSHIZAKI JWE-620UA-6B 80VC-782 ISSUED: OCT. 20, 2009 REVISED: SEP. 6, 2011...
  • Page 2 Hoshizaki provides this manual primarily to assist qualifi ed service technicians in the maintenance and service of the unit. Should the reader have any questions or concerns which have not been satisfactorily addressed, please call, write, or send an e-mail message to the Hoshizaki Technical Support Department for assistance.

  • Page 3: Table Of Contents

    B. Nameplate Rating --------------------------------------------------------------------------------------- 2 C. Dimensions/Connections ------------------------------------------------------------------------------ 3 II. General Information ---------------------------------------------------------------------------------------- 4 A. Construction ---------------------------------------------------------------------------------------------- 4 1. Dishwasher -------------------------------------------------------------------------------------------- 4 2. Internal Booster Tank ------------------------------------------------------------------------------- 5 3. Control Box -------------------------------------------------------------------------------------------- 6 B. Sequence of Operation -------------------------------------------------------------------------------- 8 1. Auto Fill Cycle ----------------------------------------------------------------------------------------- 8 2.
  • Page 4 3. Inadequate Rinse -----------------------------------------------------------------------------------44 4. Dishwasher Will Not Start When Door Closed ----------------------------------------------45 5. No or Inadequate Detergent/Rinse Aid Supply ----------------------------------------------46 6. Wash Tank Water Boils ----------------------------------------------------------------------------46 7. Wash Tank Water Not Draining ------------------------------------------------------------------47 D. Float Switch Check and Cleaning ------------------------------------------------------------------48 1.
  • Page 5 Important Safety Information Throughout this manual, notices appear to bring your attention to situations which could result in death, serious injury, or damage to the unit. WARNING Indicates a hazardous situation which could result in death or serious injury. NOTICE Indicates a situation which could result in damage to the unit or property.

  • Page 6: Specifi Cations

    I. Specifi cations A. Specifi cation Sheet AC SUPPLY VOLTAGE POWER SUPPLY CAPACITY AMPERAGE STARTING AMPERAGE ELECTRICAL CONSUMPTION HEATER RACK SIZE NUMBER OF LARGE DISHES / RACK CYCLE TIME WATER CONSUMPTION OUTSIDE DIMENSIONS EXTERIOR DOOR WASH SYSTEM RINSE SYSTEM PUMP DRAIN SYSTEM START DRY SYSTEM...

  • Page 7: Nameplate Rating

    B. Nameplate Rating For certifi cation marks, see the nameplate on the dishwasher. We reserve the right to make changes in specifi cations and design without prior notice.

  • Page 8: Dimensions/Connections

    C. Dimensions/Connections...

  • Page 9: General Information

    II. General Information A. Construction 1. Dishwasher...

  • Page 10: Internal Booster Tank

    2. Internal Booster Tank Legend: F/S–fl oat switch; H–heater; TH–thermistor...

  • Page 11: Control Box

    3. Control Box a) Auxiliary Code U-1, U-2, U-3, V-0, A-0 Top View Air Flow Motor Fan motor is attached to the base Ground Fault Circuit Interrupter Wash Tank Heater Control Rinse PM Control Side View Wash PM Control Internal Booster Tank Heater Control Legend: CB–control board;...
  • Page 12 b) Auxiliary Code A-1 and Later Legend: CB–control board; GFCI–ground fault circuit interrupter; MC–magnetic contactor; PM–pump motor; RX–phase reversal relay; TR–transformer; X–relay...

  • Page 13: Sequence Of Operation

    B. Sequence of Operation The steps in the sequence are as outlined below. 1. Auto Fill Cycle a) Auxiliary Code U-1, U-2, U-3, V-0, A-0 “AUTO FILL” lamp fl ashing and “RINSE,” “STANDARD,” or “LONG” lamp on. If WT WLS is open when power is supplied and the “ON/OFF” button is pressed, the “AUTO FILL”...

  • Page 14: Ready Cycle (Unit Inactive)

    on. If WT WLS is open, BZ beeps continuously, the "AUTO FILL" lamp goes off and "A1" fl ashes in the display. For details, see "III.B.3.a) Auto Fill Error (A1)." Note: 1. If DS opens during the auto fi ll cycle, the "AUTO FILL" lamp goes off, and RPM de- energizes.

  • Page 15: Rinse Cycle

    "STANDBY/CLEANING" Button Start When the "READY" lamp is on, the unit starts operation in the selected mode when the "STANDBY/CLEANING" button is pressed. "STANDARD" or "LONG" lamp fl ashing (depending on the wash mode selected). WPM energizes and power is supplied to DFT for the length of time set by the wash cycle time setting.

  • Page 16: Drain

    BZ–buzzer; CB–control board; DFT–detergent feeder terminals (detergent feeder not provided by Hoshizaki); DS–door switch; RFT– rinse aid feeder terminals (rinse aid feeder not provided by Hoshizaki); RPM– rinse pump motor; WLF/S–water level float switch; WLS–water level sensor;...

  • Page 17: Sequence Of Operation Flow Chart

    C. Sequence of Operation Flow Chart a) Auxiliary Code U-1, U-2, U-3, V-0, A-0...
  • Page 18 b) Auxiliary Code A-1 and Later...

  • Page 19: Control Board And Operation Board

    D. Control Board and Operation Board • A Hoshizaki exclusive solid-state control board and operation board are employed in all Hoshizaki dishwasher units. • All models are pretested and factory set. 1. The control board and operation board are fragile; handle very carefully.

  • Page 20: Control Board Layout

    2. Control Board Layout Inputs and outputs are laid out on the control board as illustrated below. Signal Input XA Connector (6P) Signal Input XA Connector (10P) Thermistor Signal Input XA Connector (4P) Operation Board XA Connector (5P) Heater Control Signal Input XA Connector (8P) Buzzer Output XA Connector (2P) CN10...

  • Page 21: Control Board Diagram

    [Communication] Operation Panel Board (Shielded Wire) Wash Tank Thermistor Internal Booster Tank Thermistor Buzzer Output JWE-620UA-6B Pins 1-4 shorted: 3 phase control Pins 1-4 open: Booster Tank control 200V from Transformer Transformer 11V 7.7V 1 (CN1) 4 1 (CN2) 6...
  • Page 22 [Communication] Operation Panel Board (Shielded Wire) Wash Tank Thermistor Internal Booster Tank Thermistor Buzzer Output JWE-620UA-6B Pins 1-4 shorted: 3 phase control Pins 1-4 open: Booster Tank control 200V from Transformer Transformer 11V 7.7V 1 (CN1) 4 1 (CN2) 6...

  • Page 23: Operation Panel Layout

    6. Controls, Adjustments, and Lamps a) "READY" Lamp Comes on when the auto fi ll cycle completes and the dishwasher is ready to wash. b) "AUTO FILL" Lamp Flashes during the auto fi ll cycle, and goes off at the end of the cycle.

  • Page 24: Service Menu And Error Log

    Standby Lamp Comes on when the dishwasher is in the standby mode. The unit will not start even when the door is closed with this lamp on. See "II.D.6.h) "STANDBY/CLEANING" button. e) Up Button, Down Button Press to scroll through the service menu and adjust settings. Can also be used as follows: Press to display the total number of operations.
  • Page 25 b) Service Menu Chart (Auxiliary Code U-1, U-2, U-3, V-0, A-0) Service Item and Details Menu Wash Cycle Time (Standard Mode) Wash Cycle Time (Long Mode) Rinse Cycle Time Wash Temperature Setpoint Rinse Temperature Setpoint Auto Fill Cycle Wash Cycle Time Multiplier (Standard Mode) Wash Cycle Time Multiplier (Long Mode)
  • Page 26 c) Service Menu Chart (Auxiliary Code A-1 and Later) Service Item and Details Menu Wash Cycle Time (Standard Mode) Wash Cycle Time (Long Mode) Rinse Cycle Time Wash Temperature Setpoint Rinse Temperature Setpoint Auto Fill Cycle Wash Cycle Time Multiplier (Standard Mode) Wash Cycle Time Multiplier (Long Mode)

  • Page 27: Temperature Display

    Press the down button to indicate rinse (internal booster tank) water temperature instead of wash tank water temperature while the dishwasher is in "READY" mode. To change the normal temperature display to the rinse (internal booster tank) water temperature, see "Water Temperature Display"...

  • Page 28: Error Codes

    9. Error Codes In the event of operation outside of normal parameters, the control board identifi es the issue with an error code and beeps. If more than one error occurs, the display cycles through the relevant error codes. For service corrections, see "III.B. Error Codes." Wash Tank Auto Fill Error Internal Booster Tank Auto Fill Error Wash Tank Water Level Error...
  • Page 29 until the temperature is reached. If the temperature is not reached in 60 seconds, the unit goes into ready mode. This setting only applies when the energy saving mode is activated. Note: The default water temperature drop of setpoint minus 15°F (8°C) was based on test results under the following conditions: Supply Voltage: 230V Water Supply Temperature 109°F (43°C)
  • Page 30 3) Set service menu item 22 to either OFF [“Ch” goes off after 10 minutes] or ON [“Ch” keeps fl ashing] (factory default: OFF). Even if set to ON, “Ch” goes off when the “ON/OFF” button on the operation panel is switched off. 4) Set service menu item 23 to ON to stop the beep when the “ON/OFF”...

  • Page 31: Service Diagnosis

    III. Service Diagnosis 1. This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fi re. 2. Risk of electric shock. Use extreme caution and exercise safe electrical practices.
  • Page 32 It is recommended to conduct this sequence check in the auto fi ll 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 overfl...

  • Page 33: Error Codes

    B. Error Codes In the event of operation outside of normal parameters, the control board identifi es the issue with an error code. For further service information, see "III.C. Service Flow Charts." 1. Error Code Table Error Problem Code Wash Tank Auto Fill Error Water level in wash tank does not reach water level sensor after rinse pump has run preset number of cycles.

  • Page 34: Error Code Log

    Error Problem Code Internal Booster Tank Thermistor Error (open) Thermistor senses abnormal temperature (at (heater off) or below -6°F (-21°C)). ROM/RAM Error Control board ROM/RAM fails. EEPROM Error EEPROM fails. Phase Reversal Error Power supply phase is reversed. 2. Error Code Log Use the "ON/OFF"...

  • Page 35: Error Code Details

    3. Error Code Details a) Auto Fill Error (A1) • If the water level sensor in the wash tank is not closed at the end of the auto fi ll cycle, the unit shuts down, "A1" appears in the display, and the buzzer sounds. •...
  • Page 36 Continue Internal Booster Tank Water Level Float Switch Sticking (with float in Check and clean. See “ON” position). “III.D. Float Switch Check and Cleaning.” Defective (with internal Replace. contacts in “ON” position).
  • Page 37 b) Internal Booster Tank Auto Fill Error (A2) • In the auto fi ll cycle, if the internal booster tank water level fl oat switch does not close within 10 minutes after the cycle starts, the unit shuts down, "A2" appears in the display, and the buzzer sounds.
  • Page 38 c) Wash Tank Water Level Error (A3) • If the water level in the wash tank goes below the water level sensor in "READY" mode or in "STANDBY," the auto fi ll cycle starts, "A3" appears in the display, and the buzzer sounds.
  • Page 39 d) Internal Booster Tank Water Level Error 1 (Internal Booster Tank Water Level Float Switch Closed) (o1) • If both the internal booster tank water level fl oat switch and the internal booster tank backup water level fl oat switch have remained closed for 1 minute, the internal booster tank heaters de-energize, "o1"...
  • Page 40 e) Internal Booster Tank Water Level Error 2 (Internal Booster Tank Water Level Float Switch Open) (o2) • If the internal booster tank water level fl oat switch is open and the internal booster tank backup water level fl oat switch has remained closed for 1 minute, the internal booster tank heaters de-energize, "o2"...
  • Page 41 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. •...
  • Page 42 g) Internal Booster Tank Thermistor Error (H3, H4) • If the internal booster tank thermistor senses a temperature at or above 231°F (111°C) (2.4kΩ), the thermistor leads are considered shorted and the internal booster tank heaters de-energize, "H3" appears in the display, and the buzzer sounds. •...
  • Page 43 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 ROM/RAM on control board fails.
  • Page 44 j) Phase Reversal Error (H7) • If a phase reversal error is detected, the unit shuts down, "H7" appears in the display, and the buzzer sounds. • After correcting the connection, the alarm resets. • See the chart below for possible causes and remedies. Code Power supply phase is reversed.

  • Page 45: Service Flow Charts

    C. Service Flow Charts 1. Unit Will Not Start Unit will not start Problem Main Power Supply Power Switch (GFCI) ON/OFF Button Power Failure No Water Supply Door Door Switch Continue Possible Cause Off, blown fuse, or Turn on, replace, or tripped or defective check and reset.
  • Page 46 Continue Transformer Wiring to Control Board Control Board Open coil winding. Check continuity and replace. Loose connections or Check continuity and open. replace. In alarm. See “III.B. Error Codes.” Defective. Replace.

  • Page 47: Dishes Not Clean

    2. Dishes Not Clean Dishes not clean Problem Low Wash Pump Output Wash Spray Arms Filter Dish Rack Dishes Continue Possible Cause Clogged with foreign Clean. matter. Voltage drop. Remove cause. Vapor lock due to Clean tank filter. clogged tank filter. Vapor lock due to use Stop using neutral of neutral cleaner.
  • Page 48 Continue Detergent Wash Tank Water Heater Not Energized Wash Cycle Time Voltage No supply. See “III.C.5. No or Inadequate Detergent/Rinse Aid Supply.” Insufficient supply. Refill or adjust detergent feeder. Unspecified detergent Use specified used. detergent only. Dirty. Drain wash tank and supply fresh hot water.

  • Page 49: Inadequate Rinse

    3. Inadequate Rinse Inadequate rinse Problem Low Rinse Pump Output Rinse Spray Arms Dish Rack Rinse (Internal Booster Tank) Water Rinse Cycle Time Voltage Possible Cause Clogged with foreign Clean. matter. Rinse water line Clean. scaled. Voltage drop. Remove cause. Rinse pump defective.

  • Page 50: Dishwasher Will Not Start When Door Closed

    4. Dishwasher Will Not Start When Door Closed Dishwater will not start when door closed Problem Setting error Wash Pump Inoperative Rinse Pump Inoperative Door Magnet Detection Error Possible Cause Unit in “STANDBY.” Press “STANDBY/ CLEANING” button to cancel “STANDBY.”...

  • Page 51: No Or Inadequate Detergent/Rinse Aid Supply

    5. No or Inadequate Detergent/Rinse Aid Supply No or inadequate detergent/rinse aid supply Problem Detergent/Rinse Aid Supply Line (Injector, Vinyl Hose, Strainer) Detergent Pump 6. Wash Tank Water Boils Wash tank water boils Problem Thermistor Magnetic Contactor Heater Control Relay Control Board Note: See “III.E.

  • Page 52: Wash Tank Water Not Draining

    7. Wash Tank Water Not Draining Wash tank water not draining Problem Drain Hose Drain Pipe (Overflow Pipe) Possible Cause Clogged. Unclog. Pinched. Correct. Raised. Correct. Clogged. Unclog. Remedy...

  • Page 53: Float Switch Check And Cleaning

    2) Use a soft brush to remove scale or soil on the fl oat swtich, or wipe down the fl oat switch with a mixture of 1 part of recommended cleaner Hoshizaki “Scale Away” or “LIME-A-WAY” (Economics Laboratory, Inc.) and 25 parts of warm water.

  • Page 54: Thermistor Check

    E. Thermistor Check If the error code “H1” “H2” “H3” or “H4” or an abnormal temperature [above 231°F (111° C) or below -6°F (-21°C)] appears in the display, or the wash tank water boils, check the thermistor(s) according to the procedure below. If replacement is required, see “IV.M. Removal and Replacement of Thermistor.”...

  • Page 55: Removal And Replacement Of Components

    IV. Removal and Replacement of Components 1. This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fi re. 2. Move the power switch (GFCI) to the "OFF" position and turn off the power supply before servicing.
  • Page 56 * The illustration shows relay X13 provided only for Auxiliary Code A-1 and later.

  • Page 57: Removal And Replacement Of Internal Booster Tank

    C. Removal and Replacement of Internal Booster Tank 1) Move the power switch (GFCI) to the “OFF” position, then turn off the power supply. Lockout/Tagout to prevent the power from being turned back on inadvertently. 2) Close the water supply line shut-off valve. 3) Use the internal booster tank drain hose to drain the internal booster tank.

  • Page 58: Removal And Replacement Of Wash Pump Motor

    D. Removal and Replacement of Wash Pump Motor To remove: 1) Move the power switch (GFCI) to the “OFF” position, then turn off the power supply. Lockout/Tagout to prevent the power from being turned back on inadvertently. 2) Drain the wash tank. 3) Remove the front panel.

  • Page 59: Removal And Replacement Of Rinse Pump Motor

    6) Fill the tank with water, then check for water leaks from the joints. If there is a water leak, check the connections, and retighten the bands. If there are no water leaks, drain the tank. This inspection cannot detect water leaks from the fl exible pipe and pipe joint connection.

  • Page 60: Removal And Replacement Of Handle

    F. Removal and Replacement of Handle 1) Unscrew the door link shaft with the door closed. While holding the handle by hand to prevent it from springing back, remove the link arms and related parts from the shaft. Be sure to hold the handle, or it may spring back and cause injury. 2) Remove the screws securing the handle to the arms, and pull off the handle.

  • Page 61: Removal And Replacement Of Door

    G. Removal and Replacement of Door To remove: 1) Open the door. Remove the lower screws securing the roller units from inside the wash compartment, then loosen the upper screws. NOTICE! Never remove the upper screws, or the roller units will fall into the rails, and the door cannot be removed.

  • Page 62: Removal And Replacement Of Spring Unit

    H. Removal and Replacement of Spring Unit 1) Remove the handle. WARNING! To reduce the risk of injury, follow the instructions in “IV.F. Removal and Replacement of Handle.” 2) Remove the frame covers. 3) Loosen the spring unit mounting screws, and remove the operation panel. 4) Remove the spring unit mounting screws, and lift off the spring units.

  • Page 63: Adjustment Of Door Opening/Closing Force

    6) Adjust the door opening/closing force. See “IV.J. Adjustment of Door Opening/Closing Force.” J. Adjustment of Door Opening/Closing Force The door opening/closing force is easily adjustable as follows: 1) Remove the frame cover. 2) Remove the U-nut. 3) Rotate the door opening/closing force adjustment screw with a fl...

  • Page 64: Removal And Replacement Of Flush Pipe

    K. Removal and Replacement of Flush Pipe 1) Remove the rack rails, upper/lower wash and rinse spray arms, tank fi lters, overfl ow pipe, and separator. 2) Remove the rack guide. 3) Remove the band. 4) Remove the upper and lower headers. 5) Unscrew the joint to the pump discharge outlet, then remove the fl...

  • Page 65: U-Packing Installation Instructions

    L. U-Packing Installation Instructions Incorrect installation of the U-packings will cause water leaks. 1) Water Supply Pipe and Rinse Pump Connection • The pipe is under pressure inside and under atmospheric conditions outside. 2) Rinse Water Line Connection Inside Double Pipe •...

  • Page 66: Removal And Replacement Of Thermistor

    3) Header (Rinse Spray Arm) and Double Pipe Connection M. Removal and Replacement of Thermistor 1. The thermistors are fragile; handle very carefully. 2. Always use the recommended sealant (high thermal conductive type), Model KE4560RTV manufactured by SHINETSU SILICONE, Part Code 60Y000-11, or Part Code 4A0683-01 or equivalent.

  • Page 67: Removal And Replacement Of Control Board Or Operation Board

    N. Removal and Replacement of Control Board or Operation Board When replacing a control board or operation board, follow the precautions below. 1. The control board and operation board are fragile; handle very carefully. 2. The control board and operation board contain integrated circuits, which are susceptible to failure due to static discharge.
  • Page 68 Stay - OP Unit Frame Mounting Screw Joint - Operation (B) Operation Panel (B) Cable - Operation Tube (B) Connector Operation Board Tube (A)

  • Page 69: Cleaning And Maintenance Instructions

    V. Cleaning and Maintenance Instructions A. Daily Maintenance Be sure to clean the dishwasher after closing time every day. It is diffi cult to remove heavy soils left overnight. In high temperature conditions, food scraps will rot and affect sanitary operation.
  • Page 70 6) Check the pump fi lter inside the wash tank. If it is clogged, clean it with a scourer. 7) Check the water level sensor. If it is dirty, clean it with a soft brush. Water Level Sensor Location Do not use a metal brush to clean the water level sensor. The surfaces may be damaged, or metal particles attached to the sensor may cause malfunction.

  • Page 71: Self-Cleaning

    After the cycle completes, turn the detergent feeder back on. If this is not practical, consult with an authorized Hoshizaki service company. 1) Turn on the gas and water supplies and water heater. 2) Pull out the drain pipe.

  • Page 72: Weekly Maintenance

    2) Press the test switch. The power switch (GFCI) should switch from “ON” to “OFF”. 3) If not, move the power switch (GFCI) to the “OFF” position, and contact an authorized Hoshizaki service company. 2. Water Supply Line Check the water supply line for damage, deformation, or water leak marks (stains).

  • Page 73: Descaling (As Required)

    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 fi ll cycle. Run the dishwasher to rinse the wash tank thoroughly. Drain the wash tank.

  • Page 74: Shutdown

    When pulling out the drain pipe, be careful not to touch the wash water. It may cause burns or skin irritation. Turn the drain pipe if it is hard to pull out. NOTICE Water Heater Gas Supply Line Shut-off Valve Water Supply Line Shut-off Valve Water Water Supply Valve Drain Valve IMPORTANT IMPORTANT WARNING Dishwasher...

  • Page 75: Long Storage, Relocation, Disposal, Transfer

    If something seems wrong when restarting the unit after long storage, turn off the power supply, and immediately contact an authorized Hoshizaki service company. 1. When restarting the unit after long storage, contact an authorized Hoshizaki service company. To prevent electric shock, do not restart the unit by yourself.

  • Page 76: Operating Instructions

    VI. Operating Instructions Do not stack racks. Otherwise, this will cause reduction in the washing effect or failure. • Before loading dishes in the rack, be sure to remove any leftovers (ex. meat, fish, vegetables), chopsticks, toothpicks, sticks, straws, paper products and plastics from the dishes.

  • Page 77: Technical Information

    (not provided by Hoshizaki) into the wash tank. • The rinse aid is fed by the rinse aid feeder (not provided by Hoshizaki) into the rinse water line and sprayed from the upper and lower rinse spray arms into the wash compartment.

  • Page 78: Wiring Diagram

    B. Wiring Diagram 1. Auxiliary Code U-1, U-2, U-3, V-0, A-0...

  • Page 79: Auxiliary Code A-1 And Later

    2. Auxiliary Code A-1 and Later...

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