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Hoshizaki JWE-620UA-6B, Service Manual

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Hoshizaki JWE-620UA-6B Service Manual Download Page 35

30

g) Internal Booster Tank Thermistor Error (H3, H4)

Z("                  F@6a J666a4K

JF=žK      
de-energize, "H3" appears in the display, and the buzzer sounds.

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the thermistor leads are considered open and the internal booster tank heaters de-energize, 
"H4" appears in the display, and the buzzer sounds.

Z*" "  
Z !"  
 HW !

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

Control Board 

Defective. 

Replace.

Thermistor

Connector not properly 
connected.

Reconnect.

Open circuit (H4). 

Replace.

Thermistor senses abnormal temperature. 

H 3 / H 4 

Code Error 

Item Possible 

Cause 

Remedy 

Continues (internal 

booster tank heater off).

Operation 

Short circuit (H3). 

Replace.

Defective. 

Replace.

Connector not properly 
connected.

Reconnect.

Summary of Contents for JWE-620UA-6B

Page 1: ...SERVICE MANUAL HOSHIZAKI DISHWASHER JWE 620UA 6B NO 80VC 782 ISSUED OCT 20 2009 REVISED MAR 11 2010 MODEL...

Page 2: ...IMPORTANT 3 4 4 56 4 BF5G H H 6 BB F 6G B J BK F 6 LH 6 BB 6BP5 J BK 5B H Q W H H L X Y H Z Z Z 4 L...

Page 3: ...IMPORTANT 3 CONTENTS 1 1 3 F 4 X4 4 6 F P 4 L 6 6 4 F 3 4 JY K W 4 8 3 4 G P 6B 4 4 11 4 6F 6 4 6F F 4 6 4 6 6P P 6P 5 4 6P 16 18 G 4 18 6B 18 66 6G FB FB 4 FF 6 4 FF F 4 F 4 F 4 4 6 Y W F 4 P i...

Page 4: ...4 4 6 6 4 6 F 4 6 4 F _ 3 3 4 3 4 L 4 3 3 P 3 3 W 5 3 3 3 3 3 3 3 G 3 3 Y PB 3 3 PB X4 P6 3 3 PF Y P 3 3 P 3 3 4 PP 6 4 PP F PP _ 4 P P 4 PG 4 W 5B 6 5B F L 5B W 4 5B 5B 6 J 4 K 5B F W 5B J 3 K 61 5F...

Page 5: ...or serious injury CAUTION Indicates a situation which could result in damage to the unit IMPORTANT Indicates important information about the use and care of the unit WARNING L basic precautions inclu...

Page 6: ...POSAL DETERGENT DISPLAY TANK CAPACITY HOT WATER SUPPLY TEMPERATURE CONTROL CONNECTION WATER SUPPLY DRAIN Inlet 3 4 FPT Outlet 1 1 2 MPT WASH TIME Standard 1 99 sec in 1 sec steps Long 10 990 sec in 10...

Page 7: ...2 W...

Page 8: ...3 Units mm in...

Page 9: ...4...

Page 10: ...5 Legend H thermistor...

Page 11: ...CI MC PM relay Fan Motor Air Flow Top View Ground Fault Circuit Interrupter Wash Tank Heater Control Wash PM Control Internal Booster Tank Heater Control Rinse PM Control Side View Fan motor is attach...

Page 12: ...t to RFT When DS closes again the AUTO FILL lamp 3 3 F W 3 If BT WLF S fails BT BUWLF S assumes control If BT BUWLF S remains closed for 1 minute o1 or o2 error appears in the display For details see...

Page 13: ...u item 01 or 02 in II D 7 b Service Menu Chart WPM draws water from WT and sends it through the wash spray arms When the wash cycle time has expired CB checks BT WLF S If BT WLF S is open the wash cyc...

Page 14: ...the rinse spray arms together with rinse water Any excess water in WT drains through the overflow pipe After RPM de energizes the unit enters a 1 second dwell time After the dwell time CB checks BT WL...

Page 15: ...ain valve W L W W J 4 K supply Lockout Tagout to prevent the power from being turned back on inadvertently Use BT drain hose to drain BT 7 J 6 J 8 Legend 2 3 backup BZ CB detergent feeder J K DS J K K...

Page 16: ...s de energized when WT WLS opens 3 open Cycle started by door switch or STANDBY CLEANING button service menu item 11 WPM energized power supplied to when WPM energized WPM de energized when unit enter...

Page 17: ...uch the electronic devices on the control board or operation board or the back of the control board or operation board 4 Do not attempt to repair the control board or operation board 5 Do not short ou...

Page 18: ...X1 X2 X3 X4 X5 X6 X7 CN8 CN9 CN10 CN1 CN7 CN6 CN5 CN11 CN13 CN12 CN4 CN2 CN3 1 4 1 6 1 10 1 1 6 2 1 1 7 5 1 3 1 1 2 3 1 5 1 8 1 4 VR1 Signal Input XA Connector 10P Power Input VH Connector 4P XH Conne...

Page 19: ...Communication Operation Panel Board Shielded Wire 1 2 3 4 5 Internal Booster Tank Water Level Float Switch Internal Booster Tank Backup Water Level Float Switch Phase Reversal Input 1 CN1 4 1 CN2 6 C...

Page 20: ...for viewing and setting of system operating details and parameters See II D 7 Service Menu and Error Log c Error Codes Errorcodes A1 to A3 H1 to H7 o1 o2 aredesignedtoprotecttheunit Thesecodes give i...

Page 21: ...s to make the dishwasher inoperable even when the door is closed service menu item 11 set for door start or press to start the selected mode service menu item 11 set for STANDBY CLEANING button start...

Page 22: ...ature Display ON wash water temperature displayed in ready mode or standby OFF rinse water temperature displayed in ready mode or standby on or oF on 13 Temperature Display Scale Fahrenheit or Celsius...

Page 23: ...5 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 5 A1 Wash Tank Auto Fill Error A2 Intern...

Page 24: ...ivated 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 Rinse Cycle T...

Page 25: ...closed display mode Switch Open Closed Display Mode The switch open closed display mode indicates when the door switch wash tank water level To enter the switch open closed display mode use the ON OF...

Page 26: ...ank water level sensor closes and segment D in the display comes on not close and segment A in the display stays off If the internal booster tank water level segment A comes on 7 Wash Cycle a When the...

Page 27: ...up closed for 1 minute Normal internal booster tank heaters off Use ON OFF button to turn the unit off and then back on Internal Booster Tank Water Level Error 2 Internal Booster Tank Water Level Floa...

Page 28: ...hree wires at the power switch GFCI connection alarm resets 5 3 Use the ON OFF button to turn off the unit Press and hold the MODE button then press the ON OFF button 01 should appear on the display U...

Page 29: ...tor not properly connected Reconnect Open circuit Repair or replace Defective Replace Rinse Pump Open circuit Repair or replace Control relay defective Replace Defective Replace Control Board Defectiv...

Page 30: ...Repair or replace Open circuit Repair or replace Control Board Defective Replace Connector not properly connected Reconnect Water supply pressure too low Readjust Internal Booster Tank Water Level Flo...

Page 31: ...t properly connected Reconnect Wash Tank Water Level Sensor Wash Tank Electrode Heavy scale or soil buildup Clean Connector not properly connected Reconnect Open circuit Repair or replace Defective Re...

Page 32: ...nal booster tank water level float switch and internal booster tank backup water level switch have remained closed for 1 minute o 1 Code Error Item Possible Cause Remedy Continues internal booster tan...

Page 33: ...as remained closed for 1 minute o 2 Code Error Item Possible Cause Remedy Continues internal booster tank heater off Operation Defective Replace Internal Booster Tank Water Level Float Switch Sticking...

Page 34: ...e energize H2 appears in the display and the buzzer sounds Z Z H W Note See III E Thermistor Check and IV M Removal and Replacement of Thermistor Control Board Defective Replace Thermistor Connector n...

Page 35: ...the display and the buzzer sounds Z Z H W Note See III E Thermistor Check and IV M Removal and Replacement of Thermistor Control Board Defective Replace Thermistor Connector not properly connected Rec...

Page 36: ...oval and Replacement of Control Board or Operation Board Control Board Defective Replace ROM RAM on control board fails H 5 Code Error Item Possible Cause Remedy Unit stops Operation EEPROM on control...

Page 37: ...H7 Z the buzzer sounds Z Z Electrical Connection Connected in wrong positions Swap two of three wires at power switch GFCI connection Power supply phase is reversed H 7 Code Error Item Possible Case R...

Page 38: ...e Wait for recovery Shut off valve closed Open Strainer clogged Clean Loose connection Tighten Not within specifications Refer to nameplate and correct Off blown fuse or tripped or defective circuit b...

Page 39: ...tinue Transformer Open coil winding Check continuity and replace Wiring to Control Board Loose connections or open Check continuity and replace Control Board In alarm See III B Error Codes Defective R...

Page 40: ...ctive Replace Out of position not rotating evenly Obstructed by cutlery or other item Reposition the cutlery or other item Wash Spray Arms Clean Low pump output Set in position See Low Wash Pump Outpu...

Page 41: ...ecified detergent only Replace Defective Replace Magnetic contactor defective Reset manually Overheat thermostat tripped Check input output and repair or replace Control output error Wash Tank Water D...

Page 42: ...ace Rinse Spray Arms Low pump output See Low Rinse Pump Output Rinse Cycle Time Too short Adjust longer Voltage Too low Call electrician Clogged Out of position not rotating evenly Obstructed by cutle...

Page 43: ...eign matter Remove obstacles Controller input output error Check input output and repair or replace Magnetic contactor defective Replace Protector tripped Wait until Rinse Pump cools Locked with forei...

Page 44: ...et to proper volume Detergent Pump Defective Replace Thermistor Out of position Set in position Wash tank water boils Problem Possible Cause Remedy Defective See III D 2 Thermistor Check Defective Rep...

Page 45: ...40 Drain Hose Clogged Unclog Wash tank water not draining Problem Possible Cause Remedy Pinched Correct Clogged Unclog Drain Pipe Overflow Pipe Raised Correct...

Page 46: ...K J 6 FK 4 4 K J K 4 4 PK 5K F 4 1 Remove the internal booster tank according to IV C Removal and Replacement of Internal Booster Tank FK Y with a mixture of 1 part of recommended cleaner Hoshizaki Sc...

Page 47: ...ently 2 Remove the control box cover then disconnect the CN7 connector from the control board see II D 2 Control Board Layout 3 To check the wash tank thermistor check the resistance across the brown...

Page 48: ...nel and side panels L and R are inserted inside the tank rim at the top and secured with 2 screws at the bottom Unscrew and pull down to remove 2 To replace reverse the above procedure 1 Remove the fr...

Page 49: ...nt Panel Side Panel L Side Panel R Control Box Bushing Control Box Cover B Control Board GFCI Buzzer Transformer Relay Magnetic Contactor Phase Reversal Relay Wire Retainer Control Box Cover A Bushing...

Page 50: ...ed back on inadvertently 5 Loosen and disconnect the rinse pump discharge line 6 Remove the band clip connecting the rinse pump and internal booster tank 7 Unscrew and remove the rinse pump from the i...

Page 51: ...wiring from the panel to remove the wash pump motor together with the panel 9 Remove the wash pump motor from the panel 10 Remove the pipe joint from the wash pump motor To replace Note Be sure to us...

Page 52: ...FF position then turn off the power supply Lockout Tagout to prevent the power from being turned back on inadvertently 2 Remove the front panel 3 Use the internal booster tank drain hose to drain the...

Page 53: ...ing back and cause injury 2 Remove the screws securing the handle to the arms and pull off the handle Note A plastic hammer or other tools may be required to pull off the handle 3 To replace reverse t...

Page 54: ...ard secured with the lower roller unit mounting screws 3 Remove the handle 7 4 Lift off the door To replace 1 Fit the roller units into the rails with the upper mounting screws held in place FK positi...

Page 55: ...Adjust the door opening closing force See IV J Adjustment of Door Opening Closing Force 7 1 Remove the spring units See IV H Removal and Replacement of Spring Unit 2 Remove the U nut K Y the spring W...

Page 56: ...See IV J Adjustment of Door Opening Closing Force X 0 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 blad...

Page 57: ...separator 2 Remove the rack guide 3 Remove the band 4 Remove the upper and lower headers PK Y 6 To replace reverse the above procedure Note Be sure to use new O rings and gaskets 7 Make a trial run an...

Page 58: ...53 3 2YK 2 0 Incorrect installation of the U packings will cause water leaks 1 Water Supply Pipe and Rinse Pump Connection Z 2 Rinse Water Line Connection Inside Double Pipe Z...

Page 59: ...eads from the wash tank electrode If replacing the internal booster tank thermistor disconnect the closed end 4 Remove the tape or ties securing the thermistor leads then pull out the thermistor from...

Page 60: ...ower from being turned back on inadvertently 2 Remove the front panel and the control box cover 3 Disconnect the control board connectors from the control board 4 Remove the 2 screws and the control b...

Page 61: ...56 Stay OP Joint Operation B Operation Panel B Tube A Tube B Operation Board Connector Cable Operation Unit Frame Mounting Screw...

Page 62: ...the arrow Lift off the lower rinse spray arm and remove the lower wash spray arm 4 If the wash spray arm and rinse spray arm nozzles are clogged use a wire or brush to unclog and wash them clean 5 Cl...

Page 63: ...The surfaces may be damaged or metal particles attached to the sensor may cause malfunction 8 Replace the separator in its correct position GK 10 Use one hand to hold the upper wash spray arm on the u...

Page 64: ...on sensitive type is used turn off the power to the detergent feeder Otherwise the detergent may be supplied during the self cleaning cycle After the cycle completes turn the detergent feeder back on...

Page 65: ...tral cleaner to wipe off dirt Then wipe away the residue with a clean cloth 1 Tilt back the rack rail and lift it off the notch 2 Remove any scraps from the wash tank Q Heater Do not use a metal brush...

Page 66: ...6K 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...

Page 67: ...ont panel then move the power switch GFCI to the OFF position 3 Turn off the water heater 4 Turn off the gas and water supplies QK0 To operate the water heater follow its instruction manual 5 Tilt bac...

Page 68: ...ing the unit after long storage contact an authorized Hoshizaki service company To prevent electric shock do not restart the unit by yourself 2 In case of relocation contact an authorized Hoshizaki se...

Page 69: ...ers and other foreign matter may enter the tank and clog the piping and wash pump resulting in reduction of washing performance or pump failure Z J K rise up to create a large gap at the tank overlap...

Page 70: ...ovided by Hoshizaki into the wash tank Z J K water line and sprayed from the upper and lower rinse spray arms into the wash compartment Inlet Water Valve Water Level Float Switch Internal Booster Tank...

Page 71: ...66...

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