Hoshizaki JWE-2400CUA-R-25B User Manual

NO. J002-794
ISSUED: APR. 1, 2011
REVISED: SEP. 6, 2011

MODEL

HOSHIZAKI

DISHWASHER

JWE-2400CUA-L-25B
JWE-2400CUA-R-25B

SERVICE MANUAL

IMPORTANT

Only qualifi ed service technicians should install, service, and maintain the
unit. No service or maintenance should be undertaken until the technician
has thoroughly read this Service Manual. Failure to service and maintain
the equipment in accordance with this manual may adversely affect safety,
performance, component life, and warranty coverage.

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.

HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 30269

Attn: Hoshizaki Technical Support Department
Phone: [phone] Technical Support

[phone]
Fax: [phone]
[phone]
E-mail: [e-mail]

Web Site: www.hoshizaki.com
NOTE: To expedite assistance, all correspondence/communication MUST include the

following information:

• Model Number

• Serial Number

• Complete and detailed explanation of the problem.

IMPORTANT

This manual should be read carefully before the unit is serviced or maintenance
operations are performed. Only qualifi ed service technicians should install,
service, and maintain the unit. Read the warnings contained in this booklet
carefully as they give important information regarding safety. Please retain this
booklet for any further reference that may be necessary.

CONTENTS

I. Specifi cations ------------------------------------------------------------------------------------------------ 1

A. Specifi cation Sheet ------------------------------------------------------------------------------------- 1

1. JWE-2400CUA-L-25B ------------------------------------------------------------------------------ 1

2. JWE-2400CUA-R-25B ------------------------------------------------------------------------------2
B. Nameplate Rating --------------------------------------------------------------------------------------- 3
C. Dimensions/Connections ------------------------------------------------------------------------------ 4

1. JWE-2400CUA-L-25B ------------------------------------------------------------------------------ 4

2. JWE-2400CUA-R-25B ------------------------------------------------------------------------------5

II. General Information ---------------------------------------------------------------------------------------- 6

A. Construction ---------------------------------------------------------------------------------------------- 6

1. Dishwasher -------------------------------------------------------------------------------------------- 6

2. Booster Tank ------------------------------------------------------------------------------------------7

3. Control Box -------------------------------------------------------------------------------------------- 8
B. Functions -------------------------------------------------------------------------------------------------- 9

1. Increasing Rinse Water Flow Rate -------------------------------------------------------------- 9
C. Sequence of Operation -------------------------------------------------------------------------------- 9

1. Auto Fill Cycle ----------------------------------------------------------------------------------------- 9

2. Ready Cycle (Unit Inactive) ----------------------------------------------------------------------10

3. Wash Cycle/Rinse Cycle --------------------------------------------------------------------------10

4. Table Limit Switch -----------------------------------------------------------------------------------11

5. Emergency Stop Button ---------------------------------------------------------------------------11

6. Drain----------------------------------------------------------------------------------------------------11
D. Sequence of Operation Flow Chart ----------------------------------------------------------------12
E. Timing Chart ---------------------------------------------------------------------------------------------13

1. Auto Fill Cycle ----------------------------------------------------------------------------------------13

2. Wash Cycle/Rinse Cycle --------------------------------------------------------------------------14
F. Control Board and Operation Board ---------------------------------------------------------------15

1. Control Board Location ----------------------------------------------------------------------------15

2. Control Board Layout ------------------------------------------------------------------------------16

3. Control Board Diagram ----------------------------------------------------------------------------17

4. Operation Panel Layout ---------------------------------------------------------------------------18

5. Features -----------------------------------------------------------------------------------------------18

6. Controls, Adjustments, and Lamps -------------------------------------------------------------18

7. Service Menu and Error Log ---------------------------------------------------------------------19

8. Temperature Display -------------------------------------------------------------------------------21

9. Error Codes ------------------------------------------------------------------------------------------21

10. Buzzer -------------------------------------------------------------------------------------------------21

11. Operation Time Display ----------------------------------------------------------------------------22
i

12. Special Modes ---------------------------------------------------------------------------------------22

III. Service Diagnosis ----------------------------------------------------------------------------------------24

A. Diagnostic Procedure ---------------------------------------------------------------------------------24
B. Error Codes ----------------------------------------------------------------------------------------------26

1. Error Code Table ------------------------------------------------------------------------------------26

2. Error Code Log --------------------------------------------------------------------------------------27

3. Error Code Details ----------------------------------------------------------------------------------28

C. Service Flow Charts -----------------------------------------------------------------------------------41

1. Unit Will Not Start -----------------------------------------------------------------------------------41

2. Dishes Not Clean -----------------------------------------------------------------------------------43

3. Inadequate Rinse -----------------------------------------------------------------------------------45

4. Dishwasher Will Not Start Wash/Rinse Cycle -----------------------------------------------46

5. No or Inadequate Detergent/Rinse Aid Supply ----------------------------------------------47

6. Wash Tank Water Boils ----------------------------------------------------------------------------47

7. Wash Tank Water Not Draining ------------------------------------------------------------------48

D. Float Switch Check and Cleaning ------------------------------------------------------------------49

1. Float Switch Check ---------------------------------------------------------------------------------49

2. Float Switch Cleaning ------------------------------------------------------------------------------49

E. Thermistor Check --------------------------------------------------------------------------------------50

IV. Removal and Replacement of Components -------------------------------------------------------51

A. Removal of Panels -------------------------------------------------------------------------------------51
B. Removal and Replacement of Wash Pump Motors -------------------------------------------51
C. Removal and Replacement of Rinse Pump Motor ---------------------------------------------52
D. Removal and Replacement of Gear Motor ------------------------------------------------------55
E. Removal and Replacement of Conveyor ---------------------------------------------------------56
F. Removal and Replacement of Crankshaft --------------------------------------------------------57
G. Removal and Replacement of Control Box ------------------------------------------------------58
H. Removal and Replacement of Thermistor -------------------------------------------------------58
I. Removal and Replacement of Control Board or Operation Board --------------------------59

1. Control Board ----------------------------------------------------------------------------------------59

2. Operation Board -------------------------------------------------------------------------------------60
J. Removal and Replacement of Heater -------------------------------------------------------------61
K. Removal and Replacement of Float Switch -----------------------------------------------------62
L. Removal and Replacement of Thermostat -------------------------------------------------------63

V. Cleaning and Maintenance Instructions -------------------------------------------------------------64

A. Daily Maintenance -------------------------------------------------------------------------------------64
B. Weekly Maintenance ----------------------------------------------------------------------------------69

1. Heater --------------------------------------------------------------------------------------------------69

2. Exterior ------------------------------------------------------------------------------------------------69
C. Monthly Maintenance ---------------------------------------------------------------------------------69

1. Water Supply Line ----------------------------------------------------------------------------------69
D. Descaling (As Required) -----------------------------------------------------------------------------70
E. Shutdown -------------------------------------------------------------------------------------------------70
F. Long Storage, Relocation, Disposal, Transfer ---------------------------------------------------72

VI. Operating Instructions -----------------------------------------------------------------------------------72
VII. Technical Information -----------------------------------------------------------------------------------73

A. Water Circuit ---------------------------------------------------------------------------------------------73
B. Wiring Diagram -----------------------------------------------------------------------------------------74

ii

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

NOTICE

Indicates a situation which could result in damage to the unit or

IMPORTANT

This product should be destined only to the use for which it has been expressly
conceived. Any other use should be considered improper and therefore
dangerous. The manufacturer cannot be held responsible for injury or damage
resulting from improper, incorrect, and unreasonable use.

To reduce the risk of death, electric shock, serious injury, or fi re, follow
basic precautions including the following:

• Only qualified service technicians should install, service, and maintain the
unit.

• Electrical connection must be hard-wired and must meet national, state, and
local electrical code requirements. Failure to meet these code requirements
could result in death, electric shock, serious injury, fi re, or severe damage to
equipment.

• This unit requires independent power supplies for the dishwasher and for the
booster tank. See the nameplate for proper voltage and breaker/fuse sizes.
Failure to use proper breakers or fuses can result in tripped breakers, blown
fuses, or damage to existing wiring. This could lead to heat generation or fi re.

• THIS UNIT MUST BE GROUNDED. Failure to properly ground this unit could
result in death or serious injury.

• Use the “ON/OFF” button on the operation panel to turn off the unit, then turn
off the dishwasher and booster tank power supplies before servicing. Lockout/
Tagout to prevent the power supplies from being turned back on inadvertently .

• Do not make any alterations to the unit. Alterations could result in electric
shock, injury, fi re, or damage to the unit.

• To avoid possible burns and spills, be sure to drain the wash tank and internal
booster tank and let the components cool before servicing. When draining the
internal booster tank, wait until the water temperature falls below 104°F (40°C).

• When disassembling components that have been in contact with detergent,
wear rubber gloves and goggles. Before starting disassembly, thoroughly
read the detergent safety instructions. Contact with skin may cause irritation
and contact with eyes may cause blindness.

• When using an acidic descaling cleaner, wear rubber gloves and goggles.
Contact with skin may cause irritation, and contact with eyes may cause
blindness. Do not use or mix with a dishwashing detergent. Some detergents
may generate toxic chlorine gas.

Indicates a hazardous situation which could result in death or

serious injury.

property.

Indicates important information about the use and care of the

unit.

WARNING

iii

I. Specifi cations
A. Specifi cation Sheet

1. JWE-2400CUA-L-25B

DISHWASHER SIDE BOOSTER SIDE

AC SUPPLY VOLTAGE
POWER SUPPLY CAPACITY

AMPERAGE

STARTING AMPERAGE
ELECTRICAL COMSUMPTION

HEATER

RACK SIZE

NUMBER OF LARGE DISHES / RACK

CAPACITY
WATER COMSUMPTION
PASSING HEIGHT
DIRECTION OF OPERATION
OUTSIDE DIMENSIONS
EXTERIOR
DOOR
LEG
WASH SYSTEM ,RINSE SYSTEM
PUMP
DRAIN SYSTEM
START
DRY SYSTEM
REFUSE DISPOSAL
DETERGENT
DISPLAY

TANK CAPACITY
HOT WATER SUPPLY

TEMPERATURE CONTROL

CONNECTION – WATER SUPPLY
– DRAIN

CONTROL Microprocessor control
BOIL – DRY PROTECTION

SAFETY SYSTEM

WEIGHT Net 430lb (195kg) / Gross 584lb (265kg)

PACKAGE

CERTIFICATION

ACCESSORIES-SUPPLIED

ACCESSORIES-REQUIRED Universal rack (addition), Ventilation hoods x 2, Drain Tempering Kit

OPERATION CONDITIONS

* The rated properties are based on measurements at ambient temperature of 86ºF (30ºC) according to the Technical

Requirements for Electrical Appliances.

* We reserve the right to make changes in specifications and design without prior to notice.

3 phase 3-wire 208-230V/60Hz (±10%) /
208V : 18.4kVA(51.1A)

230V : 22.1kVA(55.5A)
Max Running 51.2A
Rated Motor 9.0A

26.0A
Max 19.86kW
Rated Motor 3.06kW
Power Factor 84%

16.80kW(230V) 25.20kW(230V)
19-3/4" × 19-3/4"(500 × 500mm)
16 plates (9.1” DIA)
240/200/160racks/hour㩷adjustable in 3 steps (rotary switch)
114Gal/hour(432L/hour), 0.48 Gal/rack(1.8L/rack) - at 240rack/hour

20.5" (520mm)
Left to Right
W57.3" × D27.6" × H58.1" (W1,455 × D700 × H1,475mm)
Stainless Steel
Vertically Sliding Service Panel(Opening:W25.6" × H18.9")
Stainless Steel Adjustable 9.4" - 11.0"
Upper and Lower Fixed Spray
Wash 1HP x 2, Rinse 0.134HP
Draw Out Overflow Pipe, Overflow Drain
Rack Detection (Wash/Rinse)
Residual Heat Drying
Filter Collection
Not Provided
Wash Water Temperature / Rinse Water Temperature (selectable by switch)
Ready, Auto Fill, Wash, Error Code

27.2Gal (103L)
Automatic Hot Water Supply by
Microprocessor Control
Wash: 160ºF (71ºC) min.

Thermistor Control: 163ºF(73㩷C) – 168㩷㪝(76C)

Inlet: 3/4"FPT
Outlet: 1-1/2"MPT

Water Level Switch,
Bimetal Thermostat (Manual - Reset),
Thermistor (Auto - Reset)
Service Panel Switch, Emergency Stop by Microprocessor Control
Table Limit Switch, Emergency Stop Button, Conveyor Overload Protector

Carton + Crate
W62.6"×D32.9"×H65.9" (W1,590mm ×D 835mm × 1,675mm)
NSF ANSI-3, ETL, cETL, Energy Star
Universal rack (19-3/4" x 19-3/4"), Instruction manual, Installation manual
Maintenance sheet, Curtain(L), Curtain(S) x 2, Shaft - curtain(L), Shaft - curtain (S) x 2
Guard(L), Guard(R), Hook - Drain, Table limit Switch, Upper wash spray arm,
Operation box assembly, Cable cover, Inlet water strainer & Packing

Ambient Temperature: 41 - 95ºF (5ºC - 35ºC), Voltage Range: Rated Voltage ±10%
Recommends Water Hardness : 4gpg (grains per gallon) (68.5ppm) or less
Water Supply Temperature: 110 - 167ºF (43ºC - 75ºC) ( Recommends 140 ºF (60ºC))
Water Supply Pressure (Gauge Static Pressure): 10 - 70PSIG (0.07 - 0.48 MPa)
Exhaust Requirements : 200CFM(Entrance End),400CFM(Discharge End)



2 power supply lines

208V : 20.6kVA(57.2A)
230V : 25.3kVA(63.5A)
Max Running 63.3A

Max 25.20kW

12.4Gal (47L)
Automatic Hot Water Supply by
Water Valve
Rinse: 180ºF (82ºC) min.

Thermistor Control: 182ºF(83ºC)-185ºF (85ºC)

Float Switch,
Bimetal Thermostat (Manual - Reset),
Thermistor (Auto - Reset)

㩷

1

2. JWE-2400CUA-R-25B

DISHWASHER SIDE BOOSTER SIDE

AC SUPPLY VOLTAGE
POWER SUPPLY CAPACITY

AMPERAGE

STARTING AMPERAGE
ELECTRICAL COMSUMPTION

HEATER

RACK SIZE

NUMBER OF LARGE DISHES / RACK

CAPACITY
WATER COMSUMPTION
PASSING HEIGHT
DIRECTION OF OPERATION
OUTSIDE DIMENSIONS
EXTERIOR
DOOR
LEG
WASH SYSTEM ,RINSE SYSTEM
PUMP
DRAIN SYSTEM
START
DRY SYSTEM
REFUSE DISPOSAL
DETERGENT
DISPLAY

TANK CAPACITY
HOT WATER SUPPLY

TEMPERATURE CONTROL

CONNECTION – WATER SUPPLY
– DRAIN

CONTROL Microprocessor control
BOIL – DRY PROTECTION

SAFETY SYSTEM

WEIGHT Net 430lb (195kg) / Gross 584lb (265kg)

PACKAGE

CERTIFICATION

ACCESSORIES-SUPPLIED

ACCESSORIES-REQUIRED Universal rack (addition), Ventilation hoods x 2, Drain Tempering Kit

OPERATION CONDITIONS

* The rated properties are based on measurements at ambient temperature of 86ºF (30ºC) according to the Technical

Requirements for Electrical Appliances.

* We reserve the right to make changes in specifications and design without prior to notice.

3 phase 3-wire 208-230V/60Hz (±10%) /
208V : 18.4kVA(51.1A)

230V : 22.1kVA(55.5A)
Max Running 51.2A
Rated Motor 9.0A

26.0A
Max 19.86kW
Rated Motor 3.06kW
Power Factor 84%

16.80kW(230V) 25.20kW(230V)
19-3/4" × 19-3/4"(500 × 500mm)
16 plates (9.1” DIA)
240/200/160racks/hour㩷adjustable in 3 steps (rotary switch)
114Gal/hour(432L/hour), 0.48 Gal/rack(1.8L/rack) - at 240rack/hour

20.5" (520mm)
Right to Left
W57.3" × D27.6" × H58.1" (W1,455 × D700 × H1,475mm)
Stainless Steel
Vertically Sliding Service Panel(Opening:W25.6" × H18.9")
Stainless Steel Adjustable 9.4" - 11.0"
Upper and Lower Fixed Spray
Wash 1HP x 2, Rinse 0.134HP
Draw Out Overflow Pipe, Overflow Drain
Rack Detection (Wash/Rinse)
Residual Heat Drying
Filter Collection
Not Provided
Wash Water Temperature / Rinse Water Temperature (selectable by switch)
Ready, Auto Fill, Wash, Error Code

27.2Gal (103L)
Automatic Hot Water Supply by
Microprocessor Control
Wash: 160ºF (71ºC) min.

Thermistor Control: 163ºF(73㩷C) – 168㩷㪝(76C)

Inlet: 3/4"FPT
Outlet: 1-1/2"MPT

Water Level Switch,
Bimetal Thermostat (Manual - Reset),
Thermistor (Auto - Reset)
Service Panel Switch, Emergency Stop by Microprocessor Control
Table Limit Switch, Emergency Stop Button, Conveyor Overload Protector

Carton + Crate
W62.6"×D32.9"×H65.9" (W1,590mm ×D 835mm × 1,675mm)
NSF ANSI-3, ETL, cETL, Energy Star
Universal rack (19-3/4" x 19-3/4"), Instruction manual, Installation manual
Maintenance sheet, Curtain(L), Curtain(S) x 2, Shaft - curtain(L), Shaft - curtain (S) x 2
Guard(L), Guard(R), Hook - Drain, Table limit Switch, Upper wash spray arm,
Operation box assembly, Cable cover, Inlet water strainer & Packing

Ambient Temperature: 41 - 95ºF (5ºC - 35ºC), Voltage Range: Rated Voltage ±10%
Recommends Water Hardness : 4gpg (grains per gallon) (68.5ppm) or less
Water Supply Temperature: 110 - 167ºF (43ºC - 75ºC) ( Recommends 140 ºF (60ºC))
Water Supply Pressure (Gauge Static Pressure): 10 - 70PSIG (0.07 - 0.48 MPa)
Exhaust Requirements : 200CFM(Entrance End),400CFM(Discharge End)



2 power supply lines

208V : 20.6kVA(57.2A)
230V : 25.3kVA(63.5A)
Max Running 63.3A

Max 25.20kW

12.4Gal (47L)
Automatic Hot Water Supply by
Water Valve
Rinse: 180ºF (82ºC) min.

Thermistor Control: 182ºF(83ºC)-185ºF (85ºC)

Float Switch,
Bimetal Thermostat (Manual - Reset),
Thermistor (Auto - Reset)

㩷

2

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.

3

C. Dimensions/Connections

1. JWE-2400CUA-L-25B

Units: mm [in.]

4

2. JWE-2400CUA-R-25B

Units: mm [in.]

5

II. General Information
A. Construction

1. Dishwasher

The illustration below shows JWE-2400CUA-L-25B (left-to-right rack fl ow).

Operation Panel

Vertically Sliding

Wash Spray Arm (stationary)

Service Panel

Emergency Stop Button

Rinse Spray Arm (stationary)

Rinse Start Switch

Wash Start Switch

Service Panel Switch

Conveyor Motor

Wash Tank (26 gallons)

Wash Tank Thermistor

Wash Tank Heater

Rack Flow

Water Level Sensor

Wash Pump
(Upper/Lower Spray Arm)

Rinse Pump

Conveyor

Table Limit Switch

Booster Tank

Water Valve

Backup Water
Level Float Switch

Water Level Float Switch

Water Level Safety
Float Switch

Booster Tank Thermistor

Booster Tank Heater

6

2. Booster Tank

Top View

Thermostat Plate

Sheathed Heater [H7 - 15]

Band Heater

Hot Water Outlet Pipe

Overfl ow Pipe

Thermal Protector [TH7 - 12]
(heater boil dry protection)

Front View

Thermal Protector [TH14]

Drain Hose

Inlet Water
Valve [WV]

Inlet Pipe

Water Level Float Switch [FS1]
(downward end)

Backup Water Level Float Switch [FS2]
(upward end)

Water Level Safety Float Switch [FS3]
(downward end)

Thermistor [TH2]
(hot water temperature control)

Strainer

7

3. Control Box

Magnetic Contactor

(Upper Wash Spray Arm PM)

Magnetic Contactor

(Lower Wash Spray Arm PM)

Voltage Tap Switch

Magnetic Contactor

MC1, 2: Wash Tank Heater Control

(MC1: right, MC2: left)

not change settings.

Terminal Block

Inverter

* NOTICE: To prevent failure, do

TB3: Detergent/Rinse Aid Feeder

Magnetic Contactor

MC5 - 7: Booster Tank Heater Contactors

(MC5: upper, MC6: lower left, MC7: lower

right)

Main Transformer

(Control Supply)

Relay

X10: Rinse PM Control

X11: Service Panel Switch

X12: Phase Reversal Relay

X13: Booster Tank Water Valve

X14: Conveyor Drive Signal

X15: Booster Tank Heater Control Relay

Terminal Block

TB1: For Dishwasher

TB2: For Booster Tank

Fan MotorFan

Control Board

Conveyor Speed

Switch

Phase Reversal Relay

Control Transformer

(Control Board)

Buzzer

8

B. Functions

1. Increasing Rinse Water Flow Rate

Upper Rinse Spray Arm

The rinse water fl ow rate is factory adjusted to 1.90 gal/min

Clean Pipe

(7.2 L/min). To increase the fl ow rate to 3.17 gal/min (12 L/

min), follow the steps below. Hot water supply of at least

3.44 gal/min (13 L/min) and 113°F (45°C) will be required.

Lower Rinse
Spray Arm

1) Remove the upper and lower rinse spray arms.

2) Loosen the clean pipe nut, and remove the clean pipe.

Spacer

3) Remove the spacer (with 4.5 mm DIA hole) from the nut at the unit side.

4) Replace the clean pipe and the upper and lower rinse spray arms in their correct positions.

C. Sequence of Operation

The steps in the sequence are as outlined below.

1. Auto Fill Cycle
"AUTO FILL" lamp fl ashing and "RINSE TEMP." or "WASH TEMP." lamp on.

If BT WLF/S is open when the "ON/OFF" button is pressed, WV energizes after BT auto fi ll
delay time (factory default: 10 seconds).
When BT WLF/S closes, WV de-energizes, the "AUTO FILL" lamp fl ashes and the auto fi ll
cycle starts.
RPM energizes for length of time set by the auto fi ll cycle rinse time setting (factory default:
13 minutes). For details, see "Auto Fill Cycle Rinse Time" (service menu item 03) in "II.F.7.b)
Service Menu Chart."
At the end of the auto fi ll cycle, there is a 5-second dwell time. CB checks WT WLS. If WT
WLS is closed, BZ beeps, the "AUTO FILL" lamp goes off and the "READY" lamp comes
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)."
If the BT water level goes down and BT WLF/S opens during the auto fill cycle, WV
energizes after BT auto fi ll delay time (factory default: 10 seconds). For adjustment of this
delay time, see "Booster Tank Auto Fill Delay Time" (service menu item 08) in "II.F.7.b)
Service Menu Chart." If delay time is set shorter, WV energizes/de-energizes frequently
and BT may not supply hot water of proper temperature.
If SP is opened during the auto fi ll cycle, SPS opens, RPM de-energizes. The "AUTO FILL"
lamp keeps flashing and the rinse cycle time keeps counting down. When SPS closes
again, RPM energizes.
If WLS is closed when the "ON/OFF" button is pressed, the "READY" lamp comes on and
the unit is ready to start.

Nut

Note:

1. If SP is opened during the auto fi ll cycle, RPM de-energizes to stop hot water supply.
If SP is left open for a long time, WT may not fi ll by the end of the auto fi ll cycle. In this
case, WT WLS opens when the unit starts, and the supplementary fi ll cycle begins.

2. WTH is energized when WT WLS closes during the auto fi ll cycle.

3. BTH is energized during the auto fi ll cycle if WLSF/S is closed.

9

4. 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 "III.B. Error Codes."

5. The wash/rinse start switch is inactive during the auto fi ll cycle.

2. Ready Cycle (Unit Inactive)

"READY" lamp and "RINSE TEMP." or "WASH TEMP." lamp on.

WT WLS closed. After a rinse cycle, RPM de-energizes, and the "READY" lamp comes on.
WTH energizes when WT water temperature is at the wash temperature setpoint or
lower. WTH de-energizes when WT water temperature is 5°F (3°C) above the setpoint.
For details, see "Wash Temperature Setpoint" (service menu item 04) in "II.F.7.b) Service
Menu Chart."
BTH energizes when BT water temperature is 3°F (2°C) below the rinse temperature
setpoint or lower. BTH de-energizes when BT water temperature reaches the setpoint.
WV energizes/de-energizes when BT WLF/S opens/closes. For details, see "Rinse
Temperature Setpoint" (service menu item 05) in "II.F.7.b) Service Menu Chart."

Note:

1. The thermistors control WT and BT water temperatures.

2. If one of the thermistors has an open or short circuit, WTH or BTH de-energizes and an
error code appears in the display.

3. WTH and BTH are controlled regardless of SPS operation.

3. Wash Cycle/Rinse Cycle

"WASH" lamp and "RINSE TEMP." or "WASH TEMP." lamp on.

When a rack is loaded from the wash compartment entrance and the wash start switch
closes, WPM energizes, power is supplied to DFT and the "WASH" lamp comes on. WPM
draws water from WT and sends it through the wash spray arms. The upper spray arm
WPM starts fi rst, followed by the lower spray arm WPM. Then, the conveyor starts to move
the rack. After the wash start switch opens and the extended wash cycle time (factory
default: 30 seconds) has expired, WPM de-energizes and power is cut to DFT. For details,
see "Extended Wash Cycle Time" (service menu item 01) in "II.F.7.b) Service Menu Chart."
When the rinse start switch closes, RPM energizes and power is supplied to RFT. RPM
draws water from BT and sends it through the rinse spray arms. Rinse aid is fed into the
rinse water line and sprayed from the rinse spray arms together with rinse water. Any
excess water in WT drains through the overfl ow pipe. After the rinse start switch opens
and the extended rinse cycle time (factory default: 15 seconds) has expired, RPM de­energizes, power is cut to RFT, the "WASH" lamp goes off and the "READY" lamp comes
on. For details, see "Extended Rinse Cycle Time" (service menu item 02) in "II.F.7.b)
Service Menu Chart."
After both WPM and RPM de-energize, the conveyor stops. If SP is opened during
operation, SPS opens, WPM and RPM de-energize and the conveyor stops. If the wash/
rinse start switch is closed when SPS closes, WPM and RPM energize and the conveyor
restarts.

Note:

1. If WT WLS opens after WPM energizes, WPM de-energizes and RPM energizes for
the supplementary fi ll cycle time (factory default: 450 seconds) to supply hot water into

10

WT. The conveyor does not start during the supplementary fi ll cycle. "A3" appears in the
display and the "AUTO FILL" lamp fl ashes. BZ beeps three times only at the beginning.
If WT WLS is still open after the supplementary fi ll cycle, another cycle starts. If WT
WLS still does not close, "A3" appears in the display, BZ beeps and the unit shuts down.
For adjustment of the supplementary fi ll cycle time, see "Supplementary Fill Cycle Time"
(service menu item 07) in "II.F.7.b) Service Menu Chart." For details, see "III.B.3.c)
Wash Tank Water Level Error (A3)."

2. If WT WLS and the wash start switch are closed after RPM runs for the supplementary
fi ll cycle time, WPM energizes and the conveyor starts.

3. If SP is opened and closed during operation and the wash/rinse start switch is open, the
unit does not resume operation. Load another rack to close the wash start switch. The
unit resumes operation if SP is closed during the extended wash/rinse cycle time.

4. Table Limit Switch

If a rack reaches the end of the clean dishtable and actuates TLS lever (TLS closed),
WPM and RPM de-energize, the conveyor stops and "L1" appears in the display. When
the rack is removed and TLS lever returns to the original position (TLS open), WPM and
RPM energize and the conveyor starts after 3 seconds unless the wash/rinse start switch
is open.

5. Emergency Stop Button

To shut down the unit in case of emergency, press ESB on top of the unit (wash
compartment exit side). To resume operation, turn ESB clockwise to unlock and press the
"ON/OFF" button on the operation panel.

Note: The unit is inoperative without ESB connected at the time of installation.

6. Drain

This unit does not have a drain valve.
The overfl ow pipe in WT drains excess water from WT. To completely drain WT, remove
the overfl ow pipe.
To drain BT, use the “ON/OFF” button on the operation panel to turn off the unit, then turn
off the dishwasher and booster tank power supplies. Lockout/Tagout to prevent the power
supplies from being turned back on inadvertently.

Use BT drain hose to drain BT. WARNING! To avoid possible burns, allow BT water

temperature to fall below 104°F (40°C) before draining.

Legend: BT–booster tank; BTH–booster tank heater; BUWLF/S–backup water level fl oat

switch; BZ–buzzer; CB–control board; DFT–detergent feeder terminals (detergent
feeder not provided by Hoshizaki); DS–door switch; ESB–emergency stop button;

RFT–rinse aid feeder terminals (rinse aid feeder not provided by Hoshizaki);
RPM–rinse pump motor; SP–service panel; SPS–service panel switch; WLSF/
S–water level safety float switch; TLS–table limit switch; WLF/S–water level
fl oat switch; WLS–water level sensor; WPM–wash pump motor; WT–wash tank;
WTH–wash tank heater; WV–inlet water valve

11

D. Sequence of Operation Flow Chart

p

g

y
g

g

y

g

g

(

g

(

g

(
g

g

g

g

g

g

g

g

g

g

g

g

g

g

g

g
g

g

y

g
g

g

g

g

g

g
g

g

y

g

g

y

g

g

g

p

g

p

g

g

g

ized

ens

ized

BT WLF/S

ized b

followed by the lower spray arm WPM

JWE-2400CUA-25B

WT WLS

monitored

during Wash

power supplied to RFT

ized when RSS opens

ized

power supplied to DFT RPM ener

ized when WSS opens RPM de-ener

ized

WPM de-ener

and the extended wash cycle time and the extended rinse cycle time

ized when WT water temp. at

ized while WPM and RPM ener

ized GM ener

ized when WT water temp. at WTH ener

ized when WPM ener

GM ener

WTH ener

de-energized) de-energized)

ized when WT water temp.

ized when WT water temp. WTH de-ener

WTH de-ener

wash temp. setpoint (service menu item wash temp. setpoint (service menu item

is 5ºF (3ºC) above wash temp. setpoint is 5ºF (3ºC) above wash temp. setpoint

ized b

ized when BT water temp.

ized when BT water temp. 3ºF

ized when BT water temp. BTH de-ener

ized when BT water temp. 3ºF BTH ener

BTH de-ener

menu item 05) or lower menu item 05) or lower

ized when BT WLSF/S

ized/de-ener

BT WLF/S WV ener

ized b

ized when BT WLSF/S BTH de-ener

ized/de-ener

WV ener

BTH de-ener

reaches rinse temp. setpoint (service reaches rinse temp. setpoint (service

menu item 05) menu item 05)

opens opens

ized when WT WLS o

ized when WTH ener

FCT ener

ens WTH de-ener

WT WLS

ized when WT WLS o

ized when WPM

FCT ener

WTH de-ener

energized

WPM and GM de-energized

RPM energized

(time=service menu item 07)

WT WLS open

"A3"error appears in display.

repeats twice

ized when WT water

Dishwasher Sequence Flow Chart

WT WLS closed

WT WLS

WT WLS check.

• SPS must be closed for RPM to energize • Cycle started by wash start switch • Cycle started by rinse start switch

• RPM time: (service menu item 03) • SPS must be closed for WPM to energize • SPS must be closed for RPM to energize

• RFT de-energized during Auto Fill Cycle • The upper spray arm WPM starts first,

ins here

Cycle Steps 1. Auto Fill Cycle 2. Ready Cycle (Unit Inactive) 3. Wash Cycle 4. Rinse Cycle

Initial startu

be

ized when WT water temp. WPM ener

WTH de-ener

WTH ener

item 04) or lower

check

ized b

time=service menu

ized

ized/de-ener

cle if closed.

BT WLF/S at wash temp. setpoint (service menu when WPM energized) when RPM energized)

RPM ener

item 03)

WV ener

Go to Ready

C

temp. is 5ºF (3ºC) above wash temp. (service menu item 01) has expired (service menu item 02) has expired

ized when BT WLSF/S

closed setpoint (service menu item 04) (power cut to DFT when WPM (power cut to RFT when RPM

BTH ener

ized when BT water

ized when BT water temp.

BTH de-ener

temp. reaches rinse temp. setpoint 04) or lower 04) or lower

(service menu item 05) or lower

ized when RPM

ized when WT WLS BTH ener

FCT ener

WTH ener

closed 3ºF (2ºC) below rinse temp. setpoint

energized

ized when BT WLSF/S BTH ener

ized/de-ener

WV ener

(service menu item 05)

BT WLF/S (service menu item 04) (service menu item 04)

BTH de-ener

WT WLS open

"A1" error appears

in display.

ized

ized when WT WLS

"A3"error appears

FCT de-ener

WTH de-ener

opens (2ºC) below rinse temp. setpoint (service (2ºC) below rinse temp. setpoint (service

opens

Legend:

BT–internal booster tank

BTH–internal booster tank heater

DFT–detergent feeder terminals

GM-gear motor (conveyor)

RFT–rinse aid feeder terminals

RPM–rinse pump motor

RSS-rinse start switch

in display.

SPS–service panel switch

VFCT-vent fan control terminals

WLF/S–water level float switch

unit shuts down

WLS–water level sensor

WLSF/S-water level safety float switch

WPM–wash pump motor

WSS-wash start switch

WT–wash tank

WTH–wash tank heater

WV–inlet water valve

12

E. Timing Chart

u

1. Auto Fill Cycle

Note 2

(Repeat)

Service menu item 03

Approx. 13 gal (50L) water level

Note 1 Note 1

Auto Fill Cycle Rinse Time (*13 min) 2 gal (7.8L)/min x 13 min = 20 gal (101L)

Note 3

If the booster tank water level float switch does not close after 10 minutes in booster tank auto fill, error code "A2" (booster tank auto

Booster tank auto fill delay time (*10 seconds): If auto fill cycle starts immediately after the booster tank water level float switch opens,

the booster tank fills up too soon, and the water valve energizes/de-energizes frequently, resulting in no hot water supply.

Note 1:

After the rinse pump motor de-energizes, there is a 5-second dwell time to stabilize the water level before checking the water level

Note 2:

* Factory default, adjustable by service men

OFF

OFF

OFF

OFF

OPEN

OFF

OFF

OPEN

CLOSED

OPEN

CLOSED

OPEN

OFF

OPEN

OFF

OFF

fill error) appears in the display, and the unit shuts down.

sensor status.

Note 3:

"ON/OFF" Button ON

"AUTO FILL" Lamp ON

"READY" Lamp ON

"WASH" Lamp ON

Service Panel Switch CLOSED

Rinse Pump ON

Water Valve ON

Water Level Float Switch CLOSED

Backup Water Level

Float Switch

Water Level Safety Float

Switch

Booster Tank Thermistor Setpoint

Booster Tank Heater ON

Water Level Sensor CLOSED

Buzzer ON

Wash Tank Heater ON

Booster Tank

13

2. Wash Cycle/Rinse Cycle

u

y

g

g

y

g

y

y

(

)

Note 3

Service menu item 02

cle continuesNote 1:

cle continues

ize

Extended Rinse Cycle Time (*15 sec)

Note 2

Service menu item 01

Extended Wash Cycle Time (*30 sec)

Note 1

Note 4

Load rack

Note 4

0.5 sec

Time

Dela

this time to close the wash start switch, wash c

this time to close the rinse start switch, rinse c

or stops when both the wash pump and the rinse pump de-ener

* Factory default, adjustable by service men

If another rack is loaded durin

wash/rinse cycle.

Note 2: If another rack is loaded durin

Note 3: The conve

Note 4: The rack handle shape opens the wash/rinse start switch for a moment. But the extended wash/rinse cycle time prevents interruption of the

OFF

OFF

OFF

OFF

OPEN

OPEN

OPEN

OFF

OFF

OPEN

OFF

OFF

OFF

Setpoint

OFF

"ON/OFF" Button ON

"AUTO FILL" Lamp ON

"READY" Lamp ON

"WASH" Lamp ON

Service Panel Switch CLOSED

Water Level Sensor CLOSED

Wash Start Switch CLOSED

Upper Wash Pump ON

Lower Wash Pump ON

Rinse Start Switch CLOSED

Rinse Pump ON

Conveyor (Gear Motor) ON

Buzzer ON

Wash Tank Thermistor

Wash Tank Heater ON

14

F. 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.

NOTICE

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. It is especially important to
touch the metal part of the unit when handling or replacing the control board
or operation board.

3. Do not touch 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 out power supply to test for voltage.

1. Control Board Location

The control box is located behind the front panel. Follow the instructions and warnings for
safe and effi cient operation of the unit.

Control Box

15

2. Control Board Layout

Inputs and outputs are laid out on the control board as illustrated below.







Signal Input XA Connector (10P)

Signal Input XA Connector (6P)



Thermistor Signal Input



XA Connector (4P)



























4

1

8

1

5

1

1

CN7

CN6

CN5

CN8

10

1

CN11

3

CN9

Low

Buzzer Volume

CN13

Buzzer Output XA Connector (2P)

Power Input VH Connector (4P)

2

16

CN10

High

112

VR1

CN12

1 4

CN1

X1

X2

X3

X4

X5

X6

X7

13

CN2

1

6

1

7

CN3

1

5

CN4

Power Input VH Connector (6P)

Output VH Connector (7P)

Output VH Connector (5P)



Operation Board XA Connector (5P)











XH Connector (3P): not in use

XH Connector (2P): not in use

Booster Tank Water Level Safety

Signal Input XA Connector (3P)

16

3. Control Board Diagram

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

1

y







200VAC from Transformer





Transformer

11V 7.7V



[Communication]
Operation Panel
Board

Shielded Wire

Wash Tank Thermistor

Booster Tank Thermistor

Booster Tank Water
Level Safet

Float Switch

Buzzer Output

1(CN1)41 (CN2)6

1

5

CN5

1

4

CN7

3
2

CN11

1

2

CN10

X1

X2

X3

X4

X5

X6

X7

CN3

CN4

2

1

X15

3

MC1

5

X10

7

MC3

1

X13

3

MC4

5

X14

Booster Tank Heater

Wash Tank Heater

Rinse Pump

Upper Wash Pump

Water Valve

Lower Wash Pump

Conveyor

Wash Tank Electrode
(Water Level Sensor)

Connector Voltages

5
6

CN9

1

CN6

Table Limit Switch + Conveyor Overload

Booster Tank Water Level Float Switch

Booster Tank Backup Water Level Float Switch

CN2 : 200VAC
CN3 : 12VDC
CN4 : 12VDC
CN5 : 5VDC
CN7 : 5VDC
CN8 : 12VDC
CN9 : 1-2: 6VAC

5-6: 12VDC

CN12

CN13

10

CN8

Wash Start Switch

Rinse Start Switch

CN10 : 12VDC
CN11 : 12VDC

*1 Connectors CN 1 - 4 are VH Connectors

17

4. Operation Panel Layout

The operation panel is mounted

on top of the unit (wash compartment exit side) and is

connected to the CN5 connector on the control board.

Water Temperature
Lamps

"AUTO FILL" Lamp

"READY" Lamp

"WASH" Lamp

Up Button

Down Button

Display

"CHANGE" Button

"ON/OFF" Button

5. Features

a) Display

This operation board uses an LED display to show system details and diagnostic
information.

b) Service Menu and Error Log

A service menu ("01" to "19" and "21" to "25") allows for viewing and setting of system
operating details and parameters. See "II.F.7. Service Menu and Error Log."

c) Error Codes

Error codes ("A1" to "A3," "H1" to "H6," "L1," "L2," "b1," "b2," "o1," "o2") are designed to
protect the unit. These codes give information or warnings in the event the unit is operating
out of acceptable parameters. See "III.B. Error Codes."

6. Controls, Adjustments, and Lamps

a) Water Temperature Lamps

Light up to indicate the water temperature shown in the display.

b) "AUTO FILL" Lamp

Flashes during the auto fi ll cycle, and goes off at the end of the cycle.

18

"READY" Lamp

c)

Lights up when the auto fi ll cycle completes and the dishwasher is ready to wash.

"WASH" Lamp

d)

Lights up during washing operation.

e) Up Button, Down Button

Indicates the total hours of operations in six digits by two digits each time.
Example: 123,456 hours are indicated by
Press to stop the beep in case of error.
Service personnel also use these buttons to change the controller settings.

f) Display

Indicates wash water temperature in wash cycle, rinse water temperature in rinse cycle,
and error codes in case of trouble.

"CHANGE" Button

g)

Press to change the wash water temperature shown in the display to the rinse water
temperature.

"ON/OFF" Button

h)

Turns on/off the power for operation.

i) Conveyor Speed Switch

Located on front panel. Changes the rack conveyor speed in three levels (high = 240
racks/hour, medium = 200 racks/hour, low = 160 racks/hour).

7. Service Menu and Error Log

The service menu ("01" to "19" and "21" to "25") may be used to change settings, acquire
diagnostic information, and to view error history.

a) Service Menu Access

• Enter Service Menu: Use the "ON/OFF" button to turn off the unit. Press and hold the
"CHANGE" button, then press the "ON/OFF" button. "01" should appear on the display.

• Scroll: Use the up and down arrow buttons to scroll through the service menu list, settings,
and data.

• View Service Menu Setting: Press the "CHANGE" button to view the selected menu
setting.

• Change Setting: Use the up and down arrow buttons to change the setting value.

• Return to Service Menu List: Press the "CHANGE" button once again to return to the main
service menu list.

• Exit Service Menu and Save Settings: Press the "ON/OFF" button to exit the service menu
and save the settings. The display goes blank.

19

b) Service Menu Chart

Service

Menu

01 Extended Wash Cycle Time 1 to 99 seconds

02 Extended Rinse Cycle Time 1 to 99 seconds

03 Auto Fill Cycle Rinse Time 0 to 99 minutes

04 Wash Temperature Setpoint Fahrenheit 32 to 176

05 Rinse Temperature Setpoint Fahrenheit 32 to 185

06 Booster Tank Heating Time 0 to 99 seconds

07 Supplementary Fill Cycle Time 0 to 990 seconds

08 Booster Tank Auto Fill Delay Time 0 to 99 seconds

09 Water Temperature Display ON: wash water temperature

10 Booster Tank Auto Fill Timer 1 to 99 minutes

11 Booster Tank Temperature Correction Fahrenheit 0 to 9R

12 Water Temperature Display Change ON: alternate

13 Temperature Display Scale Fahrenheit or Celsius
14 Water Temperature Display Change

Cycle Time

15 Low Water Temperature Lock Function ON: lock function on

16 Wash Tank Refi ll Alert ON: alert on

17 Total Operation Time Before Alert 10 to 600 minutes 1 to 60 12 (2h)
18 Display Hold Function ON: stays on

19 Power Supply Lock Function ON: "Ch" keeps fl ashing until

21

Error Log

through

Note: To erase the log, press and hold the

25

up and down buttons for 3 seconds with
one of the error codes displayed. The unit
beeps once and the entire log clears.

Item and Details Setting Range Display

1 to 99 30

(in 10 second steps)

1 to 99 15

(in 1 second steps)

0 to 99 13

(in 1 minute steps)

°F

(in 1

°F steps)

Celsius 0 to 80

(in 1°

(in 1

Celsius 0 to 85

(in 1°

(in 10 second steps)

(in 10 second steps)

(in 1 second steps)

OFF: rinse water temperature

(in 1 minute steps)

(in 1

Celsius 0 to 5K

(in 1K steps)

OFF: fi xed

1 to 10 seconds
(in 1 second steps)

OFF: lock function off

OFF: alert off

OFF: goes off after preset time

electrode is turned off
OFF: "Ch" goes off when "ON/
OFF" button is switched off

NA Most Recent

°

C steps)

°F

°F steps)

°

C steps)

R steps)

32 to 176 163

0 to 80 73

32 to 185 185

0 to 85 85

0 to 99 0

0 to 99 450

0 to 99 10

on or oF on

1 to 99 20

0 to 9 0

0 to 5 0

on or oF on

°F or °C °F

1 to 10 5

on or oF oF

on or oF oF

on or oF oF

on or oF oF

Errors
21 is most recent.
"--" is displayed if
the log is empty.

Factory

Default

NA

20

8. Temperature Display

• Indicates the average water temperature read by the wash tank or booster tank thermistor.
Indicates water temperature selected by the water temperature lamps beside the display.
The factory default setting is to indicate wash water temperature and rinse water temperature
alternately every 5 seconds. To adjust the display change cycle time, or to fi x the temperature
display for either wash or rinse water temperature and indicate the other temperature while
the "CHANGE" button is pressed, see service menu items 09, 12 and 14 in "II.F.7.b) Service
Menu Chart."

• The temperature display range is 32°F to 199°F (0°C to 99°C). To change the display scale,
see "Temperature Display Scale" (service menu item 13) in "II.F.7.b) Service Menu Chart."

• The temperature display updates every 5 seconds for the wash tank and the booster
tank.

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."

Error Codes

A1

Wash Tank Auto Fill Error

A2

Booster Tank Auto Fill Error

A3

Wash Tank Water Level Error

Booster Tank Water Level Error 1

o1

(Booster Tank Water Level Float Switch Closed)

Booster Tank Water Level Error 2

o2

(Booster Tank Water Level Float Switch Open)

H1

Wash Tank Thermistor Error (short)

H2

Wash Tank Thermistor Error (open)

H3

Booster Tank Thermistor Error (short)

H4

Booster Tank Thermistor Error (open)

H5

ROM/RAM Error

H6

EEPROM Error

L1

Conveyor Overload or Table Limit Error 1

L2

Conveyor Overload or Table Limit Error 2

b1

Booster Tank Error

b2

Booster Tank Water Level Safety Error

10. Buzzer

• At the end of an auto fi ll cycle or other mode operation, the buzzer turns on for 0.1 second
and off for 0.1 second 10 times.

• In case of an error, the buzzer turns on for 0.1 second and off for 0.9 second repeatedly
until the error is reset. To turn off the beep, press the down button.

• When a button is pressed, the buzzer turns on for 0.1 second.

• To adjust the buzzer volume, use the volume control on the control board.

21

11. Operation Time Display

To indicate the total hours of operation in the display, press the up button on the operation
panel. The number appears from the hundred-thousands place by two digits each for 1
second. The maximum number is 999,999 hours, and the display does not change for the
higher numbers.

Example: 19,302 hours are indicated as

12. Special Modes

OFF OFF

a) Continuous Wash Mode

The continuous wash mode (also used when descaling) allows the wash pump motor to
run continuously. In this mode, the wash tank heaters and booster tank heaters remain de­energized.
To enter the continuous wash mode, use the "ON/OFF" button to turn off the unit. Press
and hold the up and down buttons and the "CHANGE" button for 3 seconds and press the
"ON/OFF" button. As long as the service panel switch and wash tank water level sensor are
closed, the wash pump motor runs

and power is supplied to the detergent feeder terminals.

"PC" (preventative cleaning) appears in the display and the lamps are off.
To cancel the continuous wash mode, press the "ON/OFF" button.

b) Low Water Temperature Lock Function

To ensure the NSF specifi ed minimum wash water temperature of 160°F, this unit is provided
with a function to lock the washing operation until water in the wash water tank reaches 160°F

even if a rack is loaded (factory default: OFF).
To activate this function, set service menu item 15 to "ON" referring to "II.F.7.a) Service Menu

Access." The minimum temperature of 160°F cannot be changed.

c) Alert Function

To keep water in the wash water tank clean, this unit is provided with functions to beep and
fl ash "Ch" (= Change) in the display when wash water should be changed and to continue
this alert until the wash water tank is refi lled (factory default: OFF).
To activate this function, set service menu items 16, 17, 18 and 19 referring to "II.F.7.a)
Service Menu Access."

1) Set service menu item 16 to ON to activate this function (factory default: OFF).

2) Set service menu item 17 to the desired total operation time before alert [number in display

x 10 minutes] (factory default: 12 (2 hours)). Change this setting according to the advice
of the relevant health department and customer demands.

3) Set service menu item 18 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.

22

4) Set service menu item 19 to ON to stop the beep when the "ON/OFF" button is switched

off but to resume fl ashing "Ch" when the "ON/OFF" button is switched back on unless the
wash water tank is refi lled (factory default: OFF). Press the emergency stop button or turn
off the external power supply to stop both the beep and "Ch" indication.

Set service menu item 19 to OFF to stop both the beep and "Ch" indication once the "ON/

OFF" button is switched off.

If service menu item 19 is set to ON, "Ch" keeps fl ashing even if service menu item 18 is

set to OFF.

Alert Function Setting Flow

Wash Tank Refi ll Alert

Total Operation Time
Before Alert

Display Hold Function

Service Menu 16

ON

Service Menu 17

1 to 99

Service Menu 18

ON

Set service menus
17 to 19

Alert starts after number in display
(1 to 99) x 10 minutes
[factory default: 12 (2 hours)]

"Ch" keeps fl ashing
(until "ON/OFF" button is switched off)

OFF

* OFF

Alert function OFF
[factory default]

"Ch" goes off after 10 minutes
[factory default]

Power Supply Lock
Function

Service Menu 19

* ON

* "Ch" keeps fl ashing even if

service menu 18 is set to OFF

Switching off "ON/OFF" button cancels beep
but not "Ch" until wash water tank is refi lled

23

OFF

Beep stops and "Ch" goes off when
"ON/OFF" button is switched off
[factory default]

III. Service Diagnosis

WARNING

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.

3. Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.

4. Do not make any alterations to the unit. This could cause water leak, electric
shock, or fi re.

5. To help reduce the risk of electric shock, do not touch switches with damp
hands.

A. Diagnostic Procedure

The diagnostic procedure is a sequence check of the switches and sensors while operating
the unit, by using the switch open/closed display mode.

Switch Open/Closed Display Mode

The switch open/closed display mode indicates when the wash start switch, rinse start switch,
wash tank water level sensor, booster tank water level fl oat switch, and booster tank backup
water level fl oat switch are open or closed.
To enter the switch open/closed display mode, use the "ON/OFF" button to turn on the
unit. Press and hold the up and down buttons for 3 seconds. The following appears in the
display:

Load a rack to engage the wash start switch and start a cycle. The display indicates whether
a switch is open or closed. When a switch is closed, its corresponding segment is illuminated
in the display. See the illustration below.
To resume the normal display, press the down button.

Booster Tank Backup Water Level Float Switch

Wash Start Switch

Booster Tank Water Level Float Switch

Rinse Start Switch

Wash Tank Water Level Sensor

24

It is recommended to conduct this sequence check in the auto fi ll cycle after draining the
wash tank and booster tank. See “II.C. Sequence of Operation” for further details.

1) Use the “ON/OFF” button on the operation panel to turn off the unit.

2) Pull out the overfl ow pipe to drain the wash tank.

3) Drain the booster tank through the drain hose.

4) Replace the overfl ow pipe and drain hose in their correct positions.

5) Enter the switch open/closed display mode according to the above procedure.

6) Auto Fill Cycle
a. After the service panel is closed and the “ON/OFF” button is pressed, the inlet water

valve in the booster tank opens in 10 seconds to start water supply.

b. After a while, the booster tank water level float switch closes, segment C in the

display comes on, and the inlet water valve closes to stop water supply.

c. The rinse pump starts to feed water to the wash tank. When the booster tank water

level goes down, the water level fl oat switch opens, segment C in the display goes
off, and the inlet water valve opens to start water supply.

d. After the rinse pump is energized for a preset time to fi ll the wash tank, the wash

tank water level sensor closes, and segment E in the display comes on.

e. In normal operation, the booster tank backup water level fl oat switch does not close,

and segment A in the display stays off. If the booster tank water level fl oat switch
fails or the booster tank water level reaches the overfl ow level, segment A comes on.

7) Wash Cycle/Rinse Cycle
a. When a rack is loaded from the wash compartment entrance and the wash start

switch closes, segment B in the display comes on and the wash pump starts the
wash cycle for a preset time. When the conveyor moves the rack forward and the
wash start switch opens, segment B goes off and the wash pump stops after the
preset time. Segment E in the display stays on.

b. If the booster tank is below the predetermined water level, segment C in the display

stays off. The inlet water valve stays open until segment C comes on.

c. When the wash cycle ends and the rinse start switch closes, segment D in the

display comes on and the rinse pump starts the rinse cycle for a preset time. When
the rinse start switch opens, segment D goes off and the rinse pump stops after the
preset time. When the rinse cycle starts, the booster tank water level goes down and
segment C in the display goes off. The inlet water valve stays open until segment C
comes on.

Diagnosis: If any problem is found by the above sequence check, refer to “III.B. Error

Codes,” “III.C. Service Flow Charts,” “III.D. Float Switch Check and Cleaning” and “III.E.
Thermistor Check.”

25

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

Code

A1

A2

A3

o1

Problem Operation Reset

Wash Tank Auto Fill Error

Water level in wash tank does not reach
water level sensor after rinse pump has
run for preset time.

Booster Tank Auto Fill Error

In auto fi ll cycle, booster tank water level
fl oat switch does not close within 10
minutes (or 20 minutes in "READY" mode)
after inlet water valve is opened.

Wash Tank Water Level Error

Water level in wash tank goes below water
level sensor in "READY" mode or during
operation.

Booster Tank Water Level Error 1 (Booster
Tank Water Level Float Switch Closed)

Both booster tank water level fl oat switch
and booster tank backup water level fl oat
switch have remained closed for 1 minute.

Booster Tank Water Level Error 2 (Booster
Tank Water Level Float Switch Open)

Whole unit
stops

Whole unit
stops

Supplementary
fi ll cycle starts
(Whole unit
stops if water
level sensor
does not
close after two
cycles)

Whole unit
stops

Whole unit
stops

Use "ON/OFF" button to turn the unit
off and then back on.

Use "ON/OFF" button to turn the unit
off and then back on.

After supplementary fi ll cycle ends,
alarm resets.
(If whole unit stops, use "ON/OFF"
button to turn the unit off and then
back on.)

Use "ON/OFF" button to turn the unit
off and then back on.

Use "ON/OFF" button to turn the unit
off and then back on.

o2

Booster tank water level fl oat switch is
open and booster tank backup water
level fl oat switch has remained closed for
1 minute.

Wash Tank Thermistor Error (short)

H1

Thermistor senses abnormal temperature
(at or above 231°F (110°C)).

Wash Tank Thermistor Error (open)

H2

Thermistor senses abnormal temperature
(at or below -6°F (-21°C)).

Booster Tank Thermistor Error (short)

H3

Thermistor senses abnormal temperature
(at or above 231°F (110°C)).

Normal
(Wash tank
heaters off)

Normal
(Wash tank
heaters off)

Normal
(Booster tank
heaters off)

26

After replacing failed component,
alarm resets.

After replacing failed component,
alarm resets.

After replacing failed component,
alarm resets.

Error
Code

H4

H5

H6

L1

L2

b1

b2

Problem Operation Reset

Booster Tank Thermistor Error (open)

Thermistor senses abnormal temperature
(at or below -6°F (-21°C)).

ROM/RAM Error

Control board ROM/RAM fails.
EEPROM Error

EEPROM fails.
Conveyor Overload or Table Limit Error 1

Inverter sends conveyor overload signal or
table limit switch closes.

Conveyor Overload or Table Limit Error 2

After unit stops with "L1" error and restarts,
another error signal is sent within 3
seconds.

Booster Tank Error

Booster tank error output contacts open.
Booster Tank Water Level Safety Error

Booster tank water level safety fl oat switch
opens after booster tank water level fl oat
switch closes.

Normal
(Booster tank
heaters off)

Whole unit
stops

Whole unit
stops

Unit stops After error signal stops, alarm resets.

Whole unit
stops

Normal After booster tank error is resolved,

Whole unit
stops

After replacing failed component,
alarm resets.

After replacing control board, alarm
resets.

After replacing control board, alarm
resets.

Use "ON/OFF" button to turn the unit
off and then back on.

alarm resets.

Use "ON/OFF" button to turn the unit
off and then back on.

2. Error Code Log

Use the "ON/OFF" button to turn off the unit. Press and hold the "CHANGE" button, then
press the "ON/OFF" button. "01" should appear on the display. Use the down arrow button to
scroll to service menu items 21 through 25. 21 is the most recent error. Press the "CHANGE"
button to view the selected service menu item. Press the "CHANGE" button once again to
return to the main service menu list. If no errors exist in the log, "--" is displayed.
Press the "ON/OFF" button to exit the service menu. The display goes blank.
To erase the log, press and hold the up and down buttons for 3 seconds with one of the error
codes displayed. The unit beeps once and the entire log clears.

27

3. Error Code Details

r

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.

• To reset, use the "ON/OFF" button to turn the unit off and then back on.

• See the chart below for possible causes and remedies.



Code Error





A 1





Wash tank water level sensor is open at the end
of the auto fill cycle.

Item Possible Cause Remedy

Overflow Pipe

Wash Tank Water Level

Senso

Out of position. Set in position.

Heavy scale or soil
buildup.

Connector not properly
connected.

Open circuit. Repair or replace.

Defective. Replace.

Operation

Unit stops.

Clean.

Reconnect.

Continue

Rinse Pump

Control Board

Open circuit. Repair or replace.

Control relay
defective.

Defective. Replace.

Improper setting. Readjust.

Connector not properly
connected.

Defective. Replace.

Replace.

Reconnect.

28

Continue

Booster Tank Water

Level Float Switch

Sticking (with float in
“ON” position).

Defective (with internal
contacts in “ON”
position).

Check and clean. See
“III.D. Float Switch
Check and Cleaning.”

Replace.

29

b) Booster Tank Auto Fill Error (A2)

• In the auto fi ll cycle, if the booster tank water level fl oat switch does not close within 10 minutes

(or 20 minutes in "READY" mode) after the cycle starts, the unit shuts down, "A2" appears
in the display, and the buzzer sounds.

• To reset, use the "ON/OFF" button to turn the unit off and then back on.

• See the chart below for possible causes and remedies.





Code Error



A 2

Booster tank water level float switch does not
close within 10 minutes (or 20 minutes in
“READY” mode) after the auto fill cycle starts.

Item Possible Cause Remedy

Booster Tank

Not ready for
operation.

Operation

Unit stops.

Get it ready.

Strainer

Water Valve

Booster Tank Water

Level Float Switch

Water supply pressure
too low.

Filter clogged. Clean.

Open circuit. Repair or replace.

Filter clogged. Clean.

Defective. Replace.

Connector not properly
connected.

Open circuit. Repair or replace.

Readjust.

Reconnect.

Control Board

Sticking.

Connector not properly
connected.

Defective. Replace.

Check and clean. See
“III.D. Float Switch
Check and Cleaning.”

Reconnect.

30

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

during operation, the supplementary fi ll cycle starts, "A3" appears in the display, the "AUTO
FILL" lamp fl ashes, and the buzzer sounds three times only at the beginning.

•

If the wash tank water level sensor is closed after the supplementary fi ll cycle, the alarm
resets. If the wash tank water level sensor is still open after the supplementary fi ll cycle,
another cycle starts.

If the wash tank water level sensor is closed after the second cycle, the alarm resets. If the

wash tank water level sensor still does not close after the second cycle, the buzzer sounds,
and the unit completely shuts down.

• See the chart below for possible causes and remedies.





Code Error





A 3

Wash tank water level sensor opens in
“READY” mode or during operation.

Item Possible Cause Remedy

Operation

Auto fill cycle starts.

Overflow Pipe

Wash Tank Water Level

Sensor (Wash Tank

Electrode

Control Board

Out of position. Set in position.

Heavy scale or soil
buildup.

Connector not properly
connected.

Open circuit. Repair or replace.

Defective. Replace.

Connector not properly
connected.

Defective. Replace.

Clean.

Reconnect.

Reconnect.

Auto Fill Cycle

Water level too low.

See “A1.”

31

d) Booster Tank Water Level Error 1 (Booster Tank Water Level Float Switch Closed)

(o1)

• If both the booster tank water level fl oat switch and the booster tank backup water level

fl oat switch have remained closed for 1 minute, the booster tank heaters de-energize, "o1"

appears in the display, and the buzzer sounds.

• The error resets if the booster tank backup water level fl oat switch opens or when the "ON/

OFF" button is used to turn the unit off and then back on.

• See the chart below for possible causes and remedies.





Code Error





o 1

























Booster tank water level float switch and booster
tank backup water level switch have remained
closed for 1 minute.

Item

Water Valve

Booster Tank Water

Level Float Switch

Control relay contacts
fused.

Defective. Replace.

Sticking.

Possible Cause

Operation

Unit stops.

Remedy

Replace.

Check and clean. See
“III.D. Float Switch
Check and Cleaning.”

Defective. Replace.

Booster Tank Backup

Water Level Float

Switch

Control Board

Sticking.

Defective. Replace.

Defective. Replace.

Note: See “III.D. Float Switch Check and Cleaning.”

Check and clean. See
“III.D. Float Switch
Check and Cleaning.”

32

e) Booster Tank Water Level Error 2 (Booster Tank Water Level Float Switch Open)

(o2)

• If the booster tank water level fl oat switch is open and the booster tank backup water level

fl oat switch has remained closed for 1 minute, the booster tank heaters de-energize, "o2"

appears in the display, and the buzzer sounds.

• The error resets if the booster tank backup water level fl oat switch opens or when the "ON/

OFF" button is used to turn the unit off and then back on.

• See the chart below for possible causes and remedies.





Code Error



o 2

Booster tank water level float switch is open and
booster tank backup water level switch has
remained closed for 1 minute.

Item Possible Cause Remedy

Operation

Unit stops

Booster Tank Water

Level Float Switch

Booster Tank Backup

Water Level Float

Switch

Control Board

Sticking.

Open circuit. Repair or replace.

Defective. Replace.

Sticking.

Defective. Replace.

Connector not properly
connected.

Defective. Replace.

Check and clean. See
“III.D. Float Switch
Check and Cleaning.”

Check and clean. See
“III.D. Float Switch
Check and Cleaning.”

Reconnect.

Note: See “III.D. Float Switch Check and Cleaning.”

33

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: The auto fi ll cycle and the wash/rinse cycle will start even after this error occurs.









H 1 / H 2

Code Error

Thermistor senses abnormal temperature.

Item Possible Cause Remedy

Operation

Continues (wash tank

heater off).

Thermistor

Control Board

Connector not properly
connected.

Open circuit (H2). Replace.

Short circuit (H1). Replace.

Defective. Replace.

Connector not properly
connected.

Defective. Replace.

Reconnect.

Reconnect.

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

34

g) Booster Tank Thermistor Error (H3, H4)

• If the booster tank thermistor senses a temperature at or above 231°F (111°C) (2.4kΩ), the

thermistor leads are considered shorted and the booster tank heaters de-energize, "H3"
appears in the display, and the buzzer sounds.

• If the booster tank thermistor senses a temperature at or below -6°F (-21°C) (517kΩ),

the thermistor leads are considered open and the booster tank heaters de-energize, "H4"
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: The auto fi ll cycle and the wash/rinse cycle will start even after this error occurs.









H 3 / H 4



Code Error

Thermistor senses abnormal temperature.

Item Possible Cause Remedy

Operation

Continues (booster

tank heater off).

Thermistor

Control Board

Connector not properly
connected.

Open circuit (H4). Replace.

Short circuit (H3). Replace.

Defective. Replace.

Connector not properly
connected.

Defective. Replace.

Reconnect.

Reconnect.

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

35

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 Error

H 5

ROM/RAM on control board fails.

Item Possible Cause Remedy

Defective. Replace.

Control Board

Operation

Unit stops.

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 Error

H 6

EEPROM on control board fails.

Item Possible Cause Remedy

Defective. Replace.

Control Board

Operation

Unit stops.

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

36

j) Conveyor Overload or Table Limit Error 1 (L1)

• If the inverter sends an overload signal or the table limit switch closes, the unit shuts down,

"L1" appears in the display, and the buzzer sounds.

• After removing the jammed rack or the cause of the overload (the table limit switch opens

or the inverter stops sending the overload signal), the alarm resets after 3 seconds, and
the unit is ready to resume operation.

If the wash start switch is closed when the alarm resets, the upper spray arm wash pump

starts fi rst, followed by the lower spray arm wash pump, then the conveyor moves.

If the rinse start switch is closed when the alarm resets, the rinse pump starts, then the

conveyor moves.

The heaters stay energized while the unit is off with "L1."

• See the chart below for possible causes and remedies.



Code Error

Inverter sends conveyor overload signal or table

L 1

limit switch closes.

Item Possible Cause Remedy

Conveyor

Gear Motor

Inverter

Table Limit Switch

Jammed. Remove obstacle.

Defective (not moving
smoothly).

Defective. Repair or replace.

Defective. Repair or replace.

Clean dishtable filled
with racks.

Operation

Unit stops.

Repair.

Remove racks.

Stays closed with reed
switch defective or
magnet off.

37

Repair or replace.

k) Conveyor Overload or Table Limit Error 2 (L2)

• If the unit shuts down with "L1" in the display and restarts in 3 seconds after the cause of

the overload is removed, and the inverter sends another overload signal within 3 seconds
after the conveyor moves, the unit completely shuts down, "L2" appears in the display, and
the buzzer sounds.

• To reset, use the "ON/OFF" button to turn the unit off and then back on.

If the unit shuts down with a conveyor overload error, the error signal from the inverter is

reset, and the unit restarts after 3 seconds. If the cause of the overload (e.g. dish caught in
conveyor) has not been removed by then, the unit starts and stops repeatedly. To prevent
this repetition, if the same error occurs within 3 seconds, the unit remains shut down.

If the unit shuts down with the table limit switch closed, the unit restarts after one or more racks

are removed, and the table limit switch does not normally close again within 3 seconds.

• See the chart below for possible causes and remedies.



Code Error

Inverter sends another conveyor overload signal

L 2

or table limit switch closes again within 3
seconds after “L1” error resets and unit restarts.

Item Possible Cause Remedy

Jammed. Remove obstacle.

Conveyor

Defective (not moving
smoothly).

Defective. Repair or replace.

Gear Motor

Defective. Repair or replace.

Inverter

Improper operation. Instruct operator.

Table Limit Switch

Operation

Unit stops.

Repair.

Defective. Repair or replace.

38

l) Booster Tank Error (b1)

• If the booster tank error input contacts stay open for more than 2 seconds, "b1" appears in

the display, and the buzzer sounds.

• If the booster tank error input contacts stay closed for more than 2 seconds, the alarm

resets.

Note: The booster tank error input must be connected to indicate this error code.



Code Error

Booster tank sends error signal.

b 1

Item Possible Cause Remedy

Operation

Continues.

Booster Tank

Control Board

Connection Cable

Defective. Repair or replace.

Defective. Replace.

Open circuit. Repair or replace.

Connector not properly
connected.

Reconnect.

39

m) Booster Tank Water Level Safety Error (b2)

• If the booster tank water level safety fl oat switch opens after the booster tank water level

fl oat switch closes, the unit shuts down, "b2" appears in the display, and the buzzer sounds.

• To reset, use the "ON/OFF" button to turn the unit off and then back on.



Code Error

Booster tank water level safety float switch

b 2

opens after booster tank water level float switch
closes.

Item Possible Cause Remedy

Operation

Unit stops

Water Heater

Strainer

Water Valve

Booster Tank Water

Level Safety Float

Switch

Water supply pressure
too low.

Flow rate too low. Readjust.

Filter clogged. Clean.

Open circuit. Repair or replace.

Filter clogged. Clean.

Defective. Replace.

Open circuit or
connector not properly
connected.

Sticking.

Defective. Replace.

Readjust.

Repair or replace.

Check and clean. See
“III.D. Float Switch
Check and Cleaning.”

Control Board

Rinse Spray Arm

Pressure Reducing

Val ve

Rinse Water Level

Connector not properly
connected.

Defective. Replace.

Disconnected or water
leaks from joint.

Clogged. Clean.

Defective. Replace.

Insufficient water
supply.

Reconnect.

Reconnect.

Readjust.

40

C. Service Flow Charts

p

1. Unit Will Not Start

Unit will not start

Problem Possible Cause Remedy

Main Power Supply

Emergency Stop Button

ON/OFF Button

Power Failure

No Water Supply

Off, blown fuse, or
tripped or defective
circuit breaker.

Loose connection. Tighten.

Not within
specifications.

Pressed.

“OFF” position. Move to “ON” position.

Water failure. Wait for recovery.

Turn on, replace, or
check and reset. Call
electrician if breaker

s repeatedly.

tri

Refer to nameplate
and correct.

Turn clockwise to
reset.

Wait for recovery.

Continue

Service Panel

Service Panel Switch

Shut off valve closed. Open.

Strainer clogged. Clean.

Open. Close.

Out of adjustment
and/or open.

Adjust and/or replace.

41

Continue

Transformer

Wiring to Control Board

Control Board

Open coil winding. Replace.

Loose connections or
open.

In alarm.

Defective. Replace.

Check continuity and
repair or replace.

See “III.B. Error
Codes.”

42

2. Dishes Not Clean

Dishes not clean

Problem Possible Cause Remedy

Low Wash Pump

Output

Wash Spray Arms

Clogged with foreign
matter.

Voltage drop. Remove cause.

Vapor lock due to
clogged tank filter.

Vapor lock due to use
of neutral cleaner.

Wash pump defective. Replace.

Clogged.

Out of position.

Clean.

Clean tank filter.

Stop using neutral
cleaner.

Clean.

Set in position.

Continue

Filter

Dish Rack

Dishes

Low pump output.

Out of position. Place in position.

Clogged

Improperly loaded. Load correctly.

Excessively dirty. Prewash.

See “Low Wash Pump
Output”.

Clean.

43

Continue

pply

g

Detergent

No supply.

Insufficient supply.

Unspecified detergent
used.

Dirty.

Wash Tank Water

Temperature too low.

Temperature will not
rise.

Control output error.

Heater Not Energized

See “III.C.5. No or
Inadequate
Detergent/Rinse Aid

.”

Su

Refill or adjust
detergent feeder.

Use specified
detergent only.

Drain wash tank and
supply fresh hot water.

Raise setting or see
“Heater Not

ized”.

Ener

Reset overheat
thermostat.

Check input/output
and repair or replace.

Conveyor Speed

Voltage

Magnetic contactor
defective.

Overheat thermostat
tripped.

Too high.

Too low. Call electrician.

Replace.

Reset manually.

Replace. Defective.

Adjust to medium or
low.

44

3. Inadequate Rinse

Inadequate rinse

Problem Possible Cause Remedy

Low Rinse Pump

Output

Rinse Spray Arms

Clogged with foreign
matter.

Rinse water line
scaled.

Voltage drop. Remove cause.

Rinse pump defective. Replace.

Clogged.

Out of position.

Low pump output.

Clean.

Clean.

Clean.

Set in position.

See “Low Rinse Pump
Output.”

Dish Rack

Rinse (Booster Tank)

Water

Rinse Cycle Time

Voltage

Improperly loaded. Load correctly.

Temperature too low.

Too short. Adjust longer.

Too low. Call electrician.

Raise setting or see

“Heater Not

”

45

4. Dishwasher Will Not Start Wash/Rinse Cycle

Dishwasher will not start
wash/rinse cycle

Problem Possible Cause Remedy

Wash Pump Inoperative

Rinse Pump Inoperative

Protector tripped.

Locked with foreign
matter.

Controller input/output
error.

Magnetic contactor
defective.

Protector tripped.

Locked with foreign
matter/

Controller input/output
error.

Wait until wash pump
cools.

Remove obstacles.

Check input/output
and repair or replace.

Replace.

Wait until Rinse Pump
cools.

Remove obstacles.

Check input/output
and repair or replace.

Service Panel Magnet

Detection Error

Wash Start Switch

Rinse Start Switch

Relay defective. Replace.

Service panel not fully
closed.

Magnet out of position. Set in position.

Service panel switch
out of position.

Magnetic material
caught between
service panel and tank.

Defective. Replace.

Defective. Replace.

Close completely.

Set in position.

Remove.

46

5. No or Inadequate Detergent/Rinse Aid Supply

No or inadequate
detergent/rinse aid supply

Problem Possible Cause Remedy

Detergent/Rinse Aid

Supply Line (Injector,

Vinyl Hose, Strainer)

Detergent Pump

6. Wash Tank Water Boils

Wash tank water boils

Empty. Refill.

Clogged or kinked. Clean or straighten.

Air in line. Purge air.

Supply volume too
low.

Defective. Replace.

Set to proper volume.

Problem Possible Cause Remedy

Thermistor

Magnetic Contactor

Heater Control Relay

Control Board

Out of position. Set in position.

Disconnected (open). Reconnect.

Defective.

Contact fused. Replace.

Bad contacts.

Defective. Replace.

See “III.E. Thermistor
Check.”

Check for continuity
and replace.

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

47

7. Wash Tank Water Not Draining

Wash tank water not
draining

Problem Possible Cause Remedy

Drain Hose

Drain Pipe

(Overflow Pipe)

Clogged. Unclog.

Pinched. Correct.

Raised. Correct.

Clogged. Unclog.

48

D. Float Switch Check and Cleaning

(for Booster Tank Water Level Float Switch and Backup Water Level Float Switch)

If an abnormal input signal is found by “III.A. Diagnostic Procedure” or the error code “o1” or
“o2” is displayed, check and clean/replace the fl oat switches according to the procedure below.

1. Float Switch Check

To check the fl oat switches, follow the steps below.

1) Use the “ON/OFF” button on the operation panel to turn off the unit, then turn off the
dishwasher and booster tank power supplies. Lockout/Tagout to prevent the power supplies
from being turned back on inadvertently.

2) Remove the front panel and top panel of the booster tank.

3) Remove the control box cover, and disconnect the CN8 connector from the control board
(see “II.F.2. Control Board Layout”).

4) To check the booster tank water level fl oat switch, check for continuity across the orange
and red wires (#1 and #2) on the CN8 connector. Confi rm that the fl oat switch is open
when the fl oat is down and closed when the fl oat is up.

5) To check the booster tank backup water level fl oat switch, check for continuity across the
pink and light blue wires (#3 and #4) on the CN8 connector. Confi rm that the fl oat switch
is open when the fl oat is down and closed when the fl oat is up.

6) If any problem is found, repair or replace the fl oat switch.

7) If the fl oat switch is scaled up or dirty, clean it according to “2. Float Switch Cleaning.”

2. Float Switch Cleaning

Depending on local water conditions, scale may build up on the fl oat switches. Scale on the
switches can cause the fl oats to stick. In this case, the fl oat switches should be cleaned.

1) Use the “ON/OFF” button on the operation panel to turn off the unit, then turn off the
dishwasher and booster tank power supplies. Lockout/Tagout to prevent the power supplies
from being turned back on inadvertently.

2) Remove the front panel and top panel of the booster tank.

3) Use a soft brush to remove scale or soil on the fl oat switches, or wipe down the fl oat
switches with a mixture of 1 part of Hoshizaki “Scale Away” and 25 parts of warm water.

4) Rinse the parts thoroughly with clean water.

5) If the fl oat switch is removed, replace it in its correct position. Be careful not to confuse
the positions and directions of the booster tank water level fl oat switch and the booster
tank backup water level fl oat switch. Make sure the fl oats can move freely in the vertical
directions (see “II.A.2. Booster Tank”).

6) Replace the booster tank panels.

49

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)
thermistor(s) according to the procedure below. If replacement is required, see “IV.H.
Removal and Replacement of Thermistor.”

1) Use the “ON/OFF” button on the operation panel to turn off the unit, then turn off the
dishwasher and booster tank power supplies. Lockout/Tagout to prevent the power supplies
from being turned back on inadvertently.

2) Remove the front panel, then pull out the control box.

3) Remove the control box cover, then disconnect the CN7 connector from the control board
(see “II.F.2. Control Board Layout”).

4) To check the wash tank thermistor, check the resistance across the white wires (#1 and
#2). To check the booster tank thermistor, check the resistance across the pink wires (#3
and #4). See the table below for proper resistance and temperature relations.

Temperature [°F (°C)]

194 (90)
176 (80)
158 (70)
140 (60)
104 (40)

68 (20)

32 (0)

] appears in the display, or the wash tank water boils, check the

Resistance [kΩ]

4.30 to 4.62

5.87 to 6.38

8.13 to 8.96

11.5 to 12.8

24.3 to 28.0

56.3 to 67.1

145.6 to 180.6

5) If any problem is found, replace the thermistor according to “IV.H. Removal and Replacement
of Thermistor.”

50

IV. Removal and Replacement of Components

WARNING

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.

Use the “ON/OFF” button on the operation panel to turn off the unit, then

2.

turn off the dishwasher and booster tank power supplies. Lockout/Tagout to
prevent the power supplies from being turned back on inadvertently.

3. When draining the booster tank, wait until the water temperature falls below
104°F (40°C) to avoid possible burns.

4. To avoid possible burns and spills, be sure to drain the wash tank and
booster tank and let the components cool before servicing.

5. When disassembling components that have been in contact with detergent,
wear rubber gloves and goggles. Before starting disassembly, thoroughly
read the detergent safety instructions. Contact with skin may cause irritation
and contact with eyes may cause blindness.

6. When reassembling components, be sure to use new O-rings and gaskets.

A. Removal of Panels

1) The front panel 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.
Note: The side panel at the booster tank side is not removable.

2) To replace, reverse the above procedure.

B. Removal and Replacement of Wash Pump Motors

To remove:

Use the “ON/OFF” button on the operation panel to turn off the unit, then turn off the

1)

dishwasher and booster tank power supplies. Lockout/Tagout to prevent the power
supplies from being turned back on inadvertently.

2) Drain the wash tank.

3) Remove the front panel.

4) Remove the fan motors.

5) Disconnect the wash pump motor wiring at the closed end connectors.

6) Remove the bands, and disconnect the wash pump motors from the tank discharge
outlets and suction inlets.

7) Loosen the wash pump motor bracket mounting screws to remove the wash pump
motors together with the brackets.

8) Remove the pump plugs and the brackets from the wash pump motors.

To replace:

Note: Be sure to use new O-rings and gaskets.

1) Attach the brackets and the pump plugs to the wash pump motors.

2) Fit the O-rings to the wash pump motor discharge outlets and suction inlets.

3) Hook the brackets on the mounting screws left on the unit.

51

4) Make sure the O-rings are in place, and attach the wash pump motors to the tank
discharge outlets and suction inlets. Secure the connections with the bands.

5) Tighten the bracket mounting screws.

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.

7) Connect the wiring. When finished, cover the connections with the original plastic
sheet cover and secure with a nylon tie. Make sure the connections are situated so
that water and condensation cannot reach the connections.
Note: Be careful not to mix up the wire colors. Miswiring will cause reversal of the

pump motor, resulting in improper operation.

8) Replace the front panel.

9) Make a trial run, and check for water leaks.

Fan Motor

Bracket

Pump Plug

Wash Pump Motor
(Lower Spray Arm)

Fan Motor

Band

O-Ring

Wash Pump Motor
(Upper Spray Arm)

C. Removal and Replacement of Rinse Pump Motor

1) Use the “ON/OFF” button on the operation panel to turn off the unit, then turn off the

dishwasher and booster tank power supplies. Lockout/Tagout to prevent the power
supplies from being turned back on inadvertently.

2) Remove the front panel.

3) Use the booster tank drain hose to drain the booster tank. WARNING! To avoid

possible burns, allow the rinse water temperature to fall below 104°F (40°C)
before draining.

4) The rinse pump motor is located at the rear right side of the machine compartment
(JWE-2400CUA-L-25B) or located behind the control box and at the rear left side of
the machine compartment (JWE-2400CUA-R-25B).

5) Remove the fan motor in front of the rinse pump motor.

52

6) Disconnect the rinse pump motor wiring at the closed end connectors.

7) Remove the nut from the fl exible tube at the rinse pump motor discharge outlet and
the bolts securing the bracket to the unit base.

8) Remove the band from the pipe joint of the booster tank discharge pipe behind the
rinse pump motor and the fl exible tube at the rinse pump motor suction inlet. Pull the
end of fl exible tube out of the booster tank discharge pipe.
Note: Use a hand mirror for easy removal.

9) Remove the rinse pump motor together with the bracket. Remove the band from the
pipe joint of the rinse pump motor suction inlet pipe and fl exible tube to release the
fl exible tube.

10) Unscrew the bracket, and remove the rinse pump motor.

11) To replace, reverse the above procedure.
Note:

1. Be careful not to mix up the wire colors. Miswiring will cause reversal of the pump

motor, resulting in improper operation.

2. Cover the connections with the original plastic sheet cover and secure with a nylon

tie. Make sure the connections are situated so that water and condensation cannot
reach the connections.

3. Be sure to use new O-rings and gaskets. Be careful of the direction of the

U-packing for the suction inlet pipe.

12) Make a trial run, and check for water leaks.

Rinse Pump Motor

[JWE-2400CUA-L-25B]

* For JWE-2400CUA-R-25B, fan motor and rinse

pump motor are located behind control box

Flexible Tube

Sunction Inlet Pipe

U-Packing

Discharge
Outlet Nut

Booster Tank
Drain Hose

Rinse Pump Motor

Fan Motor

53

[JWE-2400CUA-L-25B]

* View without rinse pump motor

Band

Flexible Tube

Booster Tank
Discharge Pipe

Rinse Pump MotorRinse Pump Motor Suction Inlet

Rinse Pump Motor Suction Inlet
Flexible Tube

Band

Booster Tank
Discharge Pipe

54

D. Removal and Replacement of Gear Motor

1) Use the “ON/OFF” button on the operation panel to turn off the unit, then turn off the

dishwasher and booster tank power supplies. Lockout/Tagout to prevent the power
supplies from being turned back on inadvertently.

2) Remove the front panel.

3) The gear motor is located behind the control box and at the rear left side of the
machine compartment (JWE-2400CUA-L-25B) or located at the rear right side of the
machine compartment (JWE-2400CUA-R-25B).

4) Disconnect the gear motor wiring at the closed end connectors.

5) Remove the bolts securing the bracket to the unit base and the nuts securing the
bracket to the wash tank.

6) Loosen the 2 hexagon socket set screws for the coupling.

7) Slide up the coupling, and remove the gear motor together with the bracket.

8) Remove the gear motor from the bracket.

9) To replace, reverse the above procedure.
Note:

1. Fit the coupling securely on the gear motor shaft.

2. Apply a thread sealant to the hexagon socket set screws, and tighten them

securely.

3. Align the gear motor shaft with the crankshaft from the wash tank.

4. Be careful not to mix up the wire colors.

10) Make a trial run, and check for water leaks.

Nut

Bracket

Bracket
(Wash Tank)

Flinger

Coupling

Hexagon Socket
Set Screw

Gear Motor

Bolt

55

E. Removal and Replacement of Conveyor

1) Remove the 4 bolts (2 at rear, 2 at both sides) securing the rear rack rail.

2) Hold the conveyor, and lift off the rear rack rail.

3) Take out the conveyor.

4) Remove the left and right frames from the conveyor.

5) Remove the 5 nuts each of the conveyor rails to
release the hooks and the bearings.

6) To replace, reverse the above procedure.
Note: Be careful of the slider direction when fi tting

the conveyor on the crankshaft slider.

7) Adjust the reed switch position.

8) Make a trial run, and check for water leaks.

• Push out the wider side

• Face the reinforcing rib side down

Align the end of reed switch
to the center of hole

Slider

Frame

Remove nuts

Reed Switch

Roller

Hook

Frame

Bearing

Rack Rail

Conveyor

Roller

< Front View >

Rack Rail

Conveyor

Frame

56

F. Removal and Replacement of Crankshaft

To remove:

1) Remove the front panel.

2) Remove the conveyor.

3) Loosen the 6 hexagon socket set screws for the stopper and the coupling.

4) Lift off the crank together with the shaft.

5) Loosen the screw securing the crank to release the crank from the shaft.
Note: Do not disassemble the housing, oil seals and bearing.

To replace:

1) Fit the housing (up) on the housing, and put the sleeve bearing and the crankshaft into
the housing.

2) Fit the sleeve bearing, stopper, fl inger and coupling from the bottom of the crankshaft.
Secure the 2 hexagon socket set screws for the stopper with their ends in the
crankshaft groove. Secure the 4 hexagon socket set screws for the coupling to
connect the crankshaft and the gear motor.
Note: Apply a thread sealant to the hexagon socket set screws, and tighten them

securely.

3) Fit the housing cover, crank arm
and keys, then secure them with the
hexagon head bolt.

4) Replace the conveyor.

5) Make a trial run, and check for water
leaks.
Note:

1. When replacing the bearing and

shaft, apply plastics grease to the
mating surfaces.

2. Be careful not to damage or pinch

the oil seal lips.

Hex Head
Bolt

Key (Short)

Crank Arm

Housing Cover

Crankshaft

Key (Long)

Bracket
(Wash Tank)

Bracket

Flinger

Coupling

Gear Motor

57

Sleeve Bearing

Housing (Up)

Do not disassemble

Oil Seal

Bearing

Oil Seal

Housing

Sleeve Bearing

Stopper

Hex Socket
Set Screw

G. Removal and Replacement of Control Box

WARNING

Do not touch the live parts during a trial run or servicing operations.

NOTICE

Be careful not to damage the wiring when handling the control box.

1) Use the “ON/OFF” button on the operation panel to turn off the unit, then turn off the

dishwasher and booster tank power supplies. Lockout/Tagout to prevent the power
supplies from being turned back on inadvertently.

2) Remove the front panel.

3) Slide out the control box.

4) Remove the control box cover. For
component locations, see “II.A.3.
Control Box.”

Control Box

5) To remove the conveyor speed switch, turn the lever behind the
volume in the direction of the arrow, remove the switch body,
remove the nut behind the volume, and pull out the volume.

6) To replace, reverse the above procedure.

H. Removal and Replacement of Thermistor

NOTICE

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.

3. Do not shorten or cut the thermistor leads.

1) Use the “ON/OFF” button on the operation panel to turn off the unit, then turn off the
dishwasher and booster tank power supplies. Lockout/Tagout to prevent the power
supplies from being turned back on inadvertently.

58

2) Remove the front panel.

3) Slide out the control box.

4) Remove the plastic bag covering the thermistor connector, then disconnect the thermistor
connector. If replacing the wash tank thermistor, disconnect the leads from the wash tank
electrode. If replacing the booster tank thermistor, disconnect the closed end connectors
for the booster tank water level fl oat switch and the booster tank backup water level fl oat
switch.

5) Remove the tape or ties securing the thermistor leads, then pull out the thermistor from
the wash tank or booster tank straight towards you.

6) Clean out all old sealant from inside the thermistor hole.

7) Route the wires from the new thermistor connector through the existing black plastic
sleeve.

8) Apply the recommended sealant (
to the end of the new thermistor, then insert the thermistor quickly and securely.

9) Use tape or ties to secure the thermistor leads in their correct position.

10) Reconnect the thermistor connector and the wash tank electrode leads or the booster
tank water level fl oat switch and booster tank backup water level fl oat switch leads, then
bag and tie them.

11) Replace the control box and the front panel in their correct positions.

KE4560RTV, Part Code 60Y000-11 or 4A0683-01)

NOTICE

Be careful not to damage the wiring when handling the control box.

I. Removal and Replacement of Control Board or Operation Board

When replacing a control board or operation board, follow the precautions below.

NOTICE

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. It is especially important to
touch the metal part of the unit when handling or replacing the control board
or operation board.

3. Do not touch the electronic devices on the control board or operation board
or the back of the control board or operation board.

4. Do not change wiring and connections.

5. Always replace the whole control board or operation board assembly if it
goes bad.

6. Do not short out power supply to test for voltage.

1. Control Board

1) Use the “ON/OFF” button on the operation panel to turn off the unit, then turn off the
dishwasher and booster tank power supplies. Lockout/Tagout to prevent the power
supplies from being turned back on inadvertently.

2) Remove the front panel and the control box cover.

59

3) Disconnect the control board connectors from the control board.

4) Slide out the control board.

5) Install the new control board.

To replace, reverse the above procedure.

6)

2. Operation Board

1) Use the “ON/OFF” button on the operation panel to turn off the unit, then turn off the
dishwasher and booster tank power supplies. Lockout/Tagout to prevent the power
supplies from being turned back on inadvertently.

2) Remove the screws securing the operation box and the cable cover to the top of the
dishwasher.

3) Remove the 4 screws from the bottom of the operation box, and remove the cover.

4) Remove the screws securing the stay - OP, joint - operation (B), and operation panel
(B).

5) Disconnect the connector for the operation board cable and the cable - operation.

6) Install the new operation board.
Note: Remove the 2.0 mm dia tube (A) from the inside groove of the old board, and

attach the tube (A) to the new board.

To replace, reverse the above procedure.

7)
Note: Make sure the tubes are snug inside the joint - operation (B) and operation panel

(B).

Operation Panel (B)

Joint - Operation (B)

Tube (A)

Connector

Operation Board

Stay - OP

Cable - Operation

Tube (B)

60

J. Removal and Replacement of Heater

When replacing the wash tank heater or the booster tank heater, remove the nuts using a
7/8" crowfoot wrench.
When replacing the booster tank heater, move the clean dishtable above the booster tank
before following the procedure below.

Use the “ON/OFF” button on the operation panel to turn off the unit, then turn off the

1)

dishwasher and booster tank power supplies. Lockout/Tagout to prevent the power
supplies from being turned back on inadvertently.

2) Remove the front panel of the dishwasher (wash tank heater).

Remove the front panel of the booster tank (booster tank heater).

3) Use the overfl ow pipe to drain the wash water tank (wash tank heater).
Use the booster tank drain hose to drain the booster tank (booster tank heater).

WARNING! To avoid possible burns, allow the rinse water temperature to fall

below 104°F (40°C) before draining.

4) Remove the tank fi lters and the separator (wash tank heater).

Remove the top panel of the booster tank (booster tank heater).

5) Disconnect the heater wiring at the closed end connectors.

6) Use a 7/8" crowfoot wrench to remove the nuts from the heater.

7) Remove the band from the heater inside the tank.

8) Remove the heater.

9) To replace, reverse the above procedure.
Note:

1. When rewiring the heater, refer to the wiring diagram to prevent miswiring.

2. The tightening torque for the nuts securing the heater must be no more and no less

than 23 lbf•in.

3. To fit the band on the heater inside the tank, first slide the band from the front

straight part to the back of the heater, hook one end in the square hole, and secure
the other end with the bolt.

61

Bolt

Band

Heater

* The illustration shows

the boster tank heater

Washer

Nut

* The illustration shows

the boster tank heater

Heater

Nut

Washer

Band

Heater

Bolt

Cross-section: band fi tting

Square Hole

K. Removal and Replacement of Float Switch

When replacing the fl oat switch, move the clean dishtable above the booster tank before
following the procedure below.

Band

1) Use the “ON/OFF” button on the operation panel to turn off the unit, then turn off the

dishwasher and booster tank power supplies. Lockout/Tagout to prevent the power
supplies from being turned back on inadvertently.

2) Remove the front panel of the booster tank.

3) Use the booster tank drain hose to drain the booster tank. WARNING! To avoid

possible burns, allow the rinse water temperature to fall below 104°F (40°C)
before draining.

4) Remove the top panel of the booster tank.

5) Disconnect the heater wiring at the closed end connectors.

6) Remove the nuts from the fl oat switch.

7) To replace, reverse the above procedure.
Note:

1. Keep the fl oat switch straight in the proper direction to prevent contact with the tank

walls and other parts.

2. The tightening torque for the nuts securing the fl oat switch must be no more and no

less than 14 lbf•in.

62

L. Removal and Replacement of Thermostat

NOTICE

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.

When replacing the thermostat in the wash water tank or the booster tank, remove the
thermostat, clear any remaining sealant from the tank walls,

above recommended sealant to the new thermostat bulb, then install the new thermostat in
its correct position

.

apply a proper amount of the

63

V. Cleaning and Maintenance Instructions
A. Daily Maintenance

IMPORTANT

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.

1) Remove the three curtains at the entrance, center, and
exit of the wash compartment.

2) Open the service panel.

3) To remove the upper wash spray arm, hold it securely
with one hand, then pull the front lever towards you
with the other hand.

4) To remove the lower wash spray arm, hold both sides,
slightly lift the front off the pins, pull the arm towards
you, then lift off the back.

5) To remove the upper rinse spray arm, turn the top
away from you to unhook, then lift off the end of the
pipe.

64

6) To remove the lower rinse spray arm, push down
the rising part to unhook, pull off the end of the pipe
towards you, then take it out from between the rack
rails.

7) Remove the separators.

8) Take out scraps from the removed tank filters, drain
pipe and separators, and wash them clean with a
scouring pad.

IMPORTANT

To prevent damage, do not hit the fi lters on the sink to drop scraps or to drain
the fi lters.

9) If the wash spray arm and rinse spray arm nozzles are
clogged, use a wire or brush to unclog and wash them
clean.

Rinse
Spray Arm

10) Wash the curtains.

Wash
Spray Arm

65

11) Clean the wash compartment. Remove any scraps
from inside the wash compartment and wash tank.
Use a scouring pad to wash off heavy soils. Remove
any silverware left inside the wash compartment.

Silverware

12) Check the pump filters inside the wash tank. If they
are clogged, clean them with a scouring pad.

13) Check the water level sensor. If it is dirty, clean it with
a soft brush.

Pump Filter

IMPORTANT

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.

14) Replace the separators in their correct positions.

15) Install the left and right tank fi lters.

16) Insert the drain pipe.

66

17) To replace the upper wash spray arm, hold it with the
nozzles facing down, and insert the joint into the pipe
located at the back of the wash compartment. Lift up
the front, then securely hook in the square hole.

18) To replace the lower wash spray arm, hold both sides
with the nozzles facing up, and put it under the rack
rails from the front. Insert the joint into the pipe located
at the back of the wash compartment. Fit the holes on
the pins at the front of the wash tank.

Hook

Rack Rail

19) To replace the upper rinse spray arm, insert the end
of the pipe into the joint, then turn and hook the top.

67

Ring

20) To replace the lower rinse spray arm, put it between
the rack rails, insert the end of the pipe into the
joint, then turn and hook the front.

21) Install the curtain (L) in the wash compartment.

Ring

22) Install the curtains (S) at the entrance and exit of
the wash compartment.

Curtain Rod
(longer)

Fit front fi rst

Curtain Rod
(shorter)

68

Fit in rear notch

23) Close the service panel.

WARNING

To prevent entrance of dust or insects and injuries by a sudden drop, do not
leave the service panel open.

B. Weekly Maintenance

1. Heater

WARNING

To prevent burns, wait for 10 minutes after draining the unit to clean the interior.

Remove any scraps from the heater, and use
a soft brush to wash off residue.

Heater

Soft Brush

Do not use a metal
brush which may
damage the surface.

2. Exterior

1) Wipe the exterior with a soft cloth.

2) Use a damp cloth containing a neutral cleaner to wipe off dirt. Then wipe away the

residue with a clean cloth.

C. Monthly Inspection

1. Water Supply Line

Check the water supply line for damage, deformation, or water leak marks (stains). If any
of these conditions are found, contact an authorized Hoshizaki service company.

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, fi re, 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

69

D. 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 fi ll cycle to fi ll
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 26.4 gallons of
water.

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

4) 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.

5) Check the wash tank interior. Repeat steps 1) through 4) if necessary.

WARNING

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

6) Drain the wash tank, then start the auto fi ll cycle. Run the dishwasher to rinse the wash
tank thoroughly. Drain the wash tank.

E. Shutdown

NOTICE

If there is a possibility that the
ambient temperature may fall below
32°F (0°C) and freeze the unit, be
sure to drain the unit. The water
supply line could be damaged and
leak water, resulting in damage to
the surrounding property.

To drain out the water heater, close
the water supply line shut-off valve,
and open the drain valve and water
supply valve.

Dishwasher

Booster Tank Water Supply Valve

Water Heater

Water Supply Line
Shut-off Valve

Gas Supply Line
Shut-off Valve

Drain Valve

70

1) Press the “ON/OFF” button on the operation panel. The display and lamps go off.

2) Turn off the water heater.

3) Turn off the gas and water supplies.

IMPORTANT

To operate the water heater, follow its instruction manual.

4) Open the service panel.

Hook

IMPORTANT

Be sure to hook the service panel in its open position.

5) Pull out the drain pipe to drain water from the
wash tank.

WARNING

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.

Service Panel

6) Remove the two tank filters without spilling
scraps inside.

71

F. Long Storage, Relocation, Disposal, Transfer

When preparing the unit for long storage, shut down and clean the unit according to
sections A - E.

If something seems wrong when restarting the unit after long storage, turn off the power
supply, and immediately contact an authorized Hoshizaki service company.

WARNING

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.

2. In case of relocation, contact an authorized Hoshizaki service company.
Improper installation may cause water leak, electric shock or fi re.

3. When disposing of the unit, contact an authorized Hoshizaki service company.
Leaving the unit may violate laws or cause an unexpected accident.

NOTICE

When selling or transferring this product, tape the instruction manual and the
installation manual to the exterior to provide the new owner with information on
safe and proper use of the product.

VI. Operating Instructions

• 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. They may clog the piping and wash pump, resulting in reduction of washing
performance or pump failure.

• Install the separator and tank filters without creating a large gap at the tank overlap.
Do not bang the tank fi lters and separator to clean or drain, or they may be deformed.
Leftovers and other foreign matter may enter the tank and clog the piping and wash
pump, resulting in reduction of washing performance or pump failure.

• Insert the drain pipe (overflow pipe) after installing the separator. The separator may
rise up to create a large gap at the tank overlap. Leftovers and other foreign matter may
enter the tank and clog the piping and wash pump, resulting in reduction of washing
performance or pump failure.

• After closing time, always clean the tank fi lters, wash/rinse spray arms and water level
sensor. When disassembling the spray arms, check and remove any leftovers clogging
the pipe joints. Otherwise the leftovers may become hard to remove or spoil.

• Read the instruction manual carefully to ensure safe and proper operation.

72

VII. Technical Information
A. Water Circuit

Gear Motor

Detergent Feeder
(not provided)

Upper Wash
Spray Arm

Wash
Water

Lower Wash
Spray Arm

Upper Rinse
Spray Arm

Backup Water
Level Float Switch

Lower Rinse
Spray Arm

Rinse Aid Feeder
(not provided)

Water Level
Float Switch

Inlet Water Valve

Booster
Tank

Hot Water

Water Level Safety
Float Switch

Booster Tank Heater

Wash Tank Heater

Wash Pump
(Lower Spray Arm)

Drain

Wash Pump
(Upper Spray Arm)

Drain Pipe

Rinse Pump

Water Level Sensor

• The wash water is sprayed by the two wash pumps from the upper and lower wash spray
arms into the wash compartment.

• The rinse water is sprayed by the rinse pump from the upper and lower rinse spray arms
into the wash compartment.

• The detergent is fed by the detergent feeder (not provided by Hoshizaki) through the
detergent outlet (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.

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B. Wiring Diagram

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