Hoshizaki America, Inc.
Hoshizaki
Water Electrolyzer
Model
ROX-20TB2-U
SERVICE MANUAL
“A Superior Degree
of Reliability”
Number: X002-858
Issued: 3-9-2012
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IMPORTANT
This manual should be read carefully before the unit is serviced or maintenance
operations are performed. Only qualified 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.
PAGE
CONTENTS
I. GENERAL INFORMATION --------------------------------------------------------------------------5
1. SAFETY INSTRUCTIONS-------------------------------------------------------------------------5
2. PRODUCT INFORMATION -----------------------------------------------------------------------7
[a] FEATURES----------------------------------------------------------------------------------------7
[b] MODEL NAME -----------------------------------------------------------------------------------8
3. DIMENSIONS/SPECIFICATIONS ---------------------------------------------------------------9
4. PERFORMANCE DATA-------------------------------------------------------------------------- 10
II. TECHNICAL INFORMATION--------------------------------------------------------------------- 11
1. PRINCIPLE OF ELECTROLYSIS-------------------------------------------------------------- 11
2. CONSTRUCTION---------------------------------------------------------------------------------- 14
[a] GENERAL --------------------------------------------------------------------------------------- 14
[b] MECHANISM ----------------------------------------------------------------------------------- 16
[c] CONTROL BOX-------------------------------------------------------------------------------- 17
3. WIRING DIAGRAM-------------------------------------------------------------------------------- 19
4. WATER CIRCUIT ---------------------------------------------------------------------------------- 20
5. FUNCTIONS AND OPERATION--------------------------------------------------------------- 21
[a] NORMAL MODE------------------------------------------------------------------------------- 21
[b] SHORT MODE --------------------------------------------------------------------------------- 21
[c] ADJUSTMENT MODE------------------------------------------------------------------------ 21
[d] CHECK MODE --------------------------------------------------------------------------------- 22
III. SERVICE INFORMATION------------------------------------------------------------------------ 27
1. ERROR CODES ----------------------------------------------------------------------------------- 27
2. SERVICE DIAGNOSIS --------------------------------------------------------------------------- 27
3. FLOW RATE ADJUSTMENT-------------------------------------------------------------------- 29
4. REMOVAL AND REPLACEMENT OF COMPONENTS---------------------------------- 30
[a] ELECTROLYTIC CELL----------------------------------------------------------------------- 30
2
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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.
Indicates a hazardous situation which could result in death or
serious injury.
WARNING
NOTICE
IMPORTANT
Indicates a situation which could result in damage to the unit or
property.
Indicates important information about the use and care of the
unit.
In the context of this manual, the term "sanitizing water" refers to acidic water and
"cleaning water" refers to alkaline water.
WARNING
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 fire, follow
basic precautions including the following:
• Only qualified service technicians should install and service the unit.
• This unit must be installed in accordance with applicable national, state, and
local codes and regulations.
• This unit requires an independent power supply. See the nameplate for
proper voltage and breaker/fuse size. Failure to use a proper breaker or fuse
can result in a tripped breaker, blown fuses, or damage to existing wiring.
This could lead to heat generation or fire.
• THIS APPLIANCE MUST BE GROUNDED. This appliance is equipped
with a NEMA 5-15 three-prong grounding plug to reduce the risk of potential
shock hazards. It must be plugged into a properly grounded, independent
3-prong wall outlet. If the outlet is a 2-prong outlet, it is your personal
responsibility to have a qualified electrician replace it with a properly
grounded, independent 3-prong wall outlet. Do not remove the ground prong
from the power cord and do not use an adapter plug. Failure to follow these
instructions may result in death, electric shock, or fire.
• Turn off the power supply before servicing. Lockout/Tagout to prevent the
power supply from being turned back on inadvertently.
• Do not make any alterations to the unit. Alterations could result in electric
shock, injury, fire, or damage to the unit.
• This unit is not intended for outdoor use (including under canopy). Exposure
to rain may cause electric leak or shock. Direct sunlight can damage the
plastic tank exterior, resulting in cracks and water leaks.
3
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• Ensure adequate ventilation. Hydrogen gas or chlorine gas may cause
health problems.
• Do not mix electrolyzed water with other chemicals. Mixture with acidic
or chlorine-based chemicals can cause chlorine gas, resulting in health
problems.
• Do not use a large volume of sanitizing water only. Generation of a
large amount of chlorine gas may cause health problems or corrosion of
surrounding equipment.
• Do not use a flame near a container or tank holding electrolyzed water.
Hydrogen gas from cleaning water may cause ignition.
4
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I. GENERAL INFORMATION
1. SAFETY INSTRUCTIONS
The following instructions contain important safety precautions and should be strictly
observed.
WARNING
1. When there is no need to energize the unit during disassembly or cleaning,
be sure to unplug the unit or disconnect the main power supply before
servicing the unit to prevent electric shocks.
2. If the unit must be energized for inspection of the electric circuit, use rubber
gloves to avoid contact with any live parts, which may result in electric
shocks.
3. Check for proper ground connections, and repair if necessary to prevent
electric shocks.
4. Always use service parts intended for the applicable model for replacement
of defective parts. Use proper tools to secure the wiring. Otherwise
abnormal operation or trouble may occur and cause electric leaks or fire.
5. Check for proper part installations, wiring conditions and soldered or
solderless terminal connections to avoid smoke, fire or electric shocks.
6. Be sure to replace damaged or deteriorated power cords and lead wires to
prevent electric shocks, flames or smoke.
7. Lead wires using solderless terminals or the like must be bound with their
closed ends up to avoid entrance of moisture that could lead to electric leaks
or fire.
8. After servicing, always use a megohmmeter (500VDC) to check for
the insulation resistance of minimum 1 megohm between the live part
(attachment plug) and the dead metal part (ground terminal). Negligence in
checking may cause electric leaks or shocks.
9. Do not service the electrical parts with wet hands to prevent electric leaks or
shocks.
10. Always ask the user to keep children away from the work area. They may
be injured by tools or disassembled products.
5
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NOTICE
1. After servicing, be sure to check for water leaks from the water supply and
drain lines to prevent wetting the surrounding properties.
2. After servicing, always check for proper operation.
CAUTION LABEL LOCATIONS
The following caution labels are attached where special care should be taken.
On top panel
Inside door
6
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2. PRODUCT INFORMATION
[a] FEATURES
1) Space saving
The compact unit [W11" x D16" x H12" (W280 x D400 x H310 mm)] allows for
installation under sink.
2) Various optional parts available
Float switch: Detects the tank water level to automatically
start/stop operation. Includes the upper
and lower sanitizing water tank level float
switches and upper and lower cleaning
water tank level float switches.
Outlet valve: Allows use of electrolyzed water stored in
the tank, as required. Connected with the
electrolyzed water outlets [for sanitizing
and cleaning water outlets] on the water
tank. Use as needed [yellow for sanitizing
water, blue for cleaning water].
3) Concentrated salt water direct injection system
Direct addition of concentrated salt water held in the salt water tank (accessory) into
the water flow requires no tank for diluted salt water, resulting in reducing the space
required.
4) Built-in current sensor
No salt concentration sensor is required. The built-in current sensor provides highly
accurate control.
5) Constant-voltage DC power supply
Current control by a constant-voltage power supply uses the salt concentration to
correct reduction of the electrolyzation efficiency, resulting in stable concentration of
available chlorine.
6) Available chlorine concentration 20 - 30 mg/L or more
Sanitizing water contains undissociated hypochlorous acid (HOCl) which sanitizes
faster than sodium hypochlorite (NaOCl) and does not leave residue.
7) Built-in flow rate adjusting valve
The built-in flow rate adjusting valve automatically controls the flow rate according to
the selection (low, medium, high).
7
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[b] MODEL NAME
ROX - 20 T B2 - U
For USA
Development order
Table-top or under-sink installation
Maximum flow rate (x 0.1 L/min)
Hoshizaki water electrolyzer
8
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3. DIMENSIONS/SPECIFICATIONS
9
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4. PERFORMANCE DATA
The following graph shows the electrode performance curve. The electrode life cycle
depends on the free chlorine concentration as well as the raw water quality. To optimize
the electrolyzed water, we recommend the electrolytic cell should be replaced every 3,000
hours of operation.
60
50
40
30
20
10
0
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
Time <h>
10
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II. TECHNICAL INFORMATION
1. PRINCIPLE OF ELECTROLYSIS
Water (H2O) we use in our daily life has a mysterious power. Adding a small amount of salt
(NaCl) to water (H2O) and electrolyzing it with special electrodes will generate "electrolytic
oxidizing water (acidic water)" with strong oxidizing effects and "electrolytic reducing water
(alkaline water)" with strong reducing effects. Here we explain this electrolysis process and
the meaning of such terms as "pH" and "oxidization/reduction" which may sound unfamiliar.
Electrolysis Process - See the diagram on the following page for the electrolysis
mechanism inside the electrolytic cell.
1) Electrolysis with a higher salt concentration around 5 - 20% is apt to generate chlorine
gas (Cl2) at the anode. The electrolyzer with a lower salt concentration around 0.07 -
0.15% is apt to generate hypochlorous acid (HOCl) at the anode.
2) At the anode, oxidization will generate hypochlorous acid (HOCl) and chlorine gas (Cl2).
3) At the cathode, reduction will generate hydrogen gas (H2) and sodium hydroxide (NaOH).
Oxidization/Reduction - Oxidization and reduction occur a the same time, while electrons
are transferred.
1) Oxidization - Reaction of a substance to emit electrons.
2) Reduction - Reaction of a substance to receive electrons.
Oxidization/Reduction Potential - Degree of liability to oxidization and reduction,
indicated in "mV".
1) Positive potential - An oxidizing agent (= a substance capable of oxidizing other
substances) is contained. The higher potential shows the higher tendency to oxidize
other substances.
2) Negative potential - An reducing agent (= a substance capable of reducing other
substances) is contained. The lower potential shows the higher tendency to reduce
other substances.
pH - Concentration index of hydrogen ions. pH7 means neutrality, the higher pH alkalinity,
and the lower pH acidity.
11
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12 V DC
Flow of electrons
DC Power Supply
Sodium Hydroxide
(NaOH)
Hypochlorous Acid
(HOCl)
Electrolytic Cell
Na+
Positive ions drawn
to cathode
Cathode
(RED)
Anode
(OX)
Na+
OH-
Diaphragm
Na+
H2
HOCl
OH-
2e-
2e-
Na
Na
H2O
H2O
Cl-
Negative ions
drawn to anode
Cl-
Salt Water (NaCl)
Reactions at Anode
Reactions at Cathode
-
-
+
Chloride ions (Cl ) and hydroxide ions emit
Sodium ions (Na ) receive electrons (e )
from the cathode and become sodium
metal (Na) which reacts with water (H2O)
and becomes sodium hydroxide (NaOH)
and hydrogen gas (H2).
-
electrons (e ) to the anode, which become
hypochlorous acid (HOCl).
12
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-
+
Salt water contains four kinds of ions; sodium ions (Na ), chlorine ions (Cl ), hydrogen ions
-
+)
(H and hydroxide ions (OH ).
-
-
+
+
NaCl + H2O
(Mix water and salt)
→
Na + Cl + H + OH
Salt water (4 kinds of ions)
When two electrodes are inserted into salt water and voltage is applied:
-
+
Negative ions (Cl ) are drawn to the anode, and
Positive ions (Na ) are drawn to the cathode.
At the anode, hydrogen chloride (HCl) and hypochlorous acid (HOCl) are generated.
-
-
2Cl + H2O
→
HCl + HOCl + 2e
-
Electrons (2e ) are emitted to the anode, which means the acidic water (HCl + HOCl)
causes
oxidization. [As electrons are emitted, the oxidization/reduction potential becomes positive
(+mV).]
Chlorine ions also emit electrons and become chlorine gas (Cl2).
-
-
2Cl
→
Cl2 + 2e
(Cl2 = chlorine gas)
At the cathode, sodium hydroxide (NaOH) and hydrogen gas (H2) are generated.
-
+
+
Na + H2O + H + 2e
→
NaOH + H2
-
Electrons (2e ) are received from the cathode, which means the alkali water (NaOH)
causes reduction. [As electrons are received, the oxidization/reduction potential becomes
negative (-mV).]
13
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2. CONSTRUCTION
[a] GENERAL
(1) Operation Panel [Body]
Displays the present state of the electrolyzer.
(2) Door
Provided behind are the power switch (ground fault interrupter) and the buttons to
adjust the operating conditions and various set values.
14
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(3) Coin Lock
Locks the door.
(4) Cleaning Water Outlet
Dispenses cleaning water (sanitizing water in flushing process). Should be
connected with the cleaning water outlet [remote].
(5) Sanitizing Water Outlet
Dispenses sanitizing water (cleaning water in flushing process). Should be
connected with the sanitizing water outlet [remote].
(6) Water Supply Inlet
Should be connected with the water supply hose (G3/4) provided.
(7) Panel
Only a responsible maintainer or service personnel may open.
(8) Rear Panel
Only a responsible maintainer or service personnel may open for connection of the
remote controller cable.
(9) Panel (L)
Only a responsible maintainer or service personnel may open.
(10) Panel (R)
Only a responsible maintainer or service personnel may open for connection of the
remote controller cable.
(11) Leg
Do not remove. Not adjustable. Use spacers, if required, for stable installation.
(12) Drain Outlet
Can be connected with a drain pipe (G1/2), if the internal water circuit should be
drained.
(13) Power Cord
Single phase 115V. Be careful not to jerk or pinch.
(14) Salt Water Filter
Removes foreign matter from concentrated salt water in the salt water tank. Do not
clog. Clean at least once a month.
(15) Salt Water Hose
Supplies concentrated salt water from the salt water tank. Do not curve or bend by
force.
(16) Remote Controller Receptacle
Connects the remote controller cable with the electrolyzer body. Remove the
grommet, and attach the super lock of the remote controller.
(17) Operation Panel [Remote]
For the remote controller. Attachable at a point of use.
(18) Cleaning Water Outlet [Remote]
Should be connected with the cleaning water outlet to dispense cleaning water
(sanitizing water in flushing process).
(19) Sanitizing Water Outlet [Remote]
Should be connected with the sanitizing water outlet to dispense sanitizing water
(cleaning water in flushing process).
(20) Controller Bracket
Fixes the remote controller. Secure on a wall with anchor bolts.
15
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(21) Cable
Electrically connects the remote controller and the electrolyzer body. Be sure to
make the connection when using the remote controller.
(22) Salt Water Tank
Makes 1.32 gal (5 L) of electrolyte (concentrated salt water) and adds it to water
(diluted salt water).
(23) Motion Sensor
Non-contact sensor to start and stop dispensing electrolyzed water.
[b] MECHANISM
33
24
29 30
27
28
26
25
31
32
34
(24) Control Box
Functions as the brain of the electrolyzer to control its operation
(25) Dispense Button [Body]
Starts and stops dispensing sanitizing water and cleaning water.
(26) Water Valve
Supplies water from the water supply hose to the electrolytic cell.
(27) Flow Switching Valve
Operates every 12 hours to change the flow direction when the DC voltage to the
electrolytic cell reverses.
(28) Gear Motor
Rotates the impeller inside the flow switching valve.
16
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(29) Microswitch [Location]
Senses the location of the flow switching valve.
(30) Microswitch [Direction]
Senses the direction of the flow switching valve.
(31) Flow Control Valve
Located between the water supply inlet and the electrolytic cell. Adjusts the rate of
water supply.
(32) Electrolytic Cell
Electrolyzes diluted salt water to generate sanitizing water and cleaning water.
(33) Salt Water Pump (Electromagnetic Pump)
Feeds a fixed amount of concentrated salt water (electrolyte) into the electrolytic
cell.
(34) Thermistor
Senses the water temperature and automatically reduces the electrolytic current to
prevent excessive available chlorine concentration in low temperature conditions.
[c] CONTROL BOX
35
37
40
42
41
43
46
47
36
44
45
39
38
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(35) Relay (X1)
Located on the supply line of the switching regulator [electrolytic cell]. Turns on/off
the switching regulator by using a make contact.
(36) CB Relay
Changes the polarity of the voltage on the electrolytic cell.
(37) Current Sensor
Measures the current of the electrolytic cell.
(38) Noise Absorber
Noise absorbing board provided with a surge absorber.
(39) Switching Regulator [Main Control Board]
DC power supply to drive the DC electrical components.
(40) Main Control Board
Functions as the brain of the controls to verify inputs and command outputs.
(41) Switching Regulator [Electrolytic Cell]
DC power supply for electrolysis in the electrolytic cell.
(42) Power Switch (Ground Fault Interrupter)
Shuts off the primary power supply in case of ground leakage or overcurrent.
(43) Display
Displays the cell run time (h) normally and the present conditions of the electrolyzer
by switch operation.
(44) Display Select Button
In the normal mode, selects the display indication between the cell run time, current,
and voltage.
(45) Flush Button
In the normal mode, operates the flow changing valve to flush the water circuit.
(46) Set/Reset Button
Adjusts various set values.
(47) Flow Rate Select Button
Adjusts the flow rate.
18
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3. WIRING DIAGRAM
19
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4. WATER CIRCUIT
Flow Switching
Valve
Thermistor
20
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5. FUNCTIONS AND OPERATION
[a] NORMAL MODE
The following menus are available in the normal mode. The display shows from 1 to 3
every time the display select button is pressed.
No.
Menu
Description
Total electrolytic cell run time at present.
Current flowing in electrolytic cell at present as measured by
current sensor.
1 Cell run time (h)
2 Current (A)
Voltage provided on electrolytic cell at present as measured
by main control board.
3 Voltage (V)
[b] SHORT MODE
Use this mode to change the polarity every 2 minutes.
1) While the power switch (ground fault interrupter) is off, hold down the flush button and
set/reset button.
2) Turn on the power switch (ground fault interrupter).
3) After 5 seconds, release the flush button and set/reset button.
Note: The operation lamp flashes while the short mode is selected.
[c] ADJUSTMENT MODE
The following menus are available in the adjustment mode.
No.
Menu
Factory default
Adjustable range/increments
5.0 to 18.0/0.1
[wt=77°F(25°C)]
A1 Current (A)
A2 Voltage (V)
A3 Total flow rate (L/min)
A4 Combination
Lo: 10, Std: 10, Hi: 10
Lo: 12, Std: 12, Hi: 12 7.0 to 18.0/0.1
Lo: 3.0, Std: 4.0, Hi: 6.0 1.5 to 8.0/0.1
1
1
Main: 1, Sub: 2
1 to 60/1
A5 Portion control time (min)
Cleaning water dispensing
time for hand washing (s)
Sanitizing water dispensing
time for hand washing (s)
A6
30
30
15 to 120/5
15 to 120/5
A7
Display present run time, then
hold down set/reset button
(10s) to reset
Cell run time/reversal time
reset
A8
N/A
Std
A9 Initial flash time (s)
Std, 0 to 20/1
21
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No.
Menu
Factory default
3000
12
Cont
2
Adjustable range/increments
1500 to 9000/100
0.033 (check), 1 to 150/1
A10 Cell replacement time (h)
A11 Cell reversal time (h)
Continuous dispensing
protection time (min)
A12
Cont, 10 to 720/10
Single: 1, Std: 2
0 to 8/1
A13 Single nozzle
Water temperature correction
A14
4
factor
Flow rate adjustment factor,
operation time factor
A16 Skip
A15
0.3
N/A
0
0.1 to 2.0/0.1
Skip
Flow rate correction value (L/
A17
min)
-0.5 to 0.5/0.1
Water softener regeneration
output cycle (h)
A18
0
0 to 100/1
Salt water supply factor,
feedback
Salt water supply factor, initial
non-electrolysis time (s)
A19
1.0
5
1.0 to 5.0/0.1
1 to 10/1
A22
Salt water supply factor,
feedback cycle
A23
1.0
1.0 to 5.0/0.1
Salt water supply factor,
A25 stroke subtraction after
reaching set point (times/s)
N/A
Skip
Display "rSEt", then hold down
set/reset button (10s) to reset
A26 Reset
N/A
N/A
Flow control valve open/
A27
Display current status
closed
* Basically do NOT adjust the menus in gray.
[d] CHECK MODE
The following menus are available in the check mode.
No.
C1
C2
C3
C4
C5
C6
C7
C8
C9
Menu
Inputs
Inputs
Outputs
Salt water pump stroke (spm: strokes per minute)
Total flow rate (L/min)
Water temperature (°C)
Set current at present water temperature (A)
Corrected current (A)
Elapsed cell reversal time (min)
22
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No.
C10 Elapsed time after regeneration output (h)
C11 Last error number
Menu
C12 Cell run time at last error
C13 Cell reversal time at last error
C14 Current at last error
C15 Voltage at last error
C16 Total flow rate at last error
C17 Salt water pump stroke at last error (spm: strokes per minute)
C18 Water temperature at last error (°C)
C19 Set current at water temperature at last error (A)
C20 Corrected current at last error (A)
C21 Second from last error number
C22 Cell run time at second from last error
C23 Cell reversal time at second from last error
C24 Current at second from last error
C25 Voltage at second from last error
C26 Total flow rate at second from last error
C27 Salt water pump stroke at second from last error (spm: strokes per minute)
C28 Water temperature at second from last error (°C)
C29 Set current at water temperature at second from last error (A)
C30 Corrected current at second from last error (A)
C31 Third from last error number
C32 Cell run time at third from last error
C33 Cell reversal time at third from last error
C34 Current at third from last error
C35 Voltage at third from last error
C36 Total flow rate at third from last error
C37 Salt water pump stroke at third from last error (spm: strokes per minute)
C38 Water temperature at third from last error (°C)
C39 Set current at water temperature at third from last error (A)
C40 Corrected current at third from last error (A)
C41 Model configuration (8: ROX-20TB2-U, 10: ROX-20TB2-U with tank)
C42 Control board version
* Fahrenheit and celusius conversion formulae:
°C = (°F - 32) x 5/9
°F = (9/5) x °C + 32
23
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Flow sw
valve
direction OFF: open
micro SW
Float SW
right tank
upper
ON: closed
ON: closed
OFF: open
Float SW
ON: closed
left tank
Float SW
left tank
upper
ON: closed
OFF: open
OFF: open
lower
ON: salt water
Level tank full
sensor OFF: salt water
tank not full
Spare ON: closed
SW 1 OFF: open
ON: closed
TP1
ON: closed
TP2
OFF: open
OFF: open
ON:
0° (close)
detected
hall
ON:
315° (open)
detected
hall
OFF: not
element A
detected
OFF: not
element B
detected
24
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Body
flow rate select
SW (SW64)
Body
set/reset SW
(SW63)
ON: on
OFF: off
ON: on
OFF: off
Body
display select
SW (SW61)
ON: on
OFF: off
Ext. right ON: detected
beam
OFF: not
sensor input detected
Hand or ON: closed
pool OFF: open
Remote
ON: on
Remote
ON: on
R button
OFF: off
(SW50)
M button
OFF: off
(SW51)
25
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X2
ON: excited
X3
ON: excited
sw valve OFF: not
ON during OFF: not
electrolysis excited
relay
excited
X6
ON: excited
X5
WV
ON: excited
OFF: not
add salt OFF: not
output excited
relay excited
X10
regeneration
output signal
(12V)
ON: excited
OFF: not
excited
ON: excited
OFF: not
excited
X11
unused
X14
polarity sw
relay (20TB)
ON: excited
OFF: not
excited
ON: positive
OFF: negative
X13
unused
Flow
control
valve 1
Flow
control
valve 2
Combination
of 2 valves
Combination
of 2 valves
26
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III. SERVICE INFORMATION
1. ERROR CODES
Control panel
display
Lamp No.
Error
Problem
Operation
Flow rate stayed below 0.13
Production stops after
Error E11 Low water
gal/min (0.5 L/min) for 10 sec water valve turns off Error no.
with water valve on
two times
Flow rate stayed above 0.13
Production stops after
Error E14 Water shutoff
Error E53 Contactor supply
gal/min (0.5 L/min) for 10 sec water valve turns on Error no.
with water valve off
two times
Production stops after
contactor switches
three times
Current stayed below 0.5A for 2
sec
Error no.
Error no.
Flow switching
Error E61
Switching did not complete
within 30 sec
Production stops
valve
Production continues
Open circuit -22°F (-30°C)] or as 41°F (5°C) (open
Alternate between
normal display
and error no.
[
—
—
E74 Thermistor
Float switch (if
E82 provided with
tank)
short circuit [140°F (60°C)]
circuit) or 86°F (30°C)
(short circuit)
Alternate between
normal display
and error no.
Upper switch on, lower switch Production continues
off
(for at least 3 min)
Salt water pump stayed at 700
spm (strokes per minute) for 90 Production stops
sec
Add salt
water
—
Salt water level
(Add salt lamp on)
Model setting connector lost or
Production stops
wrong
—
EE1 Model setting
Error no.
Error no.
Error EF0 Control board
EEPROM error
Production stops
2. SERVICE DIAGNOSIS
Lamp Error code
Problem
Check
Possible cause
Remedy
Add salt in salt
water tank
Add salt
water
—
Salt water pump stayed Salt water tank Low salt water
700 spm (strokes per
minute) for 90 sec
concentration
Salt water hose Loose connection to
salt water tank
Reconnect
Clogged
Unclog
Vapor lock
Prime
Filter
Dirty
Clean
Switching
regulator
(electrolytic cell)
Defective
DC supply line open
circuit
Repair or replace
Correct
Magnetic switch Defective
Bad contacts
Defective
Bad contacts
Repair or replace
Repair
Repair or replace
Repair
Relay
Current sensor Defective
Repair or replace
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Lamp Error code
Problem
(Continued)
Check
Salt water pump Defective
Improper stroke dial
setting
Possible cause
Remedy
Add salt
water
—
Repair or replace
Set to "E" (far to
left)
Supply line open circuit Correct
Signal line open circuit Correct
Error
E11
Flow control valve (flow Water supply line Water failure
rate sensor) detected
Recover water
supply
flow rate below 0.13 gal/
min (0.5 L/min) for 10
sec with water valve on
Electrolyzed
water outlet
Joint hose
Blocked
Unblock
Crushed or bent
Scaled
Correct
Replace
Filter
Clogged
Unclog
Water valve
Defective
Clogged
Repair or replace
Unclog
Supply line open circuit Correct
Flow rate sensor Defective
Clogged
Repair or replace
Unclog
Signal line open circuit Correct
Error
Error
E14
E53
Flow rate sensor
detected flow rate above
0.13 gal/min (0.5 L/min)
for 10 sec with water
valve off
Electrolytic current
stayed below 0.5A for 2
sec
Water valve
Defective
Clogged
Repair or replace
Unclog
Repair or replace
Flow rate sensor Defective
Current sensor Defective
Repair or replace
Correct
12V DC line open
circuit
Signal line open circuit Correct
Switching
regulator
Main control
board
Defective
Repair or replace
Defective
Loose chip insertion
Defective
Repair or replace
Correct
Repair or replace
Lubricate motor
shaft
Error
E61
Flow switching did not
complete within 30 sec
Gear motor
Overrun
Location
microswitch
Direction
microswitch
Defective
Defective
Defective
Repair or replace
Repair or replace
Repair or replace
—
—
E74
E82
Thermistor open circuit Thermistor
[-22°F (-30°C)] or short
circuit [140°F (60°C)]
was detected
Upper float switch turned Float switch
on and lower float switch
turned off
Defective
Repair or replace
—
—
EE1
EF0
Model setting connector Main control
Incorrect wiring
connector
Defective
Correct
lost or wrong
board
EEPROM memory
element error
Main control
board
Replace
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3. FLOW RATE ADJUSTMENT
Pressing flow rate select
button will not change flow
rate and display
Flow rate remains
unchanged or below
"HI" setting
Water supply pressure not less
than 0.15 MPa (21.76 psi)
No
Stop dispensing and press
flow rate select button
Dispensing action is
stopped
Yes
No
Yes
Select normal (Nor.) mode
and press flow rate select
button
No
No
Normal (Nor.) mode is
selected
Low water
supply pressure
Yes
Pressure ensured even
with a large amount of tap
water used elsewhere
Flow control valve connector
is disconnected
Reconnect
Yes
No
Yes
Valves and pipes free from
foreign matter or clogging
Low water
supply pressure
1. Flow control valve defective
2. Open circuit
Yes
No
Remove foreign matter,
unclog or replace
Note: The actual flow rate may differ from the setting depending on variation of the flow
rate sensor in the flow control valve.
e.g. Total flow rate setting [standard 1.06 gal/min (4.0 L/min)] --> actual flow rate [1.19
gal/min (4.5 L/min)]
If the difference is too large, use the adjustment mode (AdJ.) to adjust the total flow
rate (A3).
e.g. Total flow rate setting [0.92 gal/min (3.5 L/min)] --> actual flow rate [1.06 gal/min
(4.0 L/min)]
29
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4. REMOVAL AND REPLACEMENT OF COMPONENTS
[a] ELECTROLYTIC CELL
WARNING
To prevent electric shock, be careful not to crush or drag the pipes or wires
when removing the electrolytic cell.
NOTICE
To prevent water leaks resulting in wetting the surrounding properties, be sure to
drain water before removing the electrolytic cell.
1) Remove the front panel, turn off the power switch (ground fault interrupter), and unplug
the unit.
2) Close the water supply line shut-off valve, and disconnect the water supply, cleaning
water, and sanitizing water hoses.
3) Unscrew and remove the top and side panels.
4) Remove the drain cap on the back of the unit to drain the electrolytic cell.
5) Disconnect the power cord (red/black) on the electrolytic cell from the terminal block.
6) Remove the four union nuts from the electrolytic cell.
7) Unscrew the cell stopper and frame assembly, and remove the cell stopper from the unit
base.
8) Slide out the electrolytic cell towards you.
9) To replace, reverse the above pocedure.
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