Contents
Safety Instructions
Remote Controller
LCD Display Icons
Turning the Controller On or Off
Setting the water temperature
Entering High Temperature Mode (Commercial Mode)
Entering Lock Mode
Setting the clock
Setting the Recirculation timer
Canceling all timer settings
Setting the initial number of activating units for Cascade systems
Setting the temperature of DHW storage tank usage mode
Additional features for Cascade systems
About errors and icons
About scale warning
Basic Troubleshooting and Frequently Asked Questions
Error Code Guide
3
4
5
6
7
8
9
10
12
15
16
17
20
21
22
23
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Safety Instructions
The following safety symbols are used in this manual. Read and follow all safety
instructions in this manual precisely to avoid unsafe operating conditions, fire,
explosion, property damage, personal injury, or death. Keep this manual for future
reference.
Indicates an imminently
hazardous situation which, if not
avoided, could result in severe
injury or death.
Indicates a potential hazardous
situation which, if not avoided,
may result in injury or death.
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or loss of life.
Indicates a potentially
hazardous situation that, if not
avoided, could result in property
damage.
3
Remote Controller
LCD display
LED indicator
Indicates functions and
current status.
Indicates the status of water
heater.
- Green: Normal Mode.
- Red: Error occurred.
Timer button
Lock button
Access the timer settings.
Locks the other button
operations.
Up button
Power button
Increase the temperature
or value.
Turns the remote controller
on or off.
Down button
OK button
Decrease the temperature
or value.
4
LCD Display Icons
Timer is set.
Recirculation Mode.
Displays the current time.
Hot water is in use.
Displays the currently set
temperature.
Combusting is in progress.
Operations are locked.
An error code will appear on the
display.
Operating in energy saving
mode.
5
Turning the Controller On or Off
To turn the controller on or off, press the Power
button.
When the power is on,
t The LCD display turns on.
t The LED indicator turns green.
t Hot water temperature is displayed.
Note
t When an error occurs, the LED
indicator turns RED and blinks (except
for Cascade mode).
t The backlight stays on for 8 seconds on
every button pressing.
6
Setting the water temperature
Adjusting the temperature differs depending on
the DIP switch settings.
Level 1: 98~120°F (36~50°C)
t Press the Up or Down button to adjust the
temperature. The temperature changes by 1°F
(0.5°C).
Level 2: 120~140°F (50~60°C)
t Press and hold the Up button for 2 seconds to
increase the temperature by 5°F (2°C).
or
t Press the Down button
temperature by 5°F (2°C).
to
adjust
the
t To save setting, press the OK button.
Note
While using hot water, setting the water
temperature is available only up to
110°F (43°C). Water above 110°F (43°C)
can cause instant scalding or severe
burns.
t For temperatures between 140°F
(60°C) and 182°F (83°C), check the High
temperature mode in the next section.
t The settings are automatically saved
when you do not press any buttons for
5 seconds.
7
Entering High Temperature Mode (Commercial Mode)
1
2
5 sec
10 sec
Press and hold the Up and Down button
simultaneously for 10 seconds.
t When this mode is available, "HIGH" appears for
3 seconds.
t When this mode is unavailable, "LoW" appears
for 3 seconds.
Press the Up button for 5 seconds to increase the
temperature by 10°F (5°C), and press the Down
button to decrease the temperature by 10°F (5°C).
Note
Commercial Warranty Applies when this
mode is used. Refer to the Warranty in the
Operation manual for more details.
To prevent instant scalding or severe burns, check the set temperature before using hot water.
8
Entering Lock Mode
To prevent accidental pressing of the buttons or
to prevent children from operating the controller,
you can enter Lock Mode.
To activate or deactivate Lock Mode, press the
Lock button for 2 seconds.
When Lock Mode is activated,
2 sec
t The Lock icon appears.
t All buttons except for Lock button are locked.
Note
t Resetting errors or alarms is still
available with Lock Mode activated.
t You can change the settings on the
panel with Lock Mode activated.
9
Setting the clock
1
2
or
Press the Timer button.
10
Adjust the minute by pressing the Up or Down
Button.
3
4
Press the OK button to move to the Hour field.
Press the OK button to finish and save the time.
Adjust the hour by pressing the Up or Down
Button
11
Setting the Recirculation timer
1
2
X2
or
Press the Timer button twice to set the
Recirculation timer.
Set the turn on time by pressing the Up or Down
button.
Reservation 1 is ready to be set.
Press the OK button to set the turn off time.
Note
12
The setting time changes by 30 minutes
for each button pressing.
4
3
or
Set the turn off time by pressing the Up or Down
button.
Press the OK button to save the timer setting.
Repeat the same for Reservation 2 and 3.
13
5
At the reserved time, the preheating icon turns on
and the Reservation area starts flashing.
Note
14
This is applied to models with preheating
only.
Canceling all timer settings
Press and hold the Timer and OK button
simultaneously for 2 seconds.
"CLR" appears for 3 seconds and all timer settings
are canceled.
2 sec
15
Setting the initial number of activating units for Cascade systems
1
2
2 sec
or
Press the Timer and Lock button simultaneously
for 2 seconds with the Power off.
The number of initial activating water heaters is
displayed.
Note
16
The maximum number of setting unit is
16.
Press the Up or Down button to adjust the value.
Press the OK button to save changes.
Note
When you do not press the OK button for
10 seconds, the changes are not saved.
Setting the temperature of DHW storage tank usage mode
1
2
2 sec
or
Press the Timer and OK button simultaneously for
2 seconds with the Power off.
Press the Up or Down button to adjust the value
Cascade On-unit temperature is ready to be set.
Press the OK button to switch to Cascade Off UNIT
temperature settings mode.
Note
This is not applied to models with
recirculation.
by 1.
"S OU (Setting temp-gap for heating-On each
of the Unit)" and the corresponding value are
displayed.
Note
Setting value ranges from 0 to 60.
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4
3
or
or
Press the Up or Down button to adjust the value
by 1.
Press the Up or Down button to adjust the value
by 1.
Press the OK button to switch to Operation
temperature settings mode.
Press the OK button to switch to Stop temperature
settings mode.
"S FU (Setting temp-gap for heating OFF each
of the Unit" and the corresponding value are
displayed.
"S Ot" and the corresponding value are displayed
on the LCD display.
Note
18
Setting value ranges from 0 to the set
temperature for Cascade On Unit.
Note
Setting value ranges from 0 to the set
temperature for Cascade Off Unit.
5
or
Press the Up or Down button to adjust the value
by 1.
Press the OK button to finish the settings and exit
the settings.
"S Ft" and the corresponding value are displayed.
Note
t Setting value ranges from 0 to the set
temperature for Operation settings.
t The actual temperature is calculated as
the set values × 0.5.
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Additional features for Cascade systems
Stand by feature before On/Off
System info on the Slave panel
This feature allows the system to stand by until the
Power switches to On or Off.
When the remote controller is connected to the
wrong panel, its ID is displayed on the LCD display
as an alert. In this case, you cannot control or
change the settings.
"WAIT" is displayed while the entire Cascade water
heater power switching is completely finished.
Connect the remote controller to the Master panel
correctly.
Note
20
This is applied to models with Cascade
systems only.
About errors and icons
For level 1 errors
Reset errors
Current status and the error code displays in turn.
You can reset the errors and control them.
After the problems for errors are solved, press the
OK button once and "RST" is displayed on the LCD
display.
For level 2 errors
The error code and the repair icon displays in turn.
The LED flashes in red.
You cannot reset the errors or control them.
For Cascade systems
Regardless of error levels, the following is
displayed in turn: Current status, error code, and
Cascade ID.
You can reset errors and control them.
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About scale warning
Scale warning
Deactivating the scale alarm
When the water heater needs to be cleaned, the
scale alarm is activated.
Press and hold the OK button for 2 seconds.
"RST" is displayed for 3 seconds.
Current status and alarm code is displayed in turn.
You can change the settings and control them.
For Cascade systems
The following is displayed in turn:
Current status, alarm code, and Cascade ID.
You can change the settings and control them.
Note
22
For details, see the Operation manual.
Basic Troubleshooting and Frequently Asked Questions
If you experience a problem with the water heater, refer to the following chart for
possible remedies. Error codes that appear on the front panel display are explained in
the following section.
For minor problems, resetting the water heater may resolve the issue. To reset the
water heater, press the Reset button on the front panel.
If resetting the water heater and attempting the remedies suggested below do not
resolve the problem, contact an authorized technician, a licensed professional, or
Technical Support at 1-800-519-8794 for service instructions.
Problem
Possible Cause(s)
No water comes out
when the hot water tap is
opened.
t Is the cold water inlet filter clean?
It takes too long for hot
water to reach the fixtures.
Are you using the external
recirculation mode?
What to do
t Ensure that the shut–off valves on the
hot and cold pipes are open.
t Is an error code displayed on the
front panel?
t If an error code is displayed, refer to the
Error Code Guide.
t Is the water heater frozen?
Have a contractor install a recirculation
return line from the furthest faucet back to
the water heater.
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Problem
The water from the hot
water faucet is cold or
turns cold and stays cold.
Possible Cause(s)
What to do
t Is the cold water inlet filter clean?
t Clean the cold water inlet filter. See
“4.4 Cleaning the Inlet Water Filter and
t Is the hot water faucet open wide
Recirculation Inlet Filter” in the Operation
enough draw at least 0.5 gallons of
manual.
water per minute (GPM) through
the water heater?
t Open the hot water faucet completely.
t Is an error code displayed on the t If an error code is displayed, refer to the
front panel?
Error Code Guide.
t If there is an external recirculation
system installed, is there a check
valve on the recirculation return
line?
The water is not hot
enough.
Is the set temperature too low?
t Check the water heater’s temperature
setting. Refer to “3.2 Adjusting the Water
Temperature” in the Operation manual.
t Check for cross plumbing between the
cold and hot water lines.
The water is too hot.
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Is the set temperature set too high?
t Check the water heater’s temperature
setting. See “3.2 Adjusting the Water
Temperature” in the Operation manual.
Error Code Guide
Error Code
E003
Reason
Ignition failure
Self-diagnostic / Action
Ensure that the main gas supply valve is open.
E004
False flame detection
Ensure that the electrical cord is properly grounded.
E010
Abnormal air pressure
t Ensure that the exhaust pipe is free of obstructions.
E012
Flame loss
t Clean the intake air filter. See the Operation manual.
E016
Overheating of heat exchanger
t Turn off the system for at least 30 minutes, and then
restart it.
t Clean the intake air filter. See the Operation manual.
t Ensure that the electrical cord is properly grounded.
t Clean the cold water inlet filter. See the Operation
manual.
t Flush the heat exchanger. See the Operation manual.
E030
Exhaust overheating (the water
t Turn off the system for at least 30 minutes, and then
heater shuts down when the flue
restart it.
temperature exceeds 149°F (65°C) t Clean the cold water inlet filter. See the Operation
manual.
E046
Abnormal operation: limit control
t Flush the heat exchanger. See the Operation manual.
Contact Technical Support at 1-800-519-8794.
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Error Code
E047
Reason
Abnormal operation: exhaust
thermostat
Self-diagnostic / Action
Contact Technical Support at 1-800-519-8794.
E109
Abnormal operation: fan motor
Clean the intake air filter. See the Operation manual.
E407
Hot water outlet: thermostat
open or short circuit
Contact Technical Support at 1-800-519-8794.
E421
Cold water inlet1: thermostat
open or short circuit
Contact Technical Support at 1-800-519-8794.
E432
Cold water inlet2: thermostat
open or short circuit
Contact Technical Support at 1-800-519-8794.
E434
Abnormal operation: water
adjustment valve
Contact Technical Support at 1-800-519-8794.
E438
Abnormal operation: circulation
pump
t External: Ensure that all water supply and return lines are
open.
E439
Abnormal operation: flow sensor
Contact Technical Support at 1-800-519-8794.
E515
Abnormal operation: controller
Check the front panel settings.
t Internal: Check the direction of the 2-way valve.
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Error Code
Reason
Self-diagnostic / Action
E517
Abnormal operation: DIP switch
setting
Check the settings for Circuit Board DIP Switch (See the
Installation manual).
E593
Abnormal operation: front panel
key
Contact Technical Support at 1-800-519-8794.
E615
Abnormal operation: input and
memory
Contact Technical Support at 1-800-519-8794.
E736
Abnormal operation: cascade
communication
Contact Technical Support at 1-800-519-8794.
E782
Abnormal operation: main panel
communication
Contact Technical Support at 1-800-519-8794.
Note
If any of these remedies do not resolve the problem, contact Technical Support at 1-800-519-8794.
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Memo
Memo
Memo