onsen ON-I14L-LP User manual

14L
INSTALLATION AND
OPERATION MANUAL
MANUEL D’INSTALLATION
ET D’UTILISATION
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800.996.5559800.996.5559
MODEL / MODÈLE : ONI14LLP, ONI14LNGMODEL / MODÈLE : ONI14LLP, ONI14LNG
INDOOR GAS TANKLESS WATER HEATERINDOOR GAS TANKLESS WATER HEATER
CHAUFFEEAU RÉSIDENTIEL AU GAZCHAUFFEEAU RÉSIDENTIEL AU GAZ
SANS RÉSERVOIRSANS RÉSERVOIR

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WARNING
If the information in these instructions is not followed exactly, a re or explosion may result causing property damage, personal injury
or death.
Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone.
• Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the re department.
Installation and service must be performed by a qualied installer, service agency or the gas supplier.
ONSENONSEN
2181 RUE DE LA MÉTROPOLE2181 RUE DE LA MÉTROPOLE
LONGUEUIL QUÉBEC J4G 1S5LONGUEUIL QUÉBEC J4G 1S5
CANADACANADA

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TABLE OF CONTENTS
INTRODUCTION AND SAFETY WARNINGS
Important Safety Instructions ............................................................................................4
Safety Precautions...............................................................................................................5
OPERATION
How It Works ........................................................................................................................7
Operating Instructions ........................................................................................................7
Extended Shutdowns ....................................................................................................... 10
Cold Weather Warnings ................................................................................................... 12
Maintenance and Inspection .......................................................................................... 13
Troubleshooting ............................................................................................................... 16
Diagnostic Codes .............................................................................................................. 18
INSTALLATION
Installation Guidelines...................................................................................................... 19
What’s Included in the Box .............................................................................................. 20
Location and Clearance Requirements.......................................................................... 21
Mounting............................................................................................................................ 21
Electrical............................................................................................................................. 22
Gas Piping .......................................................................................................................... 22
Water Piping ...................................................................................................................... 23
Air Intake and Exhaust (Vent) System ............................................................................ 24
Start Up and Testing......................................................................................................... 29
REFERENCE
Wiring Diagram ................................................................................................................. 32
System Specications....................................................................................................... 33
Dimensions........................................................................................................................ 34
Names of Major Parts and Components ....................................................................... 34
Limited Warranty .............................................................................................................. 35
IMPORTANT: KEEP THIS MANUAL FOR FUTURE REFERENCE!

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Thank you for purchasing the
ONSEN 14L INDOOR GAS TANKLESS WATER HEATER
In order to ensure proper installation, safe operation, and long life, please read the following instructions care-
fully. Installation of this gas water heater should only be completed by a licensed professional. This will ensure
that the installation is in full compliance with all required building, plumbing and electrical codes.
KEEP THIS MANUAL for future reference. This manual includes useful information about the product, mainte-
nance requirements and the details of the product warranty.
Indicates an imminently hazardous situation which, if not avoided, will result in
death or serious injury.
Indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.
Indicates a potentially hazardous situation which, if not avoided, could result in mi-
nor or moderate injury. It may also be used to alert against unsafe practices.
THIS SYMBOL IS THE SAFETY ALERT SYMBOL WHICH IS USED TO ALERT YOU TO POTENTIAL
HAZARDS THAT CAN KILL OR HURT YOU AND/OR OTHERS
DANGER
WARNING
CAUTION
READ AND FOLLOW ALL INSTRUCTIONS
When using this gas water heater, basic precautions should always be followed.
SAFETY DEFINITIONS
INTRODUCTION AND SAFETY WARNINGS
IMPORTANT SAFETY INSTRUCTIONS

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If the water heater needs to be installed, moved, or serviced only utilize licensed professionals. The use of
professionals ensures all work is in full compliance with required building, plumbing and electrical codes.
Keep the area around the appliance clear and free of ammable materials such as cloth, wood, aerosol
cans, paper, gasoline, etc.
When using hot water for a shower or bath, always check the water temperature before entry to avoid being
scalded. Obey local codes for the maximum water temperature setting allowed. Water temperatures over
125° F (52° C) can cause severe burns or death from scalds. Households with small children, disabled or
elderly persons may require a setting of 120° F (49° C) or lower.
This heater is designed only for the heating of water and should not be used for other applications or used
to heat any other media.
Never use a fuel gas that is not listed on the nameplate as compatible with the water heater. Abnormal
combustion or a deagration may occur which can cause a serious accident including damage to the heater.
Do not use this appliance if any part has been under water. Consult a qualied service technician to inspect
the appliance and make any required repairs prior to installation and operation.
This water heater is designed for indoor mounting. Never mount it outdoors.
This equipment should be installed in an area where water leakage from the unit or connections will not
result in damage. The manufacturer is not responsible for any damages resulting from leaks.
Only connect gas and water as instructed. Incorrect or reversed connections will cause equipment damage.
Do not over tighten connections or equipment may be damaged.
Do not install in areas that are subject to vibration.
SAFETY PRECAUTIONS
DO NOT use a fuel gas that is not listed on the nameplate as compatible with the wa-
ter heater. Abnormal combustion or a deagration may occur which can cause a serious
accident.
DO NOT use the unit if the vent piping has been damaged or altered in any way includ-
ing cracking, separation, rusting, melting, etc. Improper venting may cause a buildup of
Carbon Monoxide (CO) which can cause brain damage or death.
DANGER
WARNING

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This equipment shall not be operated without the vent pipe properly connected. The exhaust pipe must
not terminate in an area where the exhausting vapor or collecting condensate could create a hazardous
situation or cause property damage. Exhaust gases must be vented out of the building in compliance with
all building codes.
The exhaust piping is very hot during and for a period after use. Do not touch the pipe.
Ensure that snow, ice or other debris does not block the inlet or exhaust pipes.
Regular housekeeping should be done in areas around the heater to prevent insect intrusion and possible
equipment malfunction.
The unit should be serviced on a routine basis to ensure optimum performance. Service needs will vary
based on local water conditions including acidity, alkalinity, hardness, etc.
Freezing temperatures will cause damage to the heater. Install in locations where freezing temperatures are
not reached and follow procedures to drain the unit if it will be out of service for a period of time.
A 120 V / 60 Hz power source should be used. Fire, electrical shock or damage to the water heater may occur
if an incorrect power supply is used.
This appliance is equipped with a three-prong grounded plug for increased protection against electrical
shock. Ensure the plug is properly inserted into a clean, dry outlet that complies with all electrical codes.
Only insert and remove the plug using the plug head and never use a wet hand to plug or unplug the power
plug.
Any alterations to the appliance will void the warranty.
Should overheating occur or the gas supply fails to shut o, turn o the manual gas control valve to the
appliance.
Do not use this appliance if any part has been under water. Immediately call a qualied service technician
to inspect the appliance and to replace any part of the control system and any gas control which has been
under water.
Caution: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper
and dangerous operation.
Verify proper operation after servicing.

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The Onsen 14L Indoor Gas Tankless Water Heater uses gas to heat water by burning a ame on the copper
heat exchanger. The incoming water is heated when it circulates through the heat exchanger before being
directed to the water outlet. The temperature of the exiting water can be increased or decreased via the
control panel of the water heater.
The temperature of the outgoing water can be adjusted between 95° F and 140° F (35° C and 60° C).
This gas water heater requires water pressure of 15 PSI and a ow rate of 0.67 gpm (2.5 l/min) to operate. The
unit will stay in operation until the ow drops below 0.53 gpm (2 l/min).
The burner ignition is electronic. The unit has no pilot light and consumes no gas when the heater is not being
used.
Air is brought into the unit from outside, eciently burned with the appropriate source of fuel, and then
exhausted externally.
The unit’s integrated control system constantly monitors the temperature of the water being produced and
adjusts the burner accordingly to deliver a stable supply of hot water.
The unit is highly exible and provides hot water over a wide range of ow rates and incoming water
temperatures across the capacity range of the unit.
The unit has multiple protective functions such as no-load heating prevention, automatic shutdown in case of
accidental ameout, and automatic pressure relief to ensure safety and reliability.
OPERATION
HOW IT WORKS
This section of the manual contains instructions regarding routine operating procedures for a heater that has
been installed, tested, and approved for operation by a licensed professional.
For a new installation, please refer to “Initial Start Up” in section “Start Up and Testing” of this manual.
OPERATING INSTRUCTIONS
NORMAL OPERATION

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Ensure all drain plugs are installed in unit.
Ensure all hot water use points (faucets, etc.)
are shut o.
Open the water inlet valve.
Open a hot water faucet to conrm water
ow and then shut o the faucet.
Open the fuel gas valve.
Plug in the unit.
Press the “ON/OFF” key to turn on the unit.
Set temperature (see “Temperature Control”
in section “Operating Instructions” of this
manual).
The control panel and display are used to adjust the operational settings of the unit as well as give information
about the current state of operation. The following illustration shows all possible symbols and signs that may
appear in various states of operation. While in operation, only the symbol or sign corresponding to the actual
state will appear on the control panel display. The water heater is in an operating state when the hot water
temperature is shown.
ROUTINE START UP
CONTROL PANEL
Temperature setting High mode
Low mode
Comfort mode
Water ow indicator
Fan motor indicator
Decrease
Eco mode
Flame indicator
Eco mode
IncreaseOn/OMode
Selection
Control Panel Diagram
1
2
3
4
5
7
6
8
Water inlet valve
Fuel gas valve

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LED Display
The LED display shows the following:
Set temperature and actual output temperature.
Flame, Fan Motor, Water Flow indicators lighting to indicate unit is operating normally.
ECO and other working mode icons when selected.
Buttons
CONTROL PANEL INDICATIONS
On/O Enables or disables the water heater.
Increase* Increases output temperature by 1 degree increment.
Decrease* Decreases output temperature by 1 degree increment.
*To switch between Fahrenheit and Celsius, press and hold the “Increase” and “Decrease” keys at the same time for
three seconds.
Eco Turns on “Eco” mode, which limits the water heater’s maximum power output at 75%.
Mode Selection Selects between the following modes:
High mode: output temperature set at 129° F (54° C)
Comfort mode: output temperature set at 108° F (42° C)
Low mode: output temperature set at 100° F (38° C)
Setting the Desired Temperature
The temperature adjustment range is 95° F – 140° F (35° C to 60° C).
Press the “ON/OFF” button. The temperature display unit lights up and displays the current temperature set
point. The factory default set point is 107° F (42° C).
Press the “Increase” or “Decrease” button to set the desired temperature. The temperature set point goes
up or down by one degree with each press.
Press the “Mode Selection” button to choose between the pre-set temperature settings described above.
After the temperature is set, open the water valve and observe. The ame, fan motor and water ow
indicators should light indicating the unit is operating normally.
TEMPERATURE CONTROL
1
2
3
4
5

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SCALD PREVENTION
If a heater will be out of service for an extended amount of time, use the following procedures to protect the
unit:
Cold air may enter the unit through the air intake or the exhaust system. Take precautions for extended
shutdowns even if unit is installed indoors in an area that does not allow direct exposure to freezing
temperatures.
Temperatures at or below 32° F (0° C) can cause permanent damage to the unit and/or the piping system due
to freezing.
After an extended shutdown (weeks/months), all settings return to their factory default values. During short
term shutdowns (power outage or if the unit is unplugged), the unit will retain the last settings selected prior
to the outage when power is restored.
EXTENDED SHUTDOWN
EXTENDED OUTAGE PROCEDURE
DANGER
Water temperatures over 125° F will scald and can instantly cause
severe burns or death!
Children, disabled and elderly are at highest risk of being scalded.
Always test the water temperature by feeling the water prior to
entering a shower, bath, etc.
Obey all codes regarding temperature set point.
Contact a licensed plumber or local plumbing authority for
clarication or additional information.
The heater and water within the unit may be very hot. Allow time for the system to
cool and use caution when draining to minimize risk of injury.
CAUTION

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A
B
C
Shut down the water heater by pressing the
“ON/OFF” button.
Close the fuel gas valve (A).
Unplug the power cord (C). Use dry hands.
Exercise caution and only unplug by grasping
the plug head and pulling. Note that all factory
settings will be restored next time unit is re-
powered.
Close the water inlet valve (B).
Open all hot water faucets.
Obtain an appropriate container to
collect the residual water from the system.
Prevent water from being discharged on the oor to avoid damage.
Prevent water contact with any electrical source in the vicinity.
WARNING
1
2
3
4
5
6
7
NOTE: Freezing temperatures below 32° F (0° C) can cause permanent damage to the heater and/or the
piping system.
Open the drain plugs and completely drain the water heater. It is recommended to blow compressed air
into the water inlet to drain any excess water remaining in the heat exchanger piping. All residual water will
drain via the water outlet.
FREEZING DAMAGE IS NOT COVERED BY THE MANUFACTURER WARRANTY.
Reinstall the drain plugs and close the hot water faucets.
To return the unit to operation, please refer to “Routine Start Up” in section “Operating Instructions” of
this manual.
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Water outlet Water inlet
Gas inlet
Drain plugs
Drain Plug Location
Freezing temperatures can damage the water heater and/or water piping. Freezing water expands rapidly and
can create tremendous mechanical forces. Mechanical damage and pipe ruptures can result from only brief
exposure to freezing temperatures.
For best results, completely shut down the system by following the “Extended Outage Procedure” in section
“Extended Shutdown” of this manual.
In cold regions, insulating material or heat tracing can be used to protect pipes and ttings.
Keep water owing through the system to guard against freezing.
Follow these steps:
Close the fuel gas valve.
Turn o the power by pressing the “ON/OFF” button.
Open a hot water faucet at one or more points of use (sink, upstairs bathtub, etc.).
Maintain a constant trickle. Monitor the stream of water to ensure it is still owing.
COLD WEATHER WARNINGS
FREEZING DAMAGE POTENTIAL AND PRECAUTIONS
COLD WEATHER WITH POTENTIAL FREEZING TEMPERATURES
1
2
3
4

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Follow these steps if a frozen heater is suspected:
Close both the fuel gas valve and the water inlet valve.
Turn o the power switch.
Open a hot water faucet.
Open the water inlet valve and check for water ow.
If no ow, attempt to thaw heater by using a portable heat source such as a hair dryer or portable electric
heater.
Check occasionally to see if water ow has started.
When water ow resumes, carefully check for any signs of water leakage.
Resume normal operation.
Damage caused by freezing is NOT covered by the warranty.
NO FLOW DUE TO EXPECTED FROZEN HEATER
WARRANTY
1
2
3
4
5
6
7
8
To keep your water heater operating optimally please refer to the below recommended inspection and
maintenance checklists. Onsen recommends a periodic inspection performed by a qualied service technician.
An annual inspection is normally sucient. Frequent visual inspections by the owner are recommended. Any
repairs should be performed by a qualied service technician using only factory authorized components.
MAINTENANCE AND INSPECTION
ROUTINE INSPECTION
To prevent damage, NEVER force a heater to operate while in a frozen state.
NEVER bypass any safety feature.
WARNING
The heater and exhaust piping will be hot during and shortly after use.
Use caution when working in the area around the heater.
CAUTION

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Any ammable materials in the vicinity of the water heater or exhaust piping?
Any unusual noises coming from the heater while in operation?
Are the air intake and exhaust free from any blockage or foreign objects?
Any signs of water leaking near heater or pipes?
Any abnormal appearance to unit casing?
ROUTINE INSPECTION CHECKLIST
Clean outside of unit and control panel:
Use a wet cloth to remove any surface dirt. Use a dry cloth to wipe it dry.
A very mild detergent may be used if unit is very dirty.
Never use any petroleum based cleaners or solvents as these can damage the panel.
Check and clear air intake of any debris that might impede air ow.
Clean inlet water screen.
Examine venting system.
Clean inside of unit by vacuuming or blowing out dust that collects in the unit. Do not open the burner.
PLEASE NOTE THAT THIS CLEANING SHOULD ONLY BE DONE BY AUTHORIZED SERVICE PERSONNEL.
Visual ame inspection.
Lime scale cleaning (if required).
MAINTENANCE CHECKLIST
MAINTENANCE PROCEDURES
Burner Inspection and Cleaning
The burner should ame evenly over the entire surface of the burner head when operating correctly.
The ame should burn with a clear, blue, stable ame.
Presence of a yellow ame or of black deposits on the burner head indicates cleaning and/or burner
replacement should occur.
1
2
3
Fan Maintenance
The fan motor is permanently lubricated and does not require periodic lubrication.
If the motor fails, it must be replaced by a qualied technician only.
1
2

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Gas
supply
Hot water line
Inline
pump
In-line
lter
V1 V2
V4
V3
H 1 H 3
H 2
1
2
3
4
5
6
7
8
Close shuto valves V3 and V4 on both the hot
water and cold water lines.
Connect hose H1 from the pump outlet to cold
water line V2 into the heater.
Connect drain hose H2 from hot water outlet
line V1 and route into ve gallon recirculation
container.
Pour approximately four (4) gallons of virgin
food grade white vinegar or citric acid into the
container.
Place pump suction hose H2 into the cleaning
solution.
Open service valves V1 and V2.
Operate the pump. Circulate the cleaning solution
through the water heater for at least 45 minutes.
Turn o the pump.
Purging the Pressure Relief Valve
If a pressure relief valve discharges periodically, this may be due to thermal expansion occurring in a water
supply system in a closed circuit. Contact the water supplier or local plumbing inspector for the best way to solve
this problem. Do not block the pressure relief valve.
Lime Scale Cleaning Procedure
Materials required:
Five gallon container.
Four gallons of virgin food grade white vinegar or virgin food grade citric acid.
Small inline recirculation pump capable of circulating 2 - 4 gpm (8 – 16 l/m).
Set of hoses for connecting recirculation pump to and from the pump and the ve gallon container.
Refer to the diagram to complete this procedure:
Disconnect electrical power to the water heater.
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Rinse the cleaning solution from the water heater by closing service valve V2 and opening valve V4. Flow
water through the heater and into a container or drain for at least ve minutes.
Close valve V1 and open valve V3.
Disconnect all hoses.
It is recommended to clean the water inlet screen at this time. Close valves V3 and V4 to do so. Clean the
water inlet screen and remove any debris.
Replace the screen and open valves V3 and V4 once more. Checks for leaks.
Return heater to operation by following start up instructions.
13
14
15
10
11
12
Electrical Maintenance Warnings
Label all wires prior to disconnection when servicing controls. Wiring errors can
cause improper and dangerous operation. Always verify proper operation after ser-
vicing.
CAUTION
For operating diculties with your unit, please consult the following table for guidance. If you need further
assistance, contact Onsen at 1 800-996-5559 or [email protected], making sure to have your product
information ready including serial number, proof of purchase and error code if shown on the control panel.
TROUBLESHOOTING
NOTE: Please check water heater for a diagnostic code and respond according to the recommendations
found in section “Diagnostic Codes” of this manual.
ISSUE POSSIBLE CAUSE SOLUTION
No power: power
indicator lamp is not lit.
Power outage. Unit requires 120V power. Use unit when power is restored.
Check circuit breaker and reset if needed.
Check ground fault circuit interrupter (GFCI) if circuit
includes one and reset if necessary.
Unit is unplugged. Check power plug and ensure properly plugged.
Plug the power plug properly.
“Smoke” observed coming
from exhaust system
during cold temperatures.
Water vapor produced during
combustion is condensed in the
exhaust as the hot gas is cooled
by the outside air.
None. Normal operation.

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ISSUE POSSIBLE CAUSE SOLUTION
No hot water ow when
a hot water faucet is
opened.
No/empty fuel source. Fuel gas valve needs to be open. Rell source tank
(if applicable).
Open the water inlet valve.
Power outage. Unit requires 120V power to operate.
Flow is too low or becomes too
low (less than 0.66 gpm or
2.5 l/m).
Flow is below the lower limit necessary for stable burner
operation and proper temperature control. Increase the hot
water ow to enable system.
Fuel gas meter special control
restrictions.
Some fuel gas valves may have special control restrictions.
Consult your gas supplier and/or a service professional for
assistance.
Distance from heater to source
is long.
Allow time for hot water to travel through system to reach
the point of use.
Hot water is not the right
temperature (too hot or
too cold).
Temperature set point was reset
due to an extended shutdown of
the unit.
Default settings are restored during extended shutdowns
and custom set points must be re-entered to unit.
Flow is beyond capacity. Desired water ow is above maximum capacity of unit.
Reduce user ows to re-establish control of temperature
Incoming water is too warm. If incoming water to unit is very warm and the ow is just
above minimum requirements, the heat generated by the
burner while operating at minimum capacity can make the
water hotter than desired. Increase the hot water user ow
so that the burner system can control the temperature.
Hot water ow produced
is lower than expected.
Water source is restricted. Check and fully open water inlet valve(s). Check and clean
inlet water screen.
Heat exchanger in unit is scaled. Clean/descale heat exchanger by ushing per maintenance
procedure.
Incoming water temperature is
colder than expected.
Colder than normal incoming supply water will reduce the
amount of hot water than can be produced. Although the
amount of heat output from the unit is still at full capaci-
ty, you must reduce the user ow and operate within the
capacity range of the heater.
Vent system trouble. Vent system is restricted in some
manner.
Check air intake and exhaust ducts to ensure they are not
damaged, corroded, blocked, etc.
Water leaking from pres-
sure relief valve outlet.
Water system is operating above
the pressure rating of the pres-
sure valve.
Consult a professional to investigate.
Safety valve is damaged. Replace safety valve. Consult professional as required.
Blower fan noise can be
heard for some time after
operation stops.
The blower is designed to run for
30 seconds after burner shuts o.
None. Normal operation.

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Whenever a failure occurs, an alert sounds and a diagnostic code is displayed to indicate the failure mode at the
time of occurrence.
The following table includes a list of diagnostic codes that can be displayed as well as recommended remedies
to address the problem.
DIAGNOSTIC CODES
CODE INDICATION SOLUTION
E0
Blower system problem occurred
The blower jammed or stopped operating
because of a foreign object.
The blower fan suered a mechanical break-
down.
The fan power control module has broken
down.
Wiring harness or wiring connection some-
where in fan connection has come loose.
Check to see if fan turns freely. Remove any
foreign objects jamming the fan.
Replace the blower fan.
Replace the control module.
Reconnect the blower wiring to the main board.
E1
Outlet water temperature sensor error
The sensor plug has become loose or is not
connected properly to the circuit board.
The sensor has become defective (a short
circuit, open circuit, or accidental contact with
the casing occurred.)
The circuit board of the main controller mal-
functioned.
Sensor is scaled.
Reconnect the outlet water temperature sensor
wires (CN8) to the main board properly.
Replace the temperature sensor.
Replace the controller.
Clean sensor.
E2
Flame detection error
The detection circuitry for ignition and ame
detection has become loose or failed to
connect.
Ignition sequence was unsuccessful.
An accidental ameout occurred.
The ignition and ame detection circuitry
malfunctioned or broke down. Igniter is not
activating.
Flame sensor is dirty/fouled.
Connect the relevant circuit properly. Replace any
failed circuit elements.
Check fuel gas supply. Check if the fuel gas
pressure is too high or too low.
Check if the fuel gas pressure and water pressure
are normal. Possible air in the fuel gas pipe on
start up. Water pressure is too low causing ow to
drop below required minimum ow.
Replace or repair igniter or ame detection
system.
Inspect ame sensor and clean or replace if
required.
E3
Inlet water temperature sensor error
The sensor plug has become loose or is not
connected properly to the circuit board.
The sensor has become defective (a short
circuit, open circuit, or accidental contact with
the casing occurred.)
The circuit board of the main controller mal-
functioned.
Sensor is scaled.
Reconnect the inlet water temperature sensor wire
(CN8) to the main board properly.
Replace the temperature sensor.
Replace the controller.
Clean sensor.
1.
1.
1.
1.
1.
1.
1.
1.
2.
2.
2.
2.
2.
2.
2.
2.
3.
3.
3.
3.
3.
3.
3.
3.
4.
4.
4.
4.
5.
4.
4.
4.
4.
5.

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CODE INDICATION SOLUTION
E4
High temperature automatic shutdown
Water temperature above 185° F (85° C) for ten (10)
seconds. The controller has automatically closed
the electromagnetic valve and unit is shut down.
Normal safety precaution to protect against a rare
occurrence in which water ow is dramatically
reduced causing a small slug of very hot water.
E5
Overheating occurred
Possible causes include operating at a very high
load for a long period followed by a sudden
event such as excessively low pressure in water
supply or excessively high gas supply pressure.
The thermal fuse has failed due to safeguarding
against overheating.
Normal system function. This should be a very
infrequent event. Correct gas or water supply
issues if there are frequent reoccurrences.
Replace the thermal fuse.
E6
Solenoid valve error
The wiring is loose or a bad connection
occurred.
The solenoid valve is faulty.
Controller has failed.
Mount plug-in wiring properly and replace bad
elements.
Replace solenoid valve.
Repair or replace the controller.
E8
Blower fan system error
The blower jammed or stopped operating
because of a foreign object.
The blower fan suered a mechanical break-
down.
The fan power control module has broken
down.
Wiring harness or wiring connection some-
where in fan connection has come loose.
The pressure vent is jammed.
The pressure switch is damaged.
Remove foreign object and eliminate the cause
that led to a jammed fan.
Replace the blower fan.
Replace control board.
Plug the plug-in element in place, or replace the
bad element.
Replace and/or clean the vent.
Replace the pressure switch.
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Only properly qualied personnel should install this equipment. Improper installation or installation by a
non-qualied installer may void warranty. Failure to comply with state, provincial and local codes pertaining
to water heater installations may also void warranty.
This appliance shall NOT be installed outdoors.
The appliance and its gas connection must be leak tested before placing the appliance in operation. A qualied
installer or service technician should inspect and leak test system before use.
The installation must comply with local codes. In the absence of local codes, the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, or the Natural Gas and Propane Installation Code, CSA B149.1 shall prevail. If installed in
a manufactured home, the installation must conform to the Manufactured Home Construction and Safety
Standard, Title 24 CFR, Part 3280 or the Canadian Standard CSA Z240 MH Series, Manufactured Homes.
INSTALLATION
INSTALLATION GUIDELINES

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WHAT’S INCLUDED IN THE BOX
The following contents are included. If any items are missing, please contact Onsen.
ITEM QUANTITY
Water heater 1
Installation and Operation Manual 1
Pressure relief valve 1
Pipe reducer 2
The appliance must be electrically grounded in accordance with local codes. In the event there are no local
codes, the National Electrical Code, ANSI/NFPA 70, or the Canadian Electrical Code, CSA C22.1 shall prevail.
The gas pressure must be between these values: 3.5” W.C. (870 Pa) and 10.5” W.C. (2610 Pa) for natural gas
and 8.0” W.C. (1990 Pa) 13.0” W.C. (3230 Pa) for liquid propane. The gas pressure must not exceed these limits.
The appliance and its individual shut o valve must be disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in excess of ½ psi (3.5 kPa).
The appliance must be isolated from the gas supply piping system by closing its individual manual shut o
valve during any pressure testing of the gas supply piping system at test pressures equal to or less than ½ psi
(3.5 kPa).
The appliance should be located in an area where leakage of the tank or connections will not result in damage
to the area adjacent to the appliance or to lower oors of the structure. When such locations cannot be
avoided, it is recommended that a suitable drain pan, adequately drained, be installed under the appliance.
The pan must not restrict combustion air ow.
Do not obstruct the combustion air intake or heater exhaust and ensure air intake is not near an area that will
allow chemical fumes to enter the combustion air system.
Do not use to heat pools or spas (hot tubs) that use chemically treated water.
If a water heater is installed in a closed water supply system, such as one having a backow preventer in the
cold water supply line, means shall be provided to control thermal expansion. Contact the water supplier or
local plumbing inspector on how to control this situation.