Noritz EZ111DV User manual

FOR USE IN RESIDENTIAL OR
MANUFACTURED HOME APPLICATIONS.
Thank you for purchasing this Noritz Tankless Gas Water Heater.
Before using:
• Read this manual completely for operation instructions.
• Completely fill out the warranty registration card (included
separately) and mail the detachable portion to Noritz
America Corporation.
• Keep this manual (and the remainder of the warranty
registration card) where it can be found whenever necessary.
Installation must conform with local codes, or in the absence of
local codes, the National Fuel Gas Code, ANSI Z223.1 / NFPA 54
- latest edition and/or the Natural Gas and Propane Installation
Code CSA B149.1- latest edition.
When applicable, installation must conform with the
Manufactured Home Construction and Safety Standard, Title
24 CFR, Part 3280 or the Canadian Standard CAN/CSA-Z240 MH
Mobile Homes, Series M86.
Noritz America reserves the right to discontinue, or change
at any time, the designs and/or specifications of its products
without notice.
NORITZ America Corporation
Owner’s Guide
CONDENSING TANKLESS GAS Water Heater
Models : EZ111DV (GQ-C3260WX-FF US)
EZ98DV (GQ-C2860WX-FF US)
• Do not store or use
gasoline or other
flammable 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 fire
department.
• Installation and service
must be performed by
a qualified installer,
service agency or the
gas supplier.
If the information in this manual is not followed exactly, a fire or explosion may result
causing property damage, personal injury or death.
WARNING
Low NOx Approved by SCAQMD
14 ng/J or 20 ppm
(Natural Gas Only)
SBB8163
Rev. 05/19

2
To prevent damage to property and injury to the user, the icons shown below will be used to warn of varying
levels of danger.
Every indication is critical to the safe operation of the Water Heater and must be understood and observed.
Potential dangers from accidents during installation and use are divided into the following four categories.
Closely observe these warnings; they are critical to your safety.
Important Safety Information
Icons warning of risk level
This is the safety alert symbol. It is used to alert you to potential personal injury hazards.
Obey all safety messages that follow this symbol to avoid possible injury or death.
DANGER Indicates an imminently hazardous situation which, if not avoided, will result in death
or serious injury.
WARNING
I ndicates a potentially hazardous situation which, if not avoided, could result in death
or serious injury.
CAUTION Indicates a potentially hazardous situation which, if not avoided, may result in minor
or moderate injury.
NOTICE Indicates a potentially hazardous situation which, if not avoided, may result in
property damage.
Vapors from flammable liquids will explode
and catch fire causing death or severe burns.
Do not use or store flammable products such
as gasoline, solvents or adhesives in the same
room or area near the Water Heater.
Keep flammable products:
1. Far away from the Water Heater.
2. In approved containers.
3. Tightly closed.
4. Out of children’s reach.
Vapors:
1. Cannot be seen.
2. Vapors are heavier than air.
3. Go a long way on the floor.
4. Can be carried from other rooms to the
main burner by air currents.
After the Water Heater has been out of use
for a long time make sure that you fill the
condensate trap with water.
This is to prevent dangerous exhaust gases
from entering the building.
Failure to fill the condensate trap could result
in severe personal injury or death.
(Refer to page 15 for further instructions.)
DANGER Hot Water Heater temperatures over 125°F
(52°C) can cause severe burns instantly or
death from scalding.
Children, disabled and elderly are at the highest
risk of being scalded.
Feel water temperature
before bathing or showering.
Temperature limiting valves
are available, consult with
installer.
Do not use the Water Heater if the intake/
exhaust pipe is displaced, has holes, is clogged
or is corroded.
This will cause carbon monoxide poisoning
and a potential fire hazard.
Do not allow anyone to change the water
temperature while hot water is being used.
To prevent scalding, do not change the water
temperature to a higher setting.
[When supplying combustion air from the
indoors]
Check whether or not the air supply vent is
blocked with dust, trash, a towel, or the like.
Blocking the opening may result in incomplete
combuson.
Important Safety Information

3
A. This Water Heater does not have a pilot.
It is equipped with an ignition device that
automatically lights the burner. Do not try
to light the burner by hand.
B. BEFORE OPERATING smell all around the
Water Heater area for evidence of leaking
gas. Be sure to smell next to the floor
because some gas is heavier than air and
will settle on the floor.
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 fire department.
C. Use only your hand to turn the gas valve
knob. Never use tools. If the knob will not
turn by hand, don’t try to repair it. Call
a qualified service technician. Force or
attempted repair may result in a fire or
explosion.
D. Do not use this Water Heater if any part
has been under water. lmmediately call a
qualified service technician to inspect the
Water Heater and to replace any damaged
parts.
When a gas leak is noticed:
1. Stop use immediately.
2. Close the gas valve.
[Indoor Installation]
3. Open windows and doors.
If you detect abnormal combustion or
abnormal odors, or during an earthquake,
tornado or fire:
1. Turn off the hot water supply.
2. Turn off the power to the Water Heater.
3. Turn off gas and water supply valves.
4. Call the nearest Noritz agent.
Explosion Hazard;
If the temperature and pressure relief valve
is dripping or leaking, have a qualified service
technician replace it. Do not plug or remove
the valve.
Failure to follow these instrucons can result in
re or explosion, and personal injury or death.
Check the temperature of the running hot
water before entering the shower.
Check the temperature before stepping into
the bathtub.
To prevent burns or scalding, turn off the
button and wait until the appliance cools
before performing maintenance.
WARNING
Do not place the exhaust vent terminal in an
indoor environment by means of adding walls
and ceiling (Do not enclose using corrugated
sheets, etc.).
Carbon monoxide poisoning or re may occur
as a result.
Leave the proper clearance between the
Water Heater and nearby objects (trees,
timber, boxes with flammable materials, etc.).
Do not place combustibles such as laundry,
newspapers, oils etc. near the heater or the
exhaust vent terminal.
Do not install this Water Heater in a
recreational vehicle or on a boat as this may
be a Carbon Monoxide Poisoning Hazard.
Do not install this Water Heater in a mobile
home when using SV conversion kit (“-SV”
configuration).
Do not use combustible chemicals such as oil,
gasoline, benzene etc. in the near the heater
or the exhaust vent terminal.
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity of
this or any other appliance.
Do not place or use a spray can near the
Water Heater or the exhaust vent terminal.
Important Safety Information
*Indicates suggested clearances for maintenance.
[Outdoor Installation]
Left side:
3 in. (76 mm)
or more Right side:
3 in. (76 mm)
or more
Front:
24 in. (610 mm)*
Top:
36 in. (910 mm) or more
Left side:
3 in. (76 mm)
or more Right side:
3 in. (76 mm)
or more
Front:
24 in. (610 mm)*
3 in.(76 mm)
from exhaust
vent pipe*
Top:
12 in.(300 mm)
or more
[Indoor Installation]

4
[When supplying combustion air from the
indoors]
Check the air supply opening for dust or
obstructions.
To prevent injury or death, do not allow small
children to bathe or play in the bathroom
unsupervised.
Do not touch the power cord with
wet hands.
Contact a qualified service technician for any
necessary repairs, service or maintenance.
Do not use parts other than those specified
for this appliance.
California Proposition 65 lists chemical
substances known to the state to cause
cancer, birth defects, death, serious illness or
other reproductive harm. This product may
contain such substances, be their origin from
fuel combustion (gas, oil) or components of
the product itself.
The gas conversion kit shall be installed by
a qualified service agency in accordance
with the manufacturer’s instructions and all
applicable codes and requirements of the
authority having jurisdiction. The information
in the instructions must be followed to
minimize the risk of fire or explosion or to
prevent property damage, personal injury,
or death. The qualified service agency is
responsible for the proper installation of
this kit. The installation is not proper and
complete until the operation of the converted
appliance is checked as specified in the
manufacturer’s instructions supplied with the
kit.
If the appliance is installed in a location with
very high humidity, condensate may form
inside the unit and/or cause incomplete
combustion, damage to the electrical
components, or electric leakage.
Do not turn off the Water Heater while
someone is bathing.
Do not cover the Water Heater and the
exhaust vent terminal, store trash or debris
near it, or in any way block the flow of fresh
air to the appliance.
Do not touch the exhaust vent pipe and
exhaust vent terminal during or immediately
after operation of the Water Heater.
Be sure the gas/power supplied matches
“Type of Gas” and “Electrical Rating” on the
rating plate.
Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.
Consult the nearest Noritz agent if the Water
Heater location needs to be changed.
If this appliance will be installed in a location
where hair spray or aerosols will be used,
locate the appliance in a separate area that is
supplied with fresh air from outdoors.
Do not use hair spray or spray detergent in the
vicinity of the appliance.
Avoid installation in places where dust or
debris will accumulate.
Dust may accumulate and reduce the
performance of the unit’s fan.
This can result in incomplete combustion.
WARNING
Important Safety Information
Be sure to electrically ground the appliance.
Keep power cord free of dust.
Do not use the Water Heater for other than
hot water supply, shower and bath.
Do not use a broken or modified power cord.
Do not bind, bend or stretch power cords.
Do not scratch, modify, or subject them to
impact or force.
Do not use condensate, discharged from the
condensate drain pipe, for drinking or for
consumption by animals.
CAUTION
(e.g. EZ111DV (GQ-C3260WX-FF US))

5
Important Safety Information
Do not drink water that has been inside the
appliance for an extended period of time. Do
not drink the first use of hot water from the
appliance in the morning.
Clean the filter on the water inlet as
frequently as required by the quality of
your local water.
Keep the area around the appliance clean.
If boxes, weeds, cobwebs, cockroaches etc. are
in the vicinity of the appliance, damage or fire
can result.
Do not install the appliance where the
exhaust will blow on walls or windows.
If the water supply is in excess of 12 gpg
(200 mg/L) of hardness, acidic or otherwise
impure, treat the water with approved
methods in order to ensure full warranty
coverage. (See page 17)
Problems resulting from scale formation are
not covered by the warranty.
Check ignition during use and extinction after
use.
Do not run water through the appliance when
appliance is not on.
When discharging hot water, make sure the
appliance is ON. If water is run through the
appliance with the appliance OFF, water may
condense inside the appliance and cause
incomplete combustion or damage to the
internal electrical components.
For single-handle fixtures, you’d turn the handle
to the left.
This appliance is only approved for installation
up to 4,500 ft (1,350 m) above sea level.
For installations at higher elevations, contact
Noritz America for Instructions.
NOTICE Do not disassemble the Remote Controller.
Do not use chlorine-based, acidic, alkaline
detergents, organic solvents such as benzine
and thinner, or Melamin Sponge to clean the
Remote Controller.
This may cause discoloration, deformation,
scratches or cracks.
Do not splash water on the Remote Controller.
Do not expose the Remote Controller to
steam.
Although it is water resistant, too much water
can cause damage.
Do not locate the Remote Controller near
stoves or ovens.
This may cause damage or failure.
Contact Noritz before using with a solar pre-
heater.
Preventing damage from freezing (See page
13)
• Damage can occur from frozen water within
the appliance and pipes even in warm
environments. Be sure to read below for
appropriate measures.
• Repairs for damage caused by freezing are
not covered by the warranty.
Take necessary measures to prevent freezing
of water and leakage of gas when leaving the
appliance unused for long periods of time.
(See page 14)
If it is snowing, check the exhaust vent
terminal for blockage.

6
Contents
Important Safety Information............... 3
Contents............................................... 5
General Parts........................................ 7
Water Heater ........................................ 7
Remote Controller ................................ 8
Initial Operation ................................... 9
Using the Water Heater ........................10
Setting Hot Water Temperature ............11
Customizable Settings...........................12
Limiting the Maximum Output
Temperature.......................................... 12
Muting the Remote Controller ............. 12
Flow Meter Alarm ................................. 12
Preventing Damage from Freezing .......13
Regular Maintenance ...........................16
Troubleshooting ...................................18
Follow-up Service ................................. 21
Specifications .......................................23
Contents

7
The condensing tankless gas Water Heater tends to
emit white steam.
After the exhaust gas passes through the secondary
Heat Exchanger, the low temperature and high
moisture content tends to produce steam at the vent
discharge terminal.
This is a normal occurrence.
General Parts
This illustration shows an example of installation.
The exact installation configuration may be slightly different.
Water Heater
The condensing tankless gas Water Heater discharges condensate.
When heat from the exhaust gas is collected within the secondary Heat Exchanger, condensation occurs
from moisture in the exhaust gas and the resulting water is discharged from the condensate drain pipe
(approximately 2 gallons/h (7.5 L/h) maximum). It is not a water leak. Do not plug or block the drain line as it
must always be allowed to freely flow.
Note : The condensate discharged is acidic with a pH level of approximately 2-3. A condensate neutralizer
may be required by local code prior to disposal.
General Parts
During combustion, white
steam may often be seen.
This is normal.
Indoor Installation
7
3
4
8
9
5
6
Outdoor Installation
Outdoor Vent Cap
1 2 Flex Vent 2 in. Conversion Kit
1. Intake Pipe
2. Exhaust Pipe
3. Pressure Relief Valve
4. Hot Water Valve
5. Water Supply Valve
6. Water Drain Valve (with
Water Filter)
Inside Water Inlet (See page 17)
7. Front Cover
8. Gas Supply Valve
9. Condensate Drain Pipe
Discharge the condensate.

8
• What is actually displayed depends on how the Water Heater is set.
• Before use, remove the protective sheet from the Remote Controller surface.
Remote Controller (RC-7651M-A)
General Parts
4
5
6
2
1
NOTE As shipped from the factory, the
Remote Controller is set to display in
°F and gallons.
To adjust the display to °C and liters,
refer to the Installation Manual.
1. POWER Button / Indicator
For turning the Water Heater ON/OFF.
2. SETTINGS Buon
For setting the flow meter alarm, and other
settings.
3. / Buttons
For setting the hot water temperature, the flow
meter alarm, and other settings.
4. PRIORITY Indicator
When this indicator is displayed, the hot water
temperature can be set.
5. BURNER ON Indicator
When burning, the indicator is displayed.
6. - Temperature Setting (e.g. 110°F)
- Flow Meter Setting (See page 12)
- Error Code
A number will blink if a failure occurs.
(See page 20)
3

9
Initial Operation
Before the first use, do the following:
Initial Operation
Do not touch the power cord with wet
hands.
WARNING
4. Turn on the power.
1. Open the water supply valve.
CLOSED OPEN
2. Open a hot water fixture/faucet to confirm
that water is available, and then close the
fixture/faucet again.
Hot water
fixture/faucet
3. Open the gas supply valve.

10
(e.g. 110°F)
2. Turn on hot water.
1. The button is ON.
Using the Water Heater
• To prevent scalding :
Hot Water Heater temperatures over 125°F
(52°C) can cause severe burns instantly or
death from scalding.
• Children, disabled and elderly are at the
highest risk of being scalded. Feel water
temperature before bathing or showering.
Temperature limiting valves are available,
consult with installer.
• When setting the Water Heater to 125°F (55°C
in °C mode) or higher, the temperature display
will blink for 10 seconds and emit a tone as a
high temperature warning.
• Take caution when using the Water Heater
again after setting to 125°F (52°C) or higher.
Always check the set temperature before use.
• Do not allow anyone to change the water
temperature while hot water is running.
DANGER
Operation
• The POWER indicator is displayed.
• The previously set hot water supply
temperature is shown.
• The setting temperature displayed may vary
from the actual temperature at the fixture
depending on conditions such as season or
length of piping.
• Turn off hot water, the BURNER ON indicater
disappears.
Using the Water Heater
PRIORITY indicator is displayed.
BURNER ON indicator is
displayed during combustion.

11
(e.g. 110°F)
(e.g. 105°F)
2. Set the temperature using the / buttons.
1. The button is ON.
Operation
• The POWER indicator is displayed.
• The previously set hot water supply
temperature is shown.
Temperature Setting Options
The temperature settings below are examples.
The temperature setting necessary depends on the usage,
the length of piping and the season.
[When using °F mode] (Default setting is 110°F)
[When using °C mode] (Default setting is 40°C (104°F))
100°F Washing dishes, etc.
105°F
Shower, hot water supply, etc.
110°F
115°F
120°F
125°F High temperature*
(The maximum output temperature
can be set using the Remote
Controller. (See page 12))
130°F
135°F
140°F
37°C (99°F) Washing dishes, etc.
38°C (100°F)
39°C (102°F)
Shower, hot water supply, etc.
40°C (104°F)
41°C (106°F)
42°C (108°F)
43°C (109°F)
44°C (111°F)
45°C (113°F)
46°C (115°F)
47°C (117°F)
48°C (118°F)
50°C (122°F)
55°C (131°F) High temperature*
(The maximum output temperature
can be set using the Remote
Controller. (See page 12))
60°C (140°F)
Setting Hot Water Temperature
* Display when high temperature is set
(e.g. 125°F)
Setting Hot Water Temperature
NOTE • Hot water temperatures shown
are approximate and may differ
from the actual temperature at
the fixture depending on external
factors such as the season and
length of piping in the system.
• When low temperatures are set
(for washing dishes, etc.), if the
incoming water temperature
is already quite high, it may be
difficult to ensure the outgoing
water temperature is as per the
setting.
• Check the temperature displayed
before using any hot water.
Be especially careful using hot
water after the set temperature
has been changed.
• When the hot water temperature
is adjusted using thermostatic
water mixing valves, set the
temperature on the Remote
Controller approximately 20°F
(10°C) higher than the required
temperature to ensure the
appropriate fixture temperature.
• For most residential applications,
the recommended setting
temperature is 120°F (50°C in °C
mode) or less.
NOTE • Consult local codes for minimum
operating temperatures.
• Noritz recommends that water
temperature is set as low as
possible to prevent scale build-up
in the Heat Exchanger.
PRIORITY indicator is displayed.
Blink for 10 seconds

12 Customizable Settings
Limiting the Maximum Output
Temperature
The maximum output
temperature can be limited to
prevent discharging hot water at
too high of a temperature.
Muting the Remote Controller
The Remote Controller will
emit a sound when any button
is pressed. This sound can be
muted if it is desired.
2. Press and hold the
button until a sound is heard
(approximately 2 seconds).
1. Press and hold the
button for 5 seconds.
3. Change the temperature
using the / buttons.
(Setting completed)
Operation Operation
Customizable Settings
• Set the button to ON when
continuing to use the unit as
is. Otherwise, let the unit sit
for approximately 30 seconds.
(e.g. 120°F)
(Default setting = 120°F/50°C)
[For Fahrenheit (°F)]
100 - 140°F (In 5°F intervals)
[For Celsius (°C)]
37- 48°C (In 1°C intervals),
50- 60°C (In 5°C intervals)
Flow Meter Alarm
The flow meter alarm is being
used to indicate when a tub is full.
1. The button is ON.
2. Set the temperature using
the / buttons.
4. Turn on hot water.
5. Turn off the hot water when
the alarm sounds to prevent
overfilling.
Operation
• Check the current setting
temperature.
• The flow meter setting will be
blinking.
• The alarm will not sound if it
is set for 990 gal (990 L).
• The level can only be adjusted
while the flow meter setting is
blinking.
• After 10 seconds, the Remote
Controller will again display
the temperature.
• The flow meter alarm cannot
be muted.
• The high temperature warning
tone when setting the unit to
125°F/55°C (131°F) or higher
will not emit a sound when
muted.
• When the tub fills with the
preset volume of water, an
alarm will sound alerting you
to shut off the water.
3. Press the button, and
adjust with the / buttons.
(Default setting = 990 gal (990 L))
[For gallon]
10- 60 gal (In 5 gal intervals),
60- 100 gal (In 10 gal intervals),
990 gal
[For liter]
40- 240 L (In 20 L intervals),
240- 380 L (In 40 L intervals),
990 L
[Muted]
No sound after 5 seconds
[Sound]
The sounds after 5 seconds
1. The button is OFF.
(Default setting = Sound)
NOTE • The hot water filling
temperature is
same as the setting
temperature.
• Although the
temperature can be
set to 125°F/50°C
or higher, do not set
the temperature to
125°F/50°C or higher
as it can cause severe
burns instantly or
death from scalding.

13
Freezing cannot be prevented when the power plug
is unplugged. Do not remove the power plug from
the wall outlet.
Freezing will be prevented regardless of whether
the button is ON or OFF.
• In normal operation, freezing is prevented within
the Water Heater automatically unless the
outside temperature without wind is below-30°F
(-35°C) when supplying combustion air from the
outdoor (Direct Vent) or -4°F (-20°C) when the
Water Heater is installed outdoors.
• For indoor installation, when supplying
combustion air from the indoors, the room
temperature must be greater than 32°F (0°C) to
prevent freezing and the room inside must not
have negative pressure.
• The freeze prevention heaters will not prevent
the plumbing external to the Water Heater from
freezing. Protect this plumbing with insulation,
heat tape or electric heaters, solenoids, or pipe
covers. If there remains a freezing risk, contact
the nearest Noritz agent.
This method can protect not only the Water Heater,
but also the water supply, water piping and mixing
valves.
* Outside temperature including wind chill factor less
than -30°F (-35°C) when supplying combustion air
from the outdoor (Direct Vent) or -4°F (-20°C) when
the Water Heater is installed outdoors.
Take the measures below for extremely
cold temperatures*.
Preventing Damage from Freezing
• Damage can occur from frozen water within
the appliance and pipes even in warm
environments. Be sure to read below for
appropriate measures.
• Repairs for damage caused by freezing are not
covered by the warranty.
NOTICE
Freezing is prevented within the device
automatically by the freeze prevention
heater.
NOTE • Remember to set mixing valves
and fixtures to their original levels
before using the Water Heater
again to prevent scalding.
• If there is still a risk that the Water
Heater will freeze, drain the Water
Heater as shown on the next page.
1. Turn off the button.
2. Close the gas supply valve.
3. Open a hot water fixture/faucet, and keep a
small stream of hot water running. (0.1 gallon
(400 mL)/minute or about 0.2 in. (4 mm)
thick.)
• If there is a mixing
valve, set it to the
highest level.
• When linking
multiple Water
Heaters, discharge
water equivalent to
(0.1 gallon (400 mL)/
minute per Water Heater.)
4. The flow may become unstable from time to
time. Check the flow 30 minutes later.
• In general, it is not advisable to run water
through the Water Heater when it is
OFF (See page 5), but in this case freeze
prevention is more important.
0.2 in. (4 mm)
thick
Hot water fixture/faucet
NOTE If the Water Heater or the piping is
frozen, do not use the Water Heater
or it may get damaged.
1. Close the gas and water valves.
2. Turn off the button.
3. Open the water supply valve from time to time
to check whether water is running.
4. When the water is flowing again, check for
water leaks from the Water Heater and piping
before using.
If water will not flow because it is frozen
Preventing Damage from Freezing

14
8. When the water is completely drained, reattach
all drain plugs and close the hot water fixtures/
faucets.
7. Open the drain plug, and then drain the water
out of the Water Heater.
• To prevent damage from freezing, the Water
Heater must be plugged into power at all
times. If power is unplugged, drain the water
completely from the Water Heater. Then use an
air compressor to remove all water from inside
the water piping of the Water Heater.
• It is recommended that Isolation Valves are
installed on the Water Heater, otherwise the
water connections will need to be removed to
drain the Water Heater completely.
• Freeze damage due to not draining properly will
not be covered under warranty.
• Drain water into a bucket to prevent water
damage.
If the Water Heater will not be used for a
long period of time, drain the water.
Preventing Damage from Freezing
Drainage Using the Remote Controller
1. The button is OFF.
2. Press and hold the button
until a sound is heard
(approximately 2 seconds).
• The maximum hot water
temperature will blink.
3. Press the button several
times until the item number
“5” is displayed.
4. Press the button.
• The display will change from
“oF” to “on”.
5. Close the water supply valve.
6. Fully open all hot water fixtures/faucets.
7. Open all drain plugs and drain the water out of
the Water Heater.
8. When the water is completely drained, reattach
all drain plugs and close the hot water fixtures/
faucets.
(e.g. 120°F)
Hot water fixture/faucet
9. Close the gas valve and disconnect
the electrical power supplied to
the Water Heater.
Do not touch with wet hands.
• To prevent burns or scalding, turn off the
button and wait until the appliance cools
before performing maintenance.
• Do not touch the power cord with wet hands.
WARNING
1. Close the gas valve.
2. The button is ON.
3. Turn and leave open the hot water fixtures/
faucets for more than 2 minutes and close.
• If multiple Water Heaters are being used, drain
2 minutes for each Water Heater.
• An 11 Error Code may appear on the Remote
Controller. This is not a malfunction of the
Water Heater. Do not turn the button OFF.
4. Close the water supply valve and disconnect the
electrical power supplied to the Water Heater.
5. Fully open all hot water fixtures/faucets.
6. Open the drain plug.
Hot water fixture/faucet
Do not touch with wet hands.
Manual Draining
Drain Plug
Drain Plug

15
Preventing Damage from Freezing
Turning the Water Heater Back On
After the Water Heater has been out of use for a
long time, make sure that you fill the condensate
trap with water.
This is to prevent dangerous exhaust gases from
entering the building.
Failure to fill the condensate trap could result in
severe personal injury or death.
(By performing step 4 as described below, the
condensate trap will automatically fill itself with
water.)
DANGER
1. Check that all drain plugs are inserted.
2. Check that all hot water fixtures/faucets are
closed.
3. Open the water supply valve.
4. Open a hot water fixtures/faucets to confirm
that water is available, and then close the hot
water fixtures/faucets again.
5. Open the gas supply valve.
6. Connect the electrical power.
Do not touch with wet hands.
7. Make sure that the area around the appliance
is well ventilated; open a window or a door
if necessary. Then, operate the Water Heater
and verify that condensate is coming out of
the condensate drain pipe. (During normal use
of the Water Heater, condensate will begin to
discharge from the condensate drain pipe within
15 minutes of use. However, depending on the
season and/or installation site conditions, it may
take longer.)
NOTE If water does not appear at the end
of the drain line, a qualified service
technician must clean the condensate
line.
Do not touch the power cord with wet hands.
WARNING

16 Regular Maintenance
Periodic Inspection
Periodic Maintenance
Regular Maintenance
Check : B
For dust and soot in the exhaust vent or the
exhaust vent terminal.
Check : C
• For abnormal sounds during operation.
• For abnormalities in external appearance,
discoloration or flaws.
Check : D
For proper operaon of pressure relief valve.
Check : E
For water leaks from the Water Heater and piping.
Check : F
For blockage at the condensate drain pipe
discharge.
Check
For laundry, newspaper, mber, oil, spray cans and
other combusble materials near the Water Heater
or the exhaust vent terminal.
Water Heater
Remote Controller
Wipe the outside surface with a wet cloth, then dry
the surface. Use a neutral detergent to clean any
stains.
If an external condensate neutralizer is installed,
periodic replacement of the neutralizing agent will
be required. Refer to the instrucons supplied with
the neutralizer for suggested replacement intervals.
Wipe the surface with a wet cloth.
NOTE •
Do not use chlorine-based, acidic,
alkaline detergents, organic solvents
such as benzine and thinner, or
Melamin Sponge to clean the
Remote Controller.; discoloration,
deformation, scratches or cracks may
occur.
• The Remote Controller is water
resistant but not water proof. Keep
it as dry as possible.
Check : A
[When supplying combustion air from the indoors]
For smear or blockage with dust, oil, etc. at the air
supply vent.
If blocked, remove the build-up with a vacuum
cleaner or damp towel.
NOTE Do not permanently remove the Inlet
Screen.
Air Intake
(Flex Vent 2 in.
Conversion Kit)
Air Intake
(SV Conversion Kit)
Periodic check and maintenance should be
performed once a year by a qualified service
technician to assure that all the equipment is
operating safely and efficiently.
We recommend to make necessary arrangements
with a service contractor.
To prevent burns or scalding, turn off the
button and wait until the appliance cools before
performing maintenance.
WARNING
E
C
D
A
F
B

17
Water Drain Valve (with Water Filter)
If the water drain valve (with water filter) is covered
with debris, the hot water may not run smoothly,
or the Water Heater may put out cold water. Check
and clean the filter as explained below.
• For people who live in a hard water area, periodic
flushing is necessary. If the Heat Exchanger is not
flushed, the Scale Build-up may cause damage to
the Heat Exchanger.
To prevent damage to the Heat Exchanger, the
Heat Exchanger regularly needs to be flushed.
• This Water Heater is equipped with an automatic
service reminder to announce for flushing the
Heat Exchanger.
The factory default of this service reminder is
disable.
If desired, the customer or installer needs to
enable the service reminder (connect the red
connector marked “SERVICE REMINDER”).
Refer to the “Water Treatment: About the Service
Reminder” in the Installation Manual.
• If the service reminder is selected to ON, the
code “C1#”(#=1,2,3,4 ... 9) will displayed on the
Remote Controller after the set time period has
been reached. When the code is displayed, the
Heat Exchanger needs to be flushed to prevent
damage from Scale Build-up. Refer to the
“Procedure for flushing the Heat Exchanger” in
the Installation Manual or contact Noritz America
for more information. (http://support.noritz.com/
or 1-866-766-7489)
• Damage to the Water Heater as a result of below
is not covered by the Noritz America Limited
Warranty. To ensure full warranty coverage, treat
or condition water that exceeds the target levels
provided in this table.
- Water in excess of 12 gpg (200 mg/L) of
hardness
- Poor water quality (see the following table)
- The Water Heater has displayed a “C1#”
(Service Reminder) indicating Scale Build-up,
but the Heat Exchanger has not been flushed.
Contaminant Maximum Allowable Level
Total Hardness* 200 mg/L (12 gpg) or less
Aluminum 0.05 to 0.2 mg/L or less
Chloride 250 mg/L or less
Copper 1.0 mg/L or less
Iron 0.3 mg/L or less
Manganese 0.05 mg/L or less
pH 6.5-8.5
Total Dissolved Solids 500 mg/L or less
Zinc 5 mg/L or less
Sulfate 250 mg/L or less
Residual chlorine* 4 mg/L or less
Source: EPA National Secondary Drinking Water
Regulations (40 CFR Part 143.3)
* Maximum limit suggested by Noritz.
Water Quality and Maintenance
Regular Maintenance
1. Close the hot water valve and the water supply
valve.
2. With a bucket ready, remove the water drain
valve.
3. Clean the water filter with a brush under
running water.
4. Reattach the water drain valve (with water
filter).
NOTE Do not lose the O-Ring.
NOTE Approximately 0.83 gallon (3.1 L) of
water will drain out.
To prevent burns or scalding, turn off the
button and wait until the appliance cools before
draining the water.
WARNING
O-Ring
Water drain valve
with water filter
Hot water valve
Water supply
valve
5. Open the hot water valve and the water supply
valve.
Check that water does not leak from the water
drain valve.

18 Troubleshooting
Initial Operation
Troubleshooting
The Water Heater does not attempt to ignite
when water is running.
• Check for reversed plumbing or crossed pipes.
• Check the water filter. (See page 17)
The Water Heater attempts to ignite but fails.
• Reset the Water Heater and try again. There may
be air in the gas line.
• Have a professional check the gas supply
pressure.
The hot water is not the correct temperature.
• Is the hot water fixture/faucet sufficiently open?
Water takes time to become hot when turning
the hot water fixture/faucet.
• Have you allowed enough time for the cold water
in the pipes to drain out?
The water is too hot.
• Are the gas and water supply valves fully open?
• Is the water temperature setting appropriate?
(See page 11)
• If the water supply temperature is high, it is
possible for the temperature to be higher than
the temperature set on the Remote Controller.
• If only a small amount of hot water is demanded,
it is possible for the temperature to be higher
than the temperature set on the Remote
Controller.
The water is not hot enough.
• Are the gas and water supply valves fully open?
• Is the water temperature setting appropriate?
(See page 11)
• If the amount of hot water required is very
high, it is possible for the temperature to be
lower than the temperature set on the Remote
Controller. Decrease the amount of hot water
passing through the Water Heater and the
temperature should stabilize.
The water is cold when only a single fixture is
open.
• The unit will not heat the water if the flow rate is
less than 0.29 GPM (1.1 L/min)*.
Open the fixture more or open other fixtures so
that a greater flow passes through the unit, and
the unit should begin heating again.
*Minimum activation flow rate: 0.5 GPM (2.0 L/min)
Minimum operating flow rate: 0.29 GPM (1.1 L/min)
Fluctuations in hot water temperatures.
• Set water temperature at 115°F to 120°F or 48°C
(118°F) to 50°C (122°F). This will allow you to
use a higher flow of hot water thus meeting the
minimum flow requirement of 0.29 GPM (1.1 L/
min)*.
*Minimum activation flow rate: 0.5 GPM (2.0 L/min)
Minimum operating flow rate: 0.29 GPM (1.1 L/min)
• Clean the water filter of any debris (See page 17)
Setting temperature cannot rise.
• Is the maximum temperature setting
appropriate? (See page 12)
Temperature
Hot water is not available when a fixture is
opened.
• Are the gas and water supply valves fully open?
• Is the water supply cut off?
• Is the hot water fixture/faucet sufficiently open?
• Is the gas being cut off by the gas meter? (Can
other gas devices such as stoves be used?)
• (For LP) Is there enough gas in the tank? (Can
other gas devices such as stoves be used?)
• Is the water filter clogged? (See page 17)
• Is the button turned ON?
No water is available when a fixture is opened.
• Is the water supply cut off?
• Is the Water Heater frozen?
Remote Controller
The POWER indicator does not light up.
• Has there been a power failure?
• Is the power connected properly?
The water temperature changes after a power
failure or when the power is disconnected.
• The temperature setting and the flow meter
alarm setting may both need to be reset after a
power outage.
The plastic on the surface or buttons of the
Remote Controller has torn, peeled, or air
bubbles inside.
• The surface of the Remote Controller is affixed
with a protective sheet (to prevent surface
scratching, etc.) at time of shipment. This sheet
can be removed or left as it is. When leaving
the protective sheet on, areas frequently
touched may tear or peel. However, the Remote
Controller will not malfunction from water
entering such torn or peeled areas. To restore
the appearance of the Remote Controller
surface, simply remove the protective sheet.

19
Troubleshooting
Amount of Hot Water
The amount of hot water at a certain fixture is
not constant.
• When hot water is demanded at other fixtures,
the amount available may be reduced.
The maximum flow available from EZ111DV (GQ-
C3259WX-FF US) is 8.7 GPM (33 L/min) at a 45°F
(25°C) temperature rise.
The maximum flow available from EZ98DV (GQ-
C2859WX-FF US) is 7.6 GPM (29 L/min) at a 45°F
(25°C) temperature rise.
• Pressure fluctuations and other plumbing
conditions can cause the temperature and
pressure at a fixture to be unstable, but it should
stabilize after a short time.
• There are some types of hot water taps that
discharges large volumes of hot water at first but
stabilize after time.
• To keep the temperature stable, the Water
Heater limits the amount of water that can flow
through it to a small amount initially, but the
amount increases over time.
The amount of hot water in the tub is less/more
than the set amount.
• When hot water is used for other fixtures while
filling the tub, the tub will not fill as much.
• If there is water in the tub already, or when filling
is stopped and restarted, the tub will fill more.
The flow meter alarm does not sound even when
filled to the set amount.
• The flow meter alarm is set to sound when hot
water is continuously discharged for the set
volume of water.
If mixing valves are used, or if cold water is mixed
with hot water at the fixture, the tub will fill
more than the setting of the flow meter alarm.
Amount of hot water available has decreased
over time.
• Is the water filter clogged? (See page 17)
• If the supply water is hard and has not been
treated, scale can build-up in the Water Heater
and decrease the maximum amount of hot water
available. Scale can be removed from the Water
Heater by flushing the Water Heater periodically.
To prevent scale from forming in the Water
Heater, a water softener or scale inhibitor is
recommended.
Other
The Water Heater stops burning during operation.
• Are the gas and water supply valves fully open?
• Is the water supply cut off?
• Is the hot water fixture/faucet sufficiently open?
• Is the gas being cut off by the gas meter? (Can
other gas devices such as stoves be used?)
• (For LP) Is there enough gas in the tank? (Can
other gas devices such as stoves be used?)
White smoke comes out of the exhaust vent on a
cold day.
• This is normal. The white smoke is actually
steam.
The hot water is turbid.
• This is harmless. Small bubbles appear as the air
in the water is heated and depressurized rapidly
to atmospheric pressure.
The water appears blue.
The tub/wash-basin has turned blue.
• Coloration to a blue color may be noticed from
small traces of copper ion contained in the
water and fat (furring). However, there are not
problems concerning health. Coloration of the
tub/wash-basin can be prevented by cleaning
frequently.
Frequent water discharge from the condensate
drain pipe.
• Condensation forms inside the Water Heater
during operation and is discharged from the
condensate drain pipe.
Sounds
The fan can be heard after operation is stopped.
A motor can be heard when turning the Water
Heater on or off, when opening or closing a
fixture, or after the Water Heater has been
running for a while.
• These noises indicate the proper operation of
devices which are designed to let the Water
Heater reignite more quickly, and ensure the
water temperature is stable.

20 Troubleshooting
Check for an Error Code on the Remote
Controller
Contact Noritz America if:
• Any other error code appears.
• An error code is indicated again after the above
actions were followed.
• There are any other questions.
Error Code : 11
Cause : Ignition failure
Action : Check whether the gas valve is open. Press
the button to turn the Water Heater off,
open a hot water fixture/faucet, and turn
the Water Heater back on. If the blinking
number doesn’t return the problem is
solved.
Error Code : 90
Cause : [When supplying combustion air from the
indoors]
The air supply vent may be clogged.
Action : Check air supply vent for blockage or
obstruction. (See page 16)
Cause : Exhaust vent may be clogged.
Action : Check exhaust vent for blockage or
obstruction.
Cause : Abnormal combustion, low gas supply
pressure.
Action : Have a professional check the gas supply
pressure.
Cause : Condensate drain line may be clogged.
Action : Check condensate drain line is clogged or
frozen. If the display continues, contact
nearest Noritz agent.
Error Code : 99
Cause : Abnormal combustion
Action : Contact the nearest Noritz agent.
Error Code : C1# (# = 1-9)
Cause : Service Reminder (Notice for periodic
maintenance)
Action : This Water Heater is equipped with an
automatic service reminder.
Excessive scale build-up may cause
premature failure of the Heat Exchanger.
Excessive dust or lint build-up in the fan
and air intake may affect efficiency and
combustion performance.
Contact Noritz America for additional
information about recommended
maintenance procedures (1-866-766-
7489).
When a failure occurs, information relating to the
error blinks on the display.
If this occurs, take appropriate measures as the
following list.
Blinking