Rinnai REU-V3237FFU User manual

Operation/InstallationManual
To Suit Models:
(Residential and Commercial for indoor and outdoor unit)
ANS Z21.10.3"CSA 4.3
WARNING: If the information in these instructions is not followed
exactly, a fire or explosion may result causing property damage,
personal injury or death.
– 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.
REU-V3237FFU
REU-V3237FFUC
REU-V3237W
REU-V3237WC
REU-V3237FFU-ASME
REU-V3237FFUC-ASME
REU-V3237W-ASME
REU-V3237WC-ASME
R98i
R98e
C98e
C98i

2
Rinnai Corporation V3237 Models
CONTENTS
................................................................................ 3
.......................................................................... 4,5
..................................................... 6
............................................. 7
................................................................... 8
............................................................................. 9
.................................................... 10
...................................................... 11
................................................... 12,13,14,15,16
............................... 17
...................................................................... 18,19
............................. 20,21,22,23
................................. 24
.................................... 25
............................................................. 25,26
.................................................. 26
............................................................. 27-50
........................................................................................... 51
Specifications
Limited Warranty
Owner’s Installation Information
Features of Your New Water Heater
Safety Considerations
Basic Operation
General Controller Information
Remote Controller Operation
Deluxe Controllers
Controllers Set Pattern/Temperature Tables
Error Messages
Maintenance & Service Information
Trouble Shooting and Common Questions
For Your Safety Read Before Operating
Operating Instructions
Care & Lime Condition Warning
Installer’s Instructions
Notes
U273-430(00).indd 2 06.2.8 10:36:39 AM

3
Rinnai Corporation V3237 Models
SPECIFICATIONS
Efficiency
Rating
Electrical
Consumption
Minimum
Gas Supply
Pressure
Maximum
Gas Supply
Pressure
Model V3237FFU V3237FFUC V3237W V3237WC
Minimum Gas Consumption Btu/h
Maximum Gas Consumption Btu/h
Hot water capacity, (50°F rise)
Hot water capacity, (35°F rise)
Factory TemperatureSetting (no Controller)
Default Controller Temperature Setting
Maximum Temperature Setting
Minimum Temperature Setting
Weight Natural Gas
Propane
Noise level Normal
Standby (1 controller ON)
Anti-frost Protection
By-Pass Control
Natural Gas
Propane
Natural Gas
Propane
Type of Appliance
Operation
Exhaust System
Approved Gas Type
Service Connections
Ignition System
Electric Connections
Water Temperature Control
Water Supply Pressure
Maximum Water Supply Pressure
Remote Control Cable
Safety Devices
140°F
140°F
185°F
120°F
104°F
140°F
140°F
140°F
185°F
120°F
104°F
140°F
80％
84％
99watts
82％
85％
72watts
19,000
237,000
0.6 to 8.0 GPM
0.9 to 9.8 GPM
98°F
55 Lbs.
49 dB (A)
2 watts
116 watts
Electronic
6" W.C.
10" W.C.
10.5" W.C.
13.5" W.C.
Temperature controlled continuous flow gas hot water system.
With or without remote controls, mounted in kitchen, bathroom, etc.
Direct Vent - Forced Combustion
Natural Gas or Propane - Ensure unit matches gas type it's being installed on.
Gas Supply: 3/4" MNPT, Cold Water Inlet: 3/4" MNPT, Hot Water Outlet: 3/4" MNPT
Direct Electronic Ignition
Appliance: AC 120 Volts, 60Hz. Remote Control: DC 12 Volts (Digital)
Simulation Feedforward and Feedback.
Minimum Water Pressure: 15 PSI (Recommended 30-80 PSI for maximum performance)
150 PSI
Non-Polarized Two Core Cable
Flame Failure - Flame Rod
Boiling Protection - 210°F
207°F Bi-Metal Switch Over Heat Temperature Protection
Thermal Fuse 264°F
Automatic Frost Protection - Bi-Metal Sensor & Anti-Frost Heaters
Combustion Fan RPM Check - Integrated Circuit
Over Current - Glass Fuse (3 amp)
Rinnai is continually updating and improving products, therefore, specifications are
subject to change without prior notice. Local, state, provincial and federal codes must
be adhered to prior to installation.
Unless otherwise indicated model designations include both non-ASME and ASME models

4
Rinnai Corporation V3237 Models
LIMITED WARRANTY
Rinnai Water Heater
WHAT IS COVERED?
This Warranty covers any defects in materials or workmanship when the product is installed and
operated according to Rinnai written installation instructions, subject to the terms within this limited
warranty document. This Warranty applies only to products that are installed by a state qualified
or licensed contractor. Improper installation may void this Warranty. Rinnai strongly suggests
that you use an installer who has attended a Rinnai product knowledge class before installing
this water heater. This Warranty extends to the original purchaser and subsequent owners, but
only while the product remains at the site of the original installation. This Warranty only extends
through the first installation of the product and terminates if the product is moved or reinstalled at
a new location.
HOW LONG DOES COVERAGE LAST?
*Important
Period of coverage is 3 years from date of purchase when used as a circulating water heater
within a hot water circulation loop, when the water heater is in series with a circulation system and
all circulating water flows through the water heater.
WHAT WILL RINNAI DO?
Rinnai will repair or replace the product or any part or component that is defective in materials
or workmanship, except as set forth below: Rinnai will pay reasonable labor and shipping costs
to repair the product. All repairs must be performed using genuine Rinnai parts. All repairs or
replacements must be performed by an individual or servicing company that is state qualified or
licensed to do this type of repair.
Replacement of the product or replacement of the heat exchanger may be authorized by Rinnai
only. Rinnai does not authorize any person or company to assume for it any obligation or liability
in connection with the replacement of a product or heat exchanger. If Rinnai determines that
repair of a product is not possible, Rinnai will replace the product with a comparable product, at
Rinnai’s discretion. If a component or product returned to Rinnai is found to be free of defects in
material or workmanship, or damaged by improper installation or damaged during return shipping,
the warranty claim for product, parts and labor may be denied.
Warranty121205COMM-V2
Period of Coverage
Item Commercial Residential
Heat Exchanger 5 Years * 10 Years *
All other Parts and
Components 5 Years * 5 Years *
Reasonable Labor 1 Year
U273-430(00).indd 4 06.2.8 10:36:40 AM

5
Rinnai Corporation V3237 Models
LIMITED WARRANTY
Rinnai Water Heater
HOW DO I GET SERVICE?
Simply contact a qualified Service Dealer or Installer for the repair of products under this Warranty.
Failure to use a qualified Service Dealer or Installer to provide repair service may void the
Warranty. For the name of the qualified Service Dealer or Installer nearest you, please contact
the company that installed the water heater, or;
• Your local HVAC/plumbing dealer, gas service technician or place of purchase
• Visit the Rinnai website www.rinnai.us
• Call Rinnai at 1-800-621-9419 or write to Rinnai, 103 International Drive, Peachtree City, Georgia
30269
Proof of purchase is required to obtain warranty service. You can show proof of purchase with a
dated sales receipt, by completing and mailing the enclosed Warranty registration card within 30
days of purchasing the product or by registering online at www.rinnai.us . Please complete the
Warranty registration either online or mail it to Rinnai at the address shown on the card.
Receipt of warranty registration by Rinnai will constitute proof-of-purchase for this product.
However, Warranty registration is not necessary in order to validate this Warranty.
WHAT IS NOT COVERED?
This Warranty does not cover any failures or operating difficulties due to accident, abuse, misuse,
alteration, misapplication, acts of God, improper installation, improper maintenance or service,
inadequate water quality, scale buildup, freeze damage or for any other causes other than defects
in materials or workmanship. This warranty does not apply to any product whose serial number or
manufacture date has been defaced. This Warranty does not cover any product when used as a
pool or spa heater. (See Water Quality in Care & Lime Section.)
Rinnai is not liable for any special, incidental, indirect or consequential damages that may arise,
including damage to person or property, loss of use, failure to install drain pan under unit, or
inconvenience. Some states do not allow the exclusion or limitation of incidental or consequential
damages, so the above limitation may not apply to you.
LIMITATION ON IMPLIED WARRANTIES
Any implied warranties of merchantability and fitness arising under state law are limited in duration
to the period of coverage provided by this limited Warranty, unless the period provided by state law
is less. Some states do not allow limitations on how long an implied Warranty lasts, so the above
limitation may not apply to you.
This Warranty gives you specific legal rights, and you may also have other rights which vary from
state to state.
Warranty121205COMM-V2
U273-430(00).indd 5 06.2.8 10:36:40 AM

6
Rinnai Corporation V3237 Models
OWNER’S INSTALLATION INFORMATION
All Rinnai water heater(s) SHOULD be installed by a state qualified or
licensed contractor. Failure to comply with state and local codes
pertaining to water heater installation may void the warranty on your
new water heater(s). It is the responsibility of the person having the
water heater installed to ensure the installer has proper licences and
permits for installing water heater(s) in your location. In addition to
licensing and permits, Rinnai encourages all installing contractors to
attend a product knowledge class before installing any of our water
heaters to help insure maximum customer satisfaction and maximum
warranty coverage.
This appliance must be installed in accordance with local codes, or in the
absence of local codes, the National Fuel Gas Code, ANSI Z223.1/NFPA 54
and/or the CSA B149.1, Natural Gas and Propane Installation Code.
FOR INDOOR UNITS: These models have the “FFU” designation
ONLY Install this product indoors, DO NOT install outdoors.
FOR OUTDOOR UNITS: These models have the “W” designation
ONLY Install this product outdoors, DO NOT install indoors.
Do Not use this appliance if any part has been underwater.
Immediately call a qualified service technician to inspect the appliance
and to replace any part of the control system and any gas control
which has been underwater.
Detailed instructions on the proper installation practices to follow for
the installation of your new hot water heater are included at the back
of this manual.
These models have been built in accordance with
the requirements of the ASME Boiler and Pressure
Vessel Code and have received the Certificate of
Authorization from the National Board. The heat
exchangers on these units have the NB and the
HLW stamps.
REU-V3237FFU-ASME
REU-V3237FFUC-ASME
REU-V3237W-ASME
REU-V3237WC-ASME

7
Rinnai Corporation V3237 Models
F E A T U R E S O F Y O U R N E W WATER HEATER
F The Rinnai is one of the most advanced water heaters available. It supplies hot water
continuously at the temperature preset in the unit or at the temperature set on the
optional remote controller(s). Installation of remote controllers are recommended for
optimum functionality.
F The Rinnai never runs out of hot water, while electricity, water and gas supplies are
connected. The Rinnai produces hot water whenever the hot water tap is open.
F The gas burner lights automatically when the hot water tap is opened and shuts off when
the tap is closed. Ignition is electronic, there is no pilot light. When the hot water tap is
off, no gas is used, you save energy and money with the Rinnai.
F The temperature of the outgoing hot water is constantly monitored by a built in sensor.
If the temperature of the outgoing water rises to more than 6OF above the selected
temperature (shown on the digital remote controller) the gas burner automatically shuts
off. The gas burner will re-ignite once the outgoing hot water temperature falls below the
selected temperature.
F Built into the microprocessor of the Rinnai is the ability to LIMIT THE MAXIMUM
TEMPERATURE of the hot water supplied by the Rinnai Water Heaters. Without the
connection of a remote controller(s), the Rinnai Water Heater is preset to deliver water at
120OF (Residential) and 140OF (Commercial).
F Residential Unit: With the remote controller(s) the water temperature is adjustable from
98OF to 140OF. The water temperature cannot be set to a temperature other than
120OF without the use of a remote controller unit.
F Commercial Unit: With the remote controller the water temperature is adjustable up to
185OF. The water temperature cannot be set to a temperature other than 140OF
without the use of a remote controller unit.
F Error messages are displayed on the remote controllers, simplifying service calls.
F The Rinnai Water Heater is a very compact device, saving valuable floor and wall space.
F The Rinnai Water Heater incorporates a device to minimize temperature fluctuations
(cold water sandwich effect) when the water is shut off, then turned on again. This effect
can be eliminated by installing Rinnai Water Heaters with a circulation loop and a small
storage tank.
U273-430(00).indd 7 06.2.8 10:36:41 AM

8
Rinnai Corporation V3237 Models
SAFETY CONSIDERATIONS
Do not clean Remote Controller(s) with
solvents. Use a soft damp cloth.
The water temperature can only be adjusted
between 98°F and 110°F when the hot water
tap is open, and hot water is flowing.
Always check water temperature by hand
before entering the shower or bath. The
temperature may have been changed.
Depending on the weather conditions and
the length of the pipe between the Rinnai
Water Heater and the tap in use, there may
be a variation between the temperatures
displayed at the Remote Controller(s) and the
temperature of the water at the tap.
The Rinnai Water Heater controls the water
temperature automatically. To do this, it
sometimes needs to change the water flow
accordingly. The water flow from the hot water
tap may vary after the selected temperature at
the remote controller(s) is altered. The water
flow may also vary from summer to winter, as
incoming water temperatures differ.
The vent/air intake should be positioned away
from flammable materials, trees, shrubs, etc.
Do not connect the vent to natural draft vents
or fireplaces, the indoor unit can only be used
with an approved vent kit and components.
Do not vent unit into other rooms. The Vent
termination must be located outside.
Summer 60°F
Incoming water
Winter 40°F
Incoming water
U273-430(00).indd 8 06.2.8 10:36:41 AM

9
Rinnai Corporation V3237 Models
To operate the Rinnai Water Heater
simply turn any hot water tap on.
This will automatically light the burner
providing hot water at the preset
temperature. If the optional remote
controller(s) have been installed, the
“IN USE” indicator will glow on all
remote controller(s).
1
To take control of the Rinnai Water Heater,
all hot water taps must be closed. Press
the "Priority” button on the Controller you
want to set the temperature with, and
the "Priority" indicator light will glow. This
Adjusting Temperature
The outlet water temperature of the Rinnai
Water Heater can only be adjusted using the
remote controller(s). To adjust the setpoint
temperature of the Rinnai Water Heater
above the 110 °F, all hot water taps must
be closed, and all circulating pumps turned
off (where applicable). The temperature
displayed on this remote controller will
also be displayed on all other Remote
Controller(s).
3 Simply press the or button
until the desired temperature is
displayed on the Digital Monitor.
4
2
indicates that the Rinnai Water Heater
is ready to supply hot water at the set
temperature as soon as a tap is opened.
Note: The Rinnai water heater will not
provide hot water instantly at the hot water
fixtures. Any cold water existing in the hot
water lines must be purged first.
BASIC OPERATION
TEMPERATURE CAN ONLY BE ADJUSTED
BETWEEN 98°F AND 110°F WHEN ANY
HOT WATER TAP IS OPEN.
Check water temperature
before entering shower or
bath.
There is a hot water scald potential
if the thermostat is set to high.
CHECK LOCAL CODES FOR THE
MAXIMUM WATER TEMPERATURE
SETTING ALLOWED WHEN USED IN
NURSING HOMES, SCHOOL, DAY CARE
CENTERS AND ALL OTHER PUBLIC
APPLICATIONS.
U273-430(00).indd 9 06.2.8 10:36:42 AM

10
Rinnai Corporation V3237 Models
GENERAL CONTROLLER INFORMATION
The controller(s) for the Rinnai water heaters allow the customer to control the functions of the
water heater and to diagnose certain fault conditions.
REMOTE CONTROLLERS IDENTIFICATION
MC-91-1US (comes with the unit)
MC-100V-1US (optional)
BC-100V-1US (optional)
U273-430(00).indd 10 06.2.8 10:36:43 AM

11
Rinnai Corporation V3237 Models
Diagnostic Use of Controller
1. To Display Maintenance Codes: Press the ‘On/Off’ button once to turn the controller off.
Press and hold the ‘On/Off’ button followed by thermostat button to cycle through the
maintenance codes.
2. To Display Water Flow through the water heater: Press the thermostat button and
hold for 2 seconds and then press the ‘On/Off’ button while continuing to hold the
thermostat button.
3. To Display Outlet Water Temperature: Press the thermostat button and hold for 2
seconds and then press the ‘On/Off’ button while continuing to hold the thermostat
button.
To Change the Temperature Display from °F to °C (or °C to °F)
1. Press the ‘On/Off’ button once to turn the controller unit off. With the controller off
press and hold the ‘On/Off’ button until the display changes to °C (°F), approximately 5
seconds.
To Turn Off the Sound (Mute)
1. To turn the sound off (mute) press and hold both the and thermostat buttons until
an audible “beep” is heard, approximately 5 seconds.
Digital Display
Indicates the selected water
temperature. Error messages
flash in the event of a failure.
Thermostat
Increases or decreases
the desired water
temperature.
In Use Indicator
Indicates that the hot water
heater is in operation.
ON/OFF Button
Used to switch the
water heater on and off.
Priority Button
Pressing takes control of the
water temperature by this
controller only when all taps
are off.
Priority Indicator
Indicates whether this
controller has priority
control over the water
temperature
REMOTE CONTROLLER OPERATION
U273-430(00).indd 11 06.2.8 10:36:44 AM

12
Rinnai Corporation V3237 Models
DELUXE CONTROLLER
ABOUT THE DELUXE CONTROLLER (MC-100V-1US)
ABOUT THE DELUXE BATHROOM CONTROLLER (BC-100V-1US)
DELUXE BATHROOM CONTROLLER
With power interruption, water heater will automatically default to the ON position to
provide hot water.
Digital Display
Indicates the selected water
temperature. Error messages flash
in the event of a failure.
ON/OFF
Used to switch the water heater on
and off.
Priority
Pressing takes control of the water
temperature by this controller only
when all taps are off.
Function
Enables the user to set the clock
and sound volume functions.
Thermostat
Increases or decreases the desired
water temperature.
In Use Indicator
Indicates that the hot water heater is
in operation.
Water Temperature Indicator
Indicates the selected hot water
temperature.
Clock
12 Hour AM / PM clock. In the event
of a fault, codes for error messages
will flash here.
Call
Allows user to contact another
controller. Can be used as a
communication channel for errands
or in emergency situations.
In Use Indicator
Indicates that the hot water heater is in operation.
Priority
Pressing takes control of the water
temperature by this controller only
when all taps are off.
Call
Allows user to contact another
controller. Can be used as a
communication channel for errands
or in emergency situations.
Clock
12 Hour AM / PM clock. In the event
of a fault, codes for error messages
will flash here.
Thermostat
Increases or decreases the desired
water temperature.
Sound Volume
Used to select the voice prompt
volume.
Water Smart / Bath Fill Indicator
Used to select Water Smart / Bath Fill Function.
ON/OFF
Used to switch the water heater on
and off.
Water Smart / Bath Fill
Used to select Water Smart / Bath
Fill Function.
Power Save
Indicates that the remote is in the
energy saving mode.
Water Volume
Used to select Water Smart / Bath
Fill volumes.
U273-430(00).indd 12 06.2.8 10:36:45 AM

13
Rinnai Corporation V3237 Models
DELUXE CONTROLLER
Setting The Sound Volume
Press the “Function” Button, the default voice prompt sound volume is set at medium. Each
subsequent press of the and Button will cycle through the available volume settings in
the following order: High Voice - Off Voice (beep) - Off Sound (no beep) - Low Voice - Medium
Voice.
Setting The Clock (MC-100V Deluxe Controller ONLY)
The clock is a 12 hour AM/PM style display. To set the time, press the “Function” Button twice
within 10 seconds. Press the and Buttons to adjust the time. When you get close to
the time you wish to set, press the button intermittently to avoid going further than the desired
time.
Press the ‘Function’ Button again to complete setting the clock and return to normal operation.
Adjusting Temperature
Simply press the and buttons until the desired temperature is displayed on the Digital
Display.
To operate the hot water unit, open any hot water tap. This will automatically light the burner
providing hot water. The “In Use” Indicator will illuminate on the Temperature Controller.
Once the hot water heater is in operation, if the set temperature is either too hot or cold, press
the or buttons until the desired temperature is reached.
TEMPERATURE CAN ONLY BE ADJUSTED
BETWEEN 98°F AND 110°F WHEN ANY
HOT WATER TAP IS OPEN.
U273-430(00).indd 13 06.2.8 10:36:46 AM

14
Rinnai Corporation V3237 Models
DELUXE BATHROOM CONTROLLER
Setting the Sound Volume
The voice prompt sound volume for all Deluxe
Controllers can be set individually. Press
the “Sound Vol.” button. The default voice
prompt sound volume is set at medium. Each
subsequent press of the “Sound Vol.” will cycle
through the available volume settings in the
following order: High Voice - Off Voice (beep)
- Off Sound (no beep) - Low Voice - Medium
Voice.
Adjusting Temperature
Simply press the “Hot water temp.” or
buttons until the desired temperature is
displayed on the Digital Display.
To Operate the product, open any hot water
tap. This will automatically light the burner
providing hot water. The “In Use” Indicator
will illuminate on the Temperature Controller.
Once the hot water is running, if the set
temperature is either too hot or cold, press the
“Hot water temp.” or buttons until the
desired temperature is reached. TEMPERATURE CAN ONLY BE ADJUSTED
BETWEEN 98°F AND 110°F WHEN ANY
HOT WATER TAP IS OPEN.
Avoid getting water in the Controller(s) speaker as this may cause damage.
A responsible adult should always check the water temperature before a child or
infirm person is place in contact with hot water.
U273-430(00).indd 14 06.2.8 10:36:47 AM

15
Rinnai Corporation V3237 Models
OPERATING THE WATER SMART / BATH FILL FUNCTION
The “Water Smart / Bath Fill” function allows a preset water volume and
temperature to be selected and run automatically.
Initial Settings
When you press the ‘Water Smart / Bath Fill” Button, a Shower / Bath
Water Volume will appear on the indicator. When a deluxe bathroom
controller(s) is first turned on, the default shower / bath fill water volume
is set to 25 gallons. The shower / bath water volume can be lowered to
a minimum of 10 gallons or raised to a maximum of 120 gallons.
Programming Shower / Bath Volume and Temperature
With the system on, select a Deluxe Bathroom controller(s) and ensure that it currently has
priority. If it does not have priority, press the ‘Priority’ button once. The “Priority” button will
illuminate.
To select the desired delivery temperature, use the
“Temp.” or buttons.
The selected temperature will be displayed on the
bathroom controller monitor and will remain as the
default temperature until it is changed.
To select the volume of water to be used by the
shower / bath, use the “Water Vol.” or buttons.
The selected water volume is numerically displayed at
the right of the controller monitor.
When filling a bath for the first time, it is recommended
that a low bath fill water volume such as 25 gallons
or lower (if available) be used. During any subsequent
bath fills, the volume can then be adjusted to suit your
known bath water volume and / or desired fill level.
DELUXE BATHROOM CONTROLLER
IT IS THE CUSTOMERS RESPONSIBILITY TO MONITOR THE BATH FILL
REMOTE CONTROLLER FUNCTIONS.
Be careful not to overfill the bath. It is recommended that when filling a bath for the
first time you should:
• Remain by the bath during the filling process.
• Use a low bath fill volume such as 25 gallons or less.
The “Water Smart / Bath Fill” function is unavailable with the MSA Controller System.
U273-430(00).indd 15 06.2.8 10:36:49 AM

16
Rinnai Corporation V3237 Models
DELUXE BATHROOM CONTROLLER
Using Water Smart / Bath Fill
Press “Water Smart / Bath Fill” button once. The “Water Smart / Bath
Fill” button will illuminate and a tone will sound. The “Bath” indicator
will also be displayed in the Kitchen Controller Monitor (Deluxe
Models ONLY).
The voice prompt will say “The hot water system is ready. Open the
hot water tap”.
Open the hot water tap for the relevant shower or bath.
The “In Use” indicator will illuminate at all Deluxe Temperature
Controller(s) and the shower will run or the bath will start to fill.
To Stop Water Smart / Bath Fill Operation
If you wish to stop the water flow after the “Water Smart / Bath Fill”
function is selected, simply press the “Water Smart / Bath Fill” button.
The “Water Smart / Bath Fill” button will flash and the voice prompt
will say “Hot water is not available, turn off all hot water taps and
push the Bath Fill button”. Follow the voice prompt instructions.
When Water Smart / Bath Fill Operations Finishes
Once the “Water Smart / Bath Fill” operation finishes, the following
events will occur:
1. The flow from the shower / bath hot water tap will cease.
2. The “Water Smart / Bath Fill” button will flash.
3. The Kitchen Controller ‘Bath’ indicator will flash (Deluxe Models)
4. A tone will sound.
5. The voice prompt will say “Bath fill is complete. Turn off the
bath hot water tap and push the “Bath Fill” button.
Follow the voice prompts instructions. Note that the
hot water unit will not allow hot water to flow from any
fixture until the ‘Water Smart / Bath Fill’ button has
been changed.
6. The “Water Smart / Bath Fill” Button light on
the Bathroom Controller and the “Bath” indicator
on the Kitchen Controller monitor will go out.
COMBINING CONTROLLERS AND DELUXE CONTROLLERS
Controller and Deluxe Controller can be combined and will function as described in other
sections of this manual. Refer to the Temperature Table page to confirm the maximum
number and combination of controllers that can be fitted to all water heater models. When
using two Deluxe controllers, only one Controller MC-100V-1US can be installed.
HOTHOT
COLD
ON!OFF! COLD
U273-430(00).indd 16 06.2.8 10:36:50 AM

17
Rinnai Corporation V3237 Models
CONTROLLERS SET PATTERN/TEMPERATURE TABLES
Temperature Controllers allows precise temperature control by the user. When used correctly,
the hot water unit will deliver the selected temperature, even when the water flow is varied,
or more than one tap is in use. Each Temperature Controller can be individually programmed,
however, the water heater unit can only deliver one set temperature at any time. The available
temperatures (OF) are as follows:
Suggested temperatures are:
Kitchen 120OF, Shower 98OF, Bath fill 102OF
These temperatures are suggestions only. You may find higher or lower temperatures more comfort-
able. Maintaining lower temperatures helps save energy. To obtain water temperatures lower than
98OF, simply add cold water.
Deluxe Controllers are an optional extra. Controllers and Deluxe Controllers can be installed together.
Controllers allow temperature selection only. Deluxe Controllers have temperature selection, bath fill
and clock functions.
Controllers allow the water temperature to be set from the various locations where they are
installed. The temperature selected will be available to all outlets. Below are the combination of
Controllers that are offered by Rinnai:
**See controller manual in controller carton box for more detailed information.
Temperature Table by Models
Controllers Combination Pattern
Water Smart / Bath Fill Temperature Table
Water Smart / Bath Fill temperature
Cannot exceed 120°F.
U273-430(00).indd 17 06.2.8 10:36:51 AM

18
Rinnai Corporation V3237 Models
The Rinnai Water Heater has the ability to check its own operation continuously. If a fault
occurs, an Error Message will flash on the Digital Dispaly of the Remote Controller. This assists
with diagnosing the fault, and may enable you to overcome a problem without a service call.
Please identify the code displayed when inquiring about service.
ERROR MESSAGES
Failure to remedy faults may result in severe burns, scalds, and/or death.
Error
02
03
10
11
12
Faulty
No burner operation during
freeze protection mode
Power interruption during
Bath fill (Water will not flow
when power returns).
Air Supply or Exhaust
Blockage
No Ignition
Flame Failure
Remedy
Service Call
Turn off all hot water taps. Press ON/OFF twice.
Ensure Rinnai approved venting materials are being used.
Check that nothing is blocking the flue inlet or exhaust.
Check all vent components for proper connections.
Ensure vent length is within limits.
Ensure condensation collar was installed correctly.
Verify dip switches are set properly.
Check fan for blockage.
Check that the gas is turned on at the water heater, gas meter, or cylinder.
Ensure gas type and pressure is correct.
Ensure gas line, meter, and/or regulator is sized properly.
Bleed all air from gas lines.
Verify dip switches are set properly.
Ensure appliance is properly grounded.
Disconnect all MSA controls.
Ensure igniter is operational.
Check igniter wiring harness for damage.
Check gas solenoid valves for open or short circuits.
Remove burner cover and ensure all burners are properly seated.
Remove burner plate and inspect burner surface for condensation or debris.
Check that the gas is turned on at the water heater and gas meter. Check for obstructions in the flue
outlet.
Ensure gas line, meter, and/or regulator is sized properly.
Ensure gas type and pressure is correct.
Bleed all air from gas lines.
Ensure proper Rinnai venting material was installed.
Ensure condensation collar was installed properly.
Ensure vent length is within limits.
Verify dip switches are set properly.
Ensure appliance is properly grounded.
Disconnect keypad.
Disconnect all MSA controls if installed.
Check power supply for loose connections.
Check power supply for proper voltage and voltage drops.
Ensure flame rod wire is connected.
Check flame rod for carbon build-up.
Disconnect and re-connect all wiring harnesses on unit and PC board.
Check all components for electrical short.
Check gas solenoid valves for open or short circuits.
Remove burner plate and inspect burner surface for condensation or debris.
U273-430(00).indd 18 06.2.8 10:36:52 AM

19
Rinnai Corporation V3237 Models
ERROR MESSAGES
Error
14
16
32
33
34
52
61
65
71
72
LC
(00)
No
code
Faulty
Thermal Fuse
Over Temperature Warning
Outgoing Water
Temperature Sensor Fault
Heat Exchanger Outgoing
Temperature Sensor Fault
Combustion Air Temperature
Sensor Fault
Modulating Solenoid Valve
Signal Abnormal
Combustion Fan Failure
Water Flow Servo Faulty
(Does not stop flow properly)
SV0, SV1, SV2, and SV3
Solenoid Valve Circuit Fault
Flame Sensing Device Fault
Scale Build-up in Heat
Exchanger (when checking
maintenance code history
“00” is substituted for “LC” )
Nothing happens when
water flow is activated.
Remedy
Check gas type of unit and ensure it matches gas type being used.
Check for restrictions in air flow around unit and vent terminal.
Check for low water flow in a circulating system causing short-cycling.
Ensure dip switches are set to the proper position.
Check for foreign materials in combustion chamber and/or exhaust piping.
Check heat exchanger for cracks and/or separations.
Check heat exchanger surface for hot spots which indicate blockage due to scale build up. Refer to
instructions in manual for flushing heat exchanger.
Measure resistance of safety circuit.
Ensure high fire and low fire manifold pressure is correct.
Check for improper conversion of product.
Check for restrictions in air flow around unit and vent terminal.
Check for low water flow in a circulating system causing short-cycling.
Check for foreign materials in combustion chamber and/or exhaust piping.
Check for clogged heat exchanger.
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build up.
Replace sensor.
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build up.
Replace sensor.
Check for restrictions in air flow around unit and vent terminal.
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build up.
Ensure fan blade is tight on motor shaft and is in good condition.
Replace sensor.
Check modulating gas solenoid valve wiring harness for loose or damage terminals.
Measure resistance of valve coil.
Ensure fan will turn freely.
Check wiring harness to motor for damaged and/or loose connections.
Measure resistance of motor winding.
Water Flow Servo or wiring faulty. Check Water Flow Servo wiring harness connection.
Measure resistance of Water Flow Servo wiring.
If blank screen is present on remote control then the Water Flow Servo has shorted out. Unplug Water
Flow Servo. If remote lights up and unit starts operating then replace Water Flow Servo.
Check wiring harness to all solenoids for damage and/or loose connections.
Measure resistance of each solenoid valve coil.
Ensure flame rod is touching flame when unit fires.
Check all wiring to flame rod for damage.
Remove flame rod and check for carbon build-up; clean with sand paper.
Check inside burner chamber for any foreign material blocking flame at flame rod.
Measure micro amp output of sensor circuit with flame present.
Replace flame rod.
Flush heat exchanger. Refer to instructions in manual.
Replace heat exchanger.
Clean inlet water supply filter.
On new installations ensure hot and cold water lines are not reversed.
Check for bleed over. Isolate unit from building by turning off hot water line to building. Isolate the
circulating system if present. Open your pressure relief valve; if unit fires, there is bleed over in your
plumbing.
Ensure you have at least the minimum flow rate required to fire unit.
Ensure turbine spins freely.
Measure the resistance of the water flow control sensor.
Remote control does not light up but you have 12 VDC at the terminals for controls.
U273-430(00).indd 19 06.2.8 10:36:52 AM

20
Rinnai Corporation V3237 Models
MAINTENANCE SUGGESTIONS
This water heater has been designed and constructed
for a long performance life when installed and operated
properly under normal conditions. Regular inspections,
as outlined in this section, are strongly recommended
as a means of keeping your heater operating efficiently.
Consideration should be given to periodic maintenance
of scale removal in applications where the water
hardness quality is elevated and the water heater
runs for extended periods such as in commercial
applications or applications with circulating loops.
1. Cleaning
The water heater should be cleaned annually.
Keep the water heater clear of dust and debris
especially in and around burner.
Cleaning procedures for the Rinnai are as follows:
1) Turn off and disconnect electrical power. Allow
to cool for one hour.
2) Remove the Front Panel by removing screws.
See parts breakdown on panels.
3) Use pressurized air to remove dust from around
main burner.
4) Use soft dry cloth to wipe cabinet.
DO NOT DAMAGE OR DISTORT ANY PARTS OF
HEATER.
DO NOT USE WET CLOTH OR SPRAY CLEANERS
ON BURNER.
2. Visual check of main burner flames.
The burner must flame evenly over the entire
surface when operating correctly. The flame must
burn with a clear, blue, stable flame. See the parts
breakdown of the burner for the location of view
ports. Any and all parts removed for inspection or
service must be replaced before operating the unit.
The flame pattern should be as shown in the
following Figures.
* VENT MAINTENANCE
* VENT SYSTEM
Must be checked annually for
blockage or deterioration. See
vent installation instructions.
* MAINTENANCE-
ELECTRIC MOTORS
Motors are permanently
lubricated and need no
lubrication. Keep fan and motor
free of dust and dirt, clean
annually.
MAINTENANCE & SERVICE INFORMATION
U273-430(00).indd 20 06.2.8 10:36:52 AM