American Water Heater HCG-60T120 How to use

1
PRINTED 0508 198153-000
COMMERCIAL GAS WATER HEATERS
FOR MODELS:
 • HCG-60T120
 • AHCG-60T120
 • HCG-100T150
 • AHCG-100T150
 • HCG-100T199
 • AHCG-100T199
 • HCG-100T250
 • AHCG-100T250
SERVICE HANDBOOK
HIGH EFFICIENCY
COMMERCIAL GAS SERIES

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 1 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
INTRODUCTION......................................................................................................................................................................2
QUALIFICATIONS....................................................................................................................................................................2
TOOLS REQUIRED.................................................................................................................................................................3
GENERAL INFORMATION......................................................................................................................................................4
GAS PRESSURE REQUIREMENTS ......................................................................................................................................4
GAS PRESSURES – 120 and 150 KBtu/hr MODELS.............................................................................................................5
GAS VALVE 120 KBtu/hr MODEL............................................................................................................................................6
GAS VALVE 150 KBtu/hr MODEL............................................................................................................................................6
GAS PRESSURES 199 and 250 KBtu/hr MODELS.................................................................................................................7
GAS VALVE 199 and 250 KBtu/hr MODELS...........................................................................................................................8
VENTING TABLES...................................................................................................................................................................9
VENTING - ALL MODELS – SINGLE PIPE POWER VENT – USING ROOM AIR................................................................10
VENTING – ALL MODELS – TWO PIPE DIRECT VENT – USING OUTSIDE AIR...............................................................11
VENT / INTAKE AIR TERMINATIONS...................................................................................................................................12
DIRECT VENT INSTALLATIONS...........................................................................................................................................13
CONTROL OVERVIEW .........................................................................................................................................................14
ADJUSTING TANK TEMPERATURE – OPERATING SET POINT - DIFFERENTIAL..........................................................15
CHANGING THE DISPLAY UNITS........................................................................................................................................16
FAULT AND WARNING CONDITIONS – ADVANCED DIAGNOSTIC INFORMATION........................................................17
CURRENT FAULT OR WARNING.........................................................................................................................................18
VIEWING THE FAULT HISTORY – WATER HEATER INFORMATION................................................................................19
SEQUENCE OF OPERATION - TEXT...................................................................................................................................20
SEQUENCE OF OPERATION – FLOW CHART...................................................................................................................21
CONTROLS – CENTRAL CONTROL BOARD – CCB ..........................................................................................................22
CONTROLS – PRESSURE SWITCHES................................................................................................................................23
CONTROLS – PRESSURE SWITCHES (cont)......................................................................................................................24
CONTROLS – IGNITER, FLAME SENSOR, SIGHT GLASS, POWERED ANODES............................................................25
MINIMUM IGNITER / FLAME SENSOR CURRENT - CONTROL TIMING............................................................................26
BLOWER SPEED CONTROL 199 AND 250 KBtu/hr MODELS............................................................................................27
WIRING DIAGRAM................................................................................................................................................................28
TABLE OF CONTENTS

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 2 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
INTRODUCTION
QUALIFICATIONS
ANSI Z223.1 Sec 3.3.83
"Qualified Agency"
"Any individual, firm, corporation or company
that either in person or through a
representative is engaged in and is
responsible for (a) the installation, testing or
replacement of gas piping or (b) the
connection, installation, testing, repair or
servicing of appliances and equipment; that
is experienced in such work; that is familiar
with all precautions required; and that has
complied with all the requirements of the
authority having jurisdiction."
Service of this water heater requires ability
equivalent to that of a Qualified Service
Agent (licensed tradesman) in the field
involved. Installation skills such as plumbing,
air supply, venting, gas supply, electrical
supply are required in addition to electrical
testing skills. Some products may require
combustion testing equipment and
certification. If you do not possess these
skills or do not have the proper tools you
should not attempt to service this water
heater.
The service manual is designed to aid in
servicing and troubleshooting High-Efficiency
Commercial Gas Series water heaters in the
field. Duplication or reproduction of this
manual is forbidden without the express
written authorization from the manufacturer.
The following text and illustrations will
provide you with a step by step procedure to
verify proper installation, operation, and
troubleshooting procedures. Additional quick
reference data is included to assist you in
servicing these products.
The information contained in this manual is
designed to answer commonly faced
situations encountered in the operation of
this product line and is not meant to be all
inclusive. If you are experiencing a problem
not covered in this manual, please contact
the manufacturer via information listed in the
instruction manual that came with the water
heater and/or the labeling on the water
heater.
This manual does not replace or supersede
the Instruction Manual that came with the
water heater. Always refer to the Instruction
Manual that came with the water heater for
complete installation instructions.

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 3 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
TOOLS REQUIRED
●ELECTRICAL MULTIMETER CAPABLE OF MEASURING CONTINUITY/ OHMS, AC
& DC VOLTS, AMPERES, MICROAMPERES, MILLIVOLTS, and FREQUENCY(Hz)
○UEi Model DL289 or equivalent
●DIGITAL MANOMETER + 60” W. C. in .01” increments
Note: A digital manometer is required for testing pressure switches and can replace
a gas pressure gauge, draft gauge or slack tube manometer for checking gas
pressure.
○UEi model EM200, TPI model 620 or equivalent
●WATER PRESSURE GAUGE w/ LAZY HAND AND HOSE BIBB CONNECTION
●THERMOMETER
●1-1/16 INCH SOCKET WITH EXTENSION FOR ANODE REPLACEMENT
●SET OF NUMBERED DRILL BITS
DIGITAL MANOMETER
WATER PRESSURE
TEST GAUGE W/ LAZY
HAND AND HOSE BIBB
CONNECTION
DIGITAL MULTIMETER

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 4 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
GENERAL INFORMATION
GAS PRESSURE REQUIREMENTS
INSTALLATION REQUIREMENTS FOR THE
COMMONWEALTH OF MASSACHUSETTS
For all side wall terminated, horizontally vented
power vent, direct vent, and power direct vent gas
fueled water heaters installed in every dwelling,
building or structure used in whole or in part for
residential purposes, including those owned or
operated by the Commonwealth and where the side
wall exhaust vent termination is less than seven (7)
feet above finished grade in the area of the venting,
including but not limited to decks and porches, the
following requirements shall be satisfied:
INSTALLATION OF CARBON MONOXIDE
DETECTORS
At the time of installation of the side wall horizontal
vented gas fueled equipment, the installing plumber
or gas fitter shall observe that a hard wired carbon
monoxide detector with an alarm and battery back-
up is installed on the floor level where the gas
equipment is to be installed. In addition, the
installing plumber or gas fitter shall observe that a
battery operated or hard wired carbon monoxide
detector with an alarm is installed on each
additional level of the dwelling, building or structure
served by the sidewall horizontal vented gas fueled
equipment. It shall be the responsibility of the
property owner to secure the services of qualified
licensed professionals for the installation of hard
wired carbon monoxide detectors. In the event that
the side wall horizontally vented gas fueled
equipment is installed in a crawl space or an attic,
the hard wired carbon monoxide detector with alarm
and battery back-up may be installed on the next
adjacent floor level. In the event that the
requirements of this subdivision can not be met at
the time of completion of installation, the owner
shall have a period of thirty (30) days to comply with
the above requirements provided that during said
thirty (30) day period, a battery operated carbon
monoxide detector with an alarm shall be installed
APPROVED CARBON MONOXIDE DETECTORS
Each carbon monoxide detector as required in
accordance with the above provisions shall comply
with NFPA 720 and be ANSI/UL 2034 listed and
CSA certified.
SIGNAGE
A metal or plastic identification plate shall be
permanently mounted to the exterior of the building
at a minimum height of eight (8) feet above grade
directly in line with the exhaust vent terminal for the
horizontally vented gas fueled heating appliance or
equipment. The sign shall read, in print size no less
than one-half (1/2”) inch in size,
“GAS VENT DIRECTLY BELOW. KEEP CLEAR
OF ALL OBSTRUCTIONS.”
MODELS Natural
120-150 Propane 120-150 Natural 199-250 Propane 199-250
Maximum Gas Supply Pressure 10.5” WC
(2.59kPa) 14.0“WC ( 3.45kPa) 10.5“WC (2.59kPa) 14.0“WC ( 3.45kPa)
Nominal Gas Supply Pressure 7.0”WC
(1.74kPa) 11.0“WC ( 2.74kPa) 7.0“WC (1.74kPa) 11.0“WC ( 2.74kPa)
Minimum Gas Supply Pressure
(Low Gas Press. Switch
Setting)
4.8”WC
(1.20kPa) 8.5“WC ( 2.12kPa) 4.8”WC (1.20kPa) 8.5“WC ( 2.12kPa)
Manifold Pressure 4.0”WC
(0.98kPa) 10.0“WC (2.49 kPa) 0“WC ( 0 kPa) 0“WC ( 0 kPa)

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 5 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
GAS PRESSURES – 120 and 150 KBtu/hr MODELS
ADJUSTMENT PROCEDURE:
GAS PRESSURE
120 AND 150 MODELS
Verify supply gas pressure is within the
requirements given in the Instruction Manual
that came with the water heater and shown in
the table on page 4 prior to start up.
1.Check gas line pressure with a manometer.
2.Check manifold pressure with a manometer
connected to the manifold pressure tap on the gas
control valve,
If full rate adjustment is required, remove cover screw
from top of the gas control valve. Using a small
screwdriver, turn adjusting screw clockwise to
increase or counterclockwise to decrease gas
pressure to obtain manifold pressures given in the
table on page 4.
3. Cycle the burner on and off several times to check
and check operation.
HIGH ALTITUDE INSTALLATIONS
120 AND 150 MODELS
For appliance installation locations with elevations
above 6,500 feet (1982 meters) consult the “High
Altitude Installation” section of the Instruction Manual
that came with the water heater.
CHECKING THE FIRING RATE
a. Attach a manometer to the manifold pressure tap
on the gas valve – refer to the table on page 4 for
correct pressure.
b. Use this formula to “clock” the meter. Be sure
other gas consuming appliances are not operating
during this interval.
Btuh = 3600 X H/ T
T = Time in seconds to burn 1 cubic foot of gas.
(With a stopwatch read the gas meter and measure
the amount of time required for the heater to consume
1 cubic foot of gas.)
H = Heating value of gas (in Btu’s per cubic foot of
gas).
Btuh = Actual heater input rate, in Btuh.
EXAMPLE: (150 KBtu/hr model)
T = 25.25 seconds
H = 1050 Btu/ft.3
BTUH = ?
Compare result to the de-rated input required for
the elevation at the installation location.
Should it be necessary to adjust the gas pressure to
the burner, to obtain the full input rate, the steps below
should be followed:
c. Remove the pressure regulator cover screw and
adjust the pressure by turning the adjusting screw with
a small screwdriver. Do not exceed 4.0" (1 kPa)
natural gas models and 10.0" w.c. (2.5kPa) on the
propane models. Clockwise to increase gas pressure
and input rate. Counterclockwise to decrease gas
pressure and input rate.
d. “Clock” the meter as in step (b) above.
e. Repeat steps (c) and (d) until the specified input
rate is achieved.
f. Turn the manual gas valve to “OFF”. Replace the
pressure regulator cover screw. Remove the pressure
gauge or manometer from the manifold pressure tap.
Replace the set screw in the manifold pressure tap. If
the gas pressure regulator cannot be adjusted to give
the full input rating with sufficient gas pressure at the
valve, check to ensure the unit is equipped with the
correct orifice.
A supply gas pressure regulator
(service regulator) must be installed on
the gas supply line within 10' (305 cm)
of the unit.

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 6 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
GAS VALVE 120 KBtu/hr MODEL
GAS VALVE 150 KBtu/hr MODEL
The gas control valve on the 150 KBtu/hr
model is has a built in pressure regulator.
The regulator may be adjusted by removing
the cap screw marked “regulator” in the
illustration.
Inlet gas pressure may be read at the inlet
pressure tap only if the manual switch is set
the “ON” position.
The gas control valve on the 120 KBtu/hr
model has a built in adjustable pressure
regulator. The adjustment screw is accessed
by removing the cap screw market regulator
in the illustration.
Inlet gas pressure may be read at the inlet
pressure tap only if the manual shut off valve
(gas cock) is in the “ON” position. Leaving
the knob in the “OFF” position will not allow
the burner to fire and will generate a fault
code on the UIM (Universal Interface
Module).

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 7 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
GAS PRESSURES 199 and 250 KBtu/hr MODELS
ADJUSTMENT PROCEDURE:
GAS PRESSURE
199 AND 250 MODELS
THE 199 AND 250 MODELS
INCORPORATE A NEW GAS CONTROL,
WHICH OPERATES AT A MANIFOLD
PRESSURE OF 0"W.C. (0 kPa) FOR BOTH
NATURAL AND PROPANE GAS. SEE THE
GAS PRESSURE CHART ON PAGE 4.
THESE MODELS ARE FACTORY SET, NO
MANIFOLD GAS PRESSURE
ADJUSTMENTS ARE NECESSARY PRIOR
TO STARTUP.
Verify supply gas pressure is within the
requirements given in the Instruction Manual
that came with the water heater and shown
in the table on page 4 prior to start up.The
inlet gas pressure must not exceed the
maximum values.
HIGH ALTITUDE INSTALLATION
The 199 and 250 models are suitable for
installation up to 10,100 feet above sea level
with no adjustments.
GAS ORIFICE
The 199 and 250 models do not have a
natural gas orifice. A .230” orifice is used on
LP gas models.
A supply gas pressure regulator
(service regulator) must be installed on
the gas supply line within 10' (305 cm)
of the unit.
IMPORTANT NOTE
Gas Control with .230” LP Orifice
Venturi
Gasket w/
LP Gas
Orifice
(.230”
Brass)
Gas Control Without Orifice
Natural Gas
Venturi
Gasket w/
o orifice

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 8 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
GAS VALVE 199 and 250 KBtu/hr MODELS
Pressure readings may be taken on the gas
valve by connecting a manometer to the
pressure ports on the valve. The manifold
pressure on this valve is 0”w.c. (0kPa) when
the water heater is running. Refer to the gas
pressure chart on page 4.
Note: Manometer tubing shown is not
supplied with the water heater.
Manifold
gas
Pressure
0” WC
(0kPa)
Supply
gas
pressure
WARNING: Do not attempt adjustments on
this gas valve. Contact the “help line” listed
on the water heater for assistance.

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 9 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
VENTING TABLES
Maximum equivalent feet of intake air and vent pipe using 3” PVC is 50 feet (15.2m). Equivalent feet
must include any 90° elbows (two 45° elbows equal one 90° elbow). Three inch diameter 90° elbows
are equivalent to 5' (1.5m) of pipe.
Maximum equivalent feet of intake and vent pipe using 4” PVC is 120 feet (36.6m).
Equivalent feet must include any 90° elbows (two 45° elbows equal one 90° elbow). Four inch
diameter 90° elbows are equivalent to 5' (1.5m) of pipe.
Number of 90°
Elbows 3" Minimum Pipe (Ft./M.) 3" Maximum Pipe (Ft./M.) 4"Maximum Pipe (Ft./M.)
ONE (1) 7/2.1 45/13.7 115/35
TWO (2) 7/2.1 40/12.2 110/33.5
THREE (3) 7/2.1 35/10.7 105/32
FOUR (4) 7/2.1 30/9.1 100/30.5
FIVE (5) 7/2.1 --- 95/29
SIX (6) 7/2.1 --- 90/27.4
Vent/Intake Air Pipe Equivalent Feet (Meters)

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 10 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
VENTING - ALL MODELS – SINGLE PIPE POWER VENT – USING ROOM AIR
MINIMUM 18INCHES(46CM)
MINIMUM 18INCHES(46CM)

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 11 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
VENTING – ALL MODELS – TWO PIPE DIRECT VENT – USING OUTSIDE AIR
MINIMUM 18INCHES(46CM)
MINIMUM 18INCHES(46CM)

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 12 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
VENT / INTAKE AIR TERMINATIONS
WHEN LOCATING THE VENT AND INTAKE AIR TERMINATIONS ON A SIDEWALL, THE
FOLLOWING SPECIFICATIONS PERTAINING TO LOCATION AND CLEARANCES MUST BE
FOLLOWED.
1. The intake vent terminal and the exhaust vent terminal must terminate on
the same exterior wall and must be located at a minimum of 24" (61cm)
from the vertical centerline of the exhaust vent terminal (see Figure 9).
In colder climates increasing the 24" (61cm) minimum will reduce
possibility of frost over from side winds blowing exhaust vapors to the
air intake of the direct vent.
2. The horizontal centerline of the intake vent terminal may not be located
lower than the horizontal centerline of the exhaust vent terminal.

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 13 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
DIRECT VENT INSTALLATIONS
The intake air connection on the water heater contains a mesh screen to prevent large particles from
entering the blower. WHEN THE WATER HEATER IS INSTALLED DIRECT VENT (TWO PIPES),
THE BALANCE PLATE AND MESH SCREEN MUST BE REMOVED BEFORE GLUING PIPE TO
THE CONNECTOR.
Terminations and mesh screens are provided. Both terminations will be used in direct vent
installations. The screens are provided to prevent vermin, birds, or large debris from entering
the intake air and exhaust vent piping and should never be removed.
Vent/Intake Air Terminations
120-250
45° PVC Elbow
Remove the balance plate and mesh
screen before gluing intake air pipe
to the fitting.

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 14 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
Interaction with the control system is done through the
User Interface Module (UIM).The default screen is
referred to as the “desktop” or “desktop screen”. Up
and down buttons and three operation buttons allow
navigation of the control system menus and changing
of user settings. The current function of the three
operation buttons is determined by the text displayed
on the UIM immediately above each button.
During normal operation the UIM will display the
desktop screen (if there are no active faults or
warnings).
●An example of this screen is shown below.
●The first temperature on this screen is the
temperature of the water inside the tank.
●The second temperature on this screen is the
Operating Set Point.
●The Operating Set Point is the temperature at
which the water heater will maintain the water
inside the tank.
●The third line on the screen is a text
description of the Operational State of the
water heater. The operating state of the water
heater is also indicated graphically by status
icons.
The table of status icons describes graphically
operational details of the water heater. Below is a
legend of all the status icons:
Status
I
co
nDescription
The temperature of the water in the tank has
fallen and the water heater will now initialize a
new heating cycle.
The temperature of the water in the tank has
reached the Operating Set Point.
The control is unable to initiate any further
heating cycles. This is usually caused by a fault
condition detected by the control, but can also
occur when an external system (like an energy
management system) has asked the water
heater to discontinue any further heat cycles.
The blower is being energized.
The blower pressure switch has been made.
The igniter has been energized.
The igniter has been energized and sufficient
current for ignition has been detected.
The control has requested that the gas valve
be turned on.
The control has sensed flame in the burner.
The control has detected a fault condition. A
fault condition will cause the water heater to
discontinue o
p
eration.
The control has detected a warning condition.
These conditions will not cause the water heater
to discontinue further heating cycles, but does merit
attention.
CONTROL OVERVIEW
^
OPERATION
BUTTONS UP AND
DOWN
BUTTONS

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 15 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
ADJUSTING TANK TEMPERATURE – OPERATING SET POINT - DIFFERENTIAL
The Operating Set Point of this water heater
determines the regulated temperature for the water in
the tank. This parameter is adjusted in the desktop
Temperature menu. Items in this menu allow you to
monitor different temperature readings in the tank
along with adjusting the Operating Set Point and
Differential.
ACTION:
From the desktop screen, press Menu.
DISPLAY:
ACTION:
From the Main Menu, press Select to enter the
"Temperatures" screen.
DISPLAY:
ACTION:
Press Change then use the UP and DOWN buttons to
change the temperature Set Point.
DISPLAY:
Note: This procedure can also be used to change the
Differential. The tank Upper and Lower Temperatures
are not user changeable. They are determined by the
temperature probes on the heater.
ACTION:
Press Update to accept the change or Cancel to reset
it.
DISPLAY:

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 16 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
CHANGING THE DISPLAY UNITS
The desktop menu has the option of selecting
between degrees Fahrenheit and degrees Celsius for
temperature displays. This can be found in the
“Display Settings” menu. Also in this menu, you may
adjust how the back-light operates and the contrast of
the LCD screen.
ACTION:
From the Main Menu, press the DOWN button to
highlight "Display Settings" then press Select.
DISPLAY:
ACTION:
Use the UP and DOWN buttons to highlight the
desired setting. Then press Change. Again, use the
UP and DOWN buttons to scroll through the options
for that setting.
DISPLAY:
ACTION:
Press Update to accept the change or Cancel to
reject it.
DISPLAY:

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 17 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
FAULT AND WARNING CONDITIONS – ADVANCED DIAGNOSTIC INFORMATION
The water heater control system has the ability to
monitor almost all aspects of the water heater's
operation. In the case that there is an undesirable or
unsafe condition that occurs, the control system will
detect this condition and determine the appropriate
action. The water heater control will display the
information on the desktop in plain text that accurately
describes the condition and diagnostics information
that can be used to correct the issue.
There are two types of conditions that can occur
during operation. These are Warnings and Faults:
Warnings: This is a non-safety related condition that
the control has detected that may cause the water
heater to operate in a less than optimal condition, but
does not pose a safety concern.
NOTE: When these conditions occur, continued
heating cycles will continue and the heater will attempt
to regulate the water in the tank to the Operating Set
Point.
Example of a Warning:
Faults: This is a safety related condition that has been
detected by the control system.
NOTE: When these conditions occur, the water heater
WILL NOT CONTINUE any further heating cycles and
the water will no longer be heated until the condition is
corrected and, in most cases, power has been cycled.
Example of a Fault:
Advanced Diagnostic Information
When a fault or warning has been declared, advanced
information can be found by pressing the Advanced
button, there more detailed information can be found
regarding diagnosing and resolving the problem.
WARNING: Usage of the Advanced information
requires ability equivalent to that of a licensed
tradesmen in the field involved.

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 18 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
CURRENT FAULT OR WARNING
When a fault or warning condition has been declared
by the control system it will automatically be displayed
on the UIM display and the back light will blink. You
can choose to leave the current fault or warning
message by pressing the Back key. You can return to
the current fault or warning message through the
control system menu.
ACTION:
To access the current fault or warning message,
press MENU from the default “Desktop” screen.
DISPLAY:
ACTION:
Press the DOWN button until the “Current Fault” sub
menu is highlighted then press the SELECT button.
DISPLAY:

High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department 19 Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
VIEWING THE FAULT HISTORY – WATER HEATER INFORMATION
The control system for this water heater will store a
history of ten of the last Fault and Warning
conditions that occurred. This is stored in the Fault
History. The information about the fault or warning will
include diagnostic information as well as an estimate
of how long ago the fault occurred.
ACTION:
Press the SELECT button for more information.
DISPLAY:
ACTION:
Press the DOWN key to scroll through the fault
history. If you select a specific fault or warning, you
may press the VIEW button to view details regarding
this fault.
DISPLAY:
Viewing Information About the Water Heater
The control system for this water heater monitors
many different aspects of operation to ensure safe and
optimal performance. Much of this information can be
viewed using two control system menus; the "Heater
Status" menu and the "Heater Information" menu.