Rheem IKONIC RTGH-S11i User manual

TANKLESS
WATER HEATERS
NL ENGINEERING CENTER
TECHNICAL TRAINING AND
SERVICE MANUAL
RTGH-S11i RTGH-S10i RTGH-S84i
RTGH-SR11i RTGH-SR10i RTGH-SR84i
CRTGH-S11i CRTGH-S10i CRTGH-S84i
CRTGH-SR11i CRTGH-SR10i CRTGH-SR84i
RUTGH-S11i RUTGH-S10i RUTGH-S84i
RUTGH-SR11i RUTGH-SR10i RUTGH-SR84i
CRUTGH-S11i CRUTGH-SR11i
AP23209 Rev 02

IKONIC Tankless Water Heater Service Manual 2
TECHNICAL SUPPORT LINE
Phone: [phone]
Fax: [phone]
ORDER CENTER
1-800-621-5622
RHEEM WATER HEATERS
800 Instestate Park Dr.
Montgomery, AL 36109
Website: www.Rheem.com
e-mail: T[email protected]
CONTENTS
SAFETY AND INTRODUCTION .......................................................................................................4
TROUBLESHOOTING TOOLS.........................................................................................................5
MEASURING VOLTAGE AND RESISTANCE ..............................................................................5
GENERAL INFORMATION.............................................................................................................6
CROSSOVER VALVE ............................................................................................................................................ 6
FUEL CONVERSION ............................................................................................................................................. 6
PRESSURE DROP AND TEMPERATURE RISE CURVE ..................................................................................... 7
GAS / CONDENSATION ........................................................................................................................................ 8
SPECIFICATIONS.................................................................................................................................................. 9
SPECIFICATION AND INSTALLATION GUIDELINES........................................................................................... 10
DIRECT-VENT GAS COMPONENTS .................................................................................................................... 11
DIRECT-VENT GAS COMPONENTS RECIRCULATION MODEL ........................................................................ 12
CONTROL BOARD CONNECTORS...................................................................................................................... 15
DIAGNOSTIC POINTS ON CONTROL BOARD .................................................................................................... 16
LCD ON THE USER INTERFACE / SETTING TO ENABLE AND DISABLE ......................................................... 18
SETTING OPERATION MODE .............................................................................................................................. 19
STATUS MENU ITEMS DESCRIPTION / TANKLESS STATUS............................................................................. 20
QUICK LOOK MODE ............................................................................................................................................. 21
WIFI STATUS / WIFI SETTING .............................................................................................................................. 22
SETTING MENU ITEMS DESCRIPTION............................................................................................................... 23
SETTING TEMPERATURE DISPLAY / SETTING BEEP ON ALARM ................................................................... 25
NETWORK INSTANCE / TANKLESS CONFIGURATION / TIMER MODE............................................................ 26
RECIRCULATION OPERATION TIMER MODE..................................................................................................... 27
RECIRCULATION OPERATION ON DEMAND / SCHEDULE MODE ................................................................... 28
MANUAL OPERATING OF RECIRC. PUMP (FOR DEMAND).............................................................................. 29
RECIRCULATION OPERATION MANUALLY OPERATE PUMP........................................................................... 30
SETTING MANIFOLD HEATERS........................................................................................................................... 31
SERVICE MENU ITEMS DESCRIPTION............................................................................................................... 32
VIEWING ACTIVE ALARMS................................................................................................................................... 33
CLEARING THE CURRENT ALARMS................................................................................................................... 34

IKONIC Tankless Water Heater Service Manual
3
CONTENTS
RESET THE DEFAULT SETTINGS........................................................................................................................ 35
RESET WIFI SETTING .......................................................................................................................................... 36
ERROR CODE DIAGNOSTICS......................................................................................................37
NO ERROR CODE AND NO HOT WATER / WATER FLOW SENSOR................................................................. 37
ERROR CODE LIST............................................................................................................................................... 38
HOW TO REMOVE COMPONENTS..............................................................................................67
REMOVE FRONT COVER..................................................................................................................................... 67
GAS-AIR RATIO VALVE......................................................................................................................................... 68
FLAME ROD .......................................................................................................................................................... 69
GASKET................................................................................................................................................................. 70
WATER INLET CONNECTION 3/4 ........................................................................................................................ 71
WATER CONTROL VALVE .................................................................................................................................... 72
BYPASS VALVE ..................................................................................................................................................... 73
NEUTRALIZER / OUTLET THERMISTOR............................................................................................................. 74
IGNITER COIL / IGNITER ROD ............................................................................................................................. 75
BLOWER................................................................................................................................................................ 76
DISPLAY ONLY ...................................................................................................................................................... 77
DISPLAY WITH DISPLAY MOUNTING BRACKET / CONTROL BOARD ONLY ................................................... 78
CONTROL BOARD ONLY / POWER CORD.......................................................................................................... 79
THERMISTOR WIRING HARNESS....................................................................................................................... 80
GAS CONTROL WIRING HARNESS..................................................................................................................... 81
FAN CONTROL WIRING HARNESS ..................................................................................................................... 82
POWER CONTROL WIRING HARNESS............................................................................................................... 83
DISPLAY CONTROL WIRING HARNESS ............................................................................................................. 84
ORIFICE PLATE (NAT/LP) ..................................................................................................................................... 85
HOW TO CONNECT .......................................................................................................................87
CONNECTING TO WIFI......................................................................................................................................... 87
DIAGNOSTIC MODE ......................................................................................................................90

IKONIC Tankless Water Heater Service Manual 4
The purpose of this manual is to provide technical and
troubleshooting information to technicians and service
professionals ONLY. Homeowners should consult the
Use and Care Manual ( AP22745) for general informa-
tional and installation inquiries or contact technical
support prior to attempting to service to this electric
water heater.
It is imperative that all persons who are expected to in-
stall, repair or adjust this water heater read this and the
Use and Care manual. This manual is intended solely
for professional technicians intending to assist in re-
pairing or servicing an IKONIC water heater. Any ques-
tions regarding the operation, maintenance, service or
warranty of this water heater should be directed to the
seller from whom it was purchased.
READ THE SAFETY
INFORMATION
Before inspecting, diagnosing, repairing or operating
any water heater, be sure to examine all of the safe-
ty and warning labels on the water heater. Follow the
instruction on these warning labels. Read and under-
stand the Use and Care Manual that was shipped with
the water heater. Failure to do so can result in unsafe
operation of the water heater resulting in property dam-
age, bodily injury, or death. If you have any problems
reading or following the instructions in the Use and
Care Manual, seek the help of a licensed and qualified
professional.
ELECTRICAL SHOCK
Troubleshooting and repairing this water heater can
expose you to electrical shock. Some of the diagnos-
tic procedures require the presence of AC and DC volt
electricity. Use extreme caution when performing these
procedures. When replacing a serviceable component,
turn off all power to the water heater and check for the
presence of power with a multi meter or test lamp.
The ignition cable carries more than 10,000 volts of
electrical energy. Use extreme caution when diagnos-
ing the Tankless Gas Water Heater.
FLAMMABLE LIQUIDS AND
VAPORS
Gasoline, as well as other flammable material and liquids
(adhesives, solvents, etc.), and their vapors are extremely
dangerous. DO NOT handle, use or store gasoline or other
flammable or combustible materials anywhere near or in
the vicinity of a water heater. The spark ignition and burn-
er assembly in the water heater controls can ignite these
vapors. Failure to do so can result in property damage,
bodily injury or death.
WATER TEMPERATURE
ADJUSTMENT
Safety and energy conservation are factors to be consid-
ered when selecting the water temperature setting on the
thermostat. Water temperatures above 125 F can cause
severe burns or death from scalding. The chart shown
here may be used as a guide in determining the proper
water temperature for your application.
SAFETY AND INTRODUCTION
DANGER
!
HOT
Water temperature over 125°F (52°C)
can cause severe burns instantly or
death from scalds.
Children, disabled and elderly are
at highest risk of being scalded.
See instruction manual before
setting temperature at water
heater.
Feel water before bathing or
showering.
Temperature limiting valves are
available, see manual.
BURN
Temperature Time To Produce a Serious Burn
120°F (49°C) More than 5 minutes
125°F (52°C) 1½ to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
Table courtesy of Shriners Burn Institute
The temperature of
the water in the heater
is regulated by the
electronic control and
surface mounted tem-
perature sensors.
DANGER:
Hotter water in-
creases the poten-
tial for Hot Water
SCALDS.
!

IKONIC Tankless Water Heater Service Manual
5
TROUBLESHOOTING TOOLS
MEASURING VOLTAGE AND RESISTANCE
SAFETY FIRST
Your safety and safety of others is very impor-
tant. This manual is only intended for qualified
service technicians. ALWAYS USE CAUTION
while testing voltages and/or gas supply.
MULTI-METER
Used to measure
Resistance and
voltage.
MANOMETER
Used to measure
gas pressure
during standby
and operation.
NEEDLE LEADSMULTI-METER
NEEDLE SET
Used on meter test leads
to access connectors while
measuring Resistance &
Voltage.
WARNING
WHILE MEASURING VOLTAGE, DO NOT cross/touch
multi meter leads together. This will cause damage to
electrical components.
WHEN INSERTING LEADS INTO WIRING CONNEC-
TOR insert on the wiring side to prevent damage to
connector.
BEFORE MEASURING RESISTANCE, TURN OFF all
electrical power and make sure to REMOVE CONNEC-
TOR from the circuit (control board). Check resistance
on connector that was removed.
WHEN MEASURING VOLTAGE, DO NOT REMOVE
CONNECTOR; insert multimeter leads prior to operat-
ing unit.
WHEN MEASURING DC VOLTAGE, if the meter dis-
plays the dash ( (------) swap the position of your black
and red leads on the connector.
!
WARNING: DO NOT touch any grounding
areas.
!

IKONIC Tankless Water Heater Service Manual 6
GENERAL INFORMATION
Power receptacle
should be close to
appliance
Tankless
water heater
power cord
Cold
Cold
To fixture
Hot
Hot
Service
valves
Fixtures
Hot Cold Hot Cold
Cold
water line
Expansion
tank
Install Thermal Bypass
(Crossover) Valve
at the farthest fixture
Cold water
to tankless
water heater
Cold water
supply
(Copper pipe)
Check
valve
Shut-off
valve
Shut-off
valve
(Copper pipe)
GENERAL PRODUCT INFORMATION
CROSSOVER VALVE
The crossover valve (Grundfos RTG20285 ONLY) should
be located at the farthest faucet and has a flow rate of
approximately 1.0 GPM. See drawing below for infor-
mation regarding crossover valve placement.
NOTE: DO NOT install multiple crossover valves
when using only one Tankless Water Heater.
FUEL CONVERSION
Fuel conversion kits are shipped with wholesale units
only and contain an LP orifice plate, an LP gas chip,
and fuel conversion instructions (AP19636).
The conversion kit also includes a gas conversion label
(pictured at the right).
THIS WATER HEATER WAS CONVERTED ON
(DAY-MONTH-YEAR) (A)
TO LP GAS WITH KIT NO.
BY (8)
(name and address of organization
making this conversion, who accepts
the responsibility for the
correctness of this conversion.)
TYPE OF GAS: LP GAS
MAX. INLET GAS PRESSURE: " w.c.
MIN. INLET GAS PRESSURE: " w.c.
MAX INPUT: BTU/HR
MIN. INPUT: BTU/HR
MANIFOLD PRESSURE: "w.c.
(FOR MAX. INPUT)
CONVERTED TO LP GAS
WITH KIT NO.
ORIFICE: "w.c.
1
6
2
3
4
5
6
8 7

IKONIC Tankless Water Heater Service Manual
7
GENERAL INFORMATION
IKONIC PRESSURE DROP
NOTE: Pressure drop curve for IKONIC is different
from existing condensing model. See table below for
IKONIC Pressure Drop information.
60
55
50
45
40
35
30
25
20
15
10
5
0
12
11
10
9
8
7
6
5
4
3
2
1
0
0 20 40 60 80 100 120
0.0 2.0 4.0 6.0 8.0 10.0 12.0
140
120
100
80
60
40
20
0
Pressure Drop (PSI)
Water Flow Rate (GPM)
Delta T - Temperature Rise (°F)
Pressure Drop (ft of head)
Water Flow Rate (GPM)
199k Btu/h 180k Btu/h 157k Btu/h
Pressure Drop Curve
Temperature Rise Curve
199k Btu/h 180k Btu/h 157k Btu/h
60
55
50
45
40
35
30
25
20
15
10
5
0
12
11
10
9
8
7
6
5
4
3
2
1
0
0 20 40 60 80 100 120
0.0 2.0 4.0 6.0 8.0 10.0 12.0
140
120
100
80
60
40
20
0
Pressure Drop (PSI)
Water Flow Rate (GPM)
Delta T - Temperature Rise (°F)
Pressure Drop (ft of head)
Water Flow Rate (GPM)
199k Btu/h 180k Btu/h 157k Btu/h
Pressure Drop Curve
Temperature Rise Curve
199k Btu/h 180k Btu/h 157k Btu/h
Graph above generated at 35°F Delta T. Graph below generated with 70°F (21°C) inlet water temperature

IKONIC Tankless Water Heater Service Manual 8
GENERAL INFORMATION
GAS
Proper gas size is imperative, as this unit may be able
to get sufficient gas but other appliances on the same
gas line will not. This could cause issues throughout
the home. Refer to U&C Manual for gas supply require-
ments.
CONDENSATION
Remove the cap to prevent an A029 error code. Con-
nect a ½” drain hose at the condensation drain (Shown
in yellow in following illustration.)
17 5
/
16"
(440 mm)
6 11
/
16"
(170 mm)
4 9
/
16"
(116 mm)
3 3
/
8"
(899 mm)
18 3
/
32"
(459 mm)
Air Intake
29 15
/
16"
(760 mm)
1 3
/
4"
(45 mm)
1 3
/
8"
(35 mm)
28 9
/
16"
(726 mm)
5"
(128 mm)
Exhaust Vent
2" (51 mm)
5" (127 mm) 111
/
4" (286 mm)
Hot Outlet
Fitting
Recirculation
Fitting
(Available only on
certain models)
Condensate
Drain
Cold Inlet
Fitting
13 1
/
8"
(333 mm)
4"
(101 mm)
13 11
/
16"
(348 mm)
6 11
/
16"
(170 mm)
5 11
/
32"
(135 mm)
Gas Supply Fitting
BOTTOM VIEW

IKONIC Tankless Water Heater Service Manual
9
GENERAL INFORMATION
1.1.1 SPECIFICATIONS
SPECIFICATION RTGH-S11i
RTGH-SR11i
RTGH-S10i
RTGH-SR10i
RTGH-S84i
RTGH-SR84i
Dimensions
Width 17.3 in (440 mm)
Height 28.6 in (726 mm)
Depth 13.7 in (348 mm)
Approval Gas Type Natural (NG) and Liquid Propane (LP)
Maximum Gas Consumption 199,900 Btu/h 180,000 Btu/h 157,000 Btu/h
Minimum Gas Consumption 11,000 Btu/h
Gas Supply Pressure
NG 4.0 in w.c. - 10.0 in w.c.
LP 8.0 in w.c. - 13.0 in w.c.
Minimum Activation Flow Rate 0.4 GPM
Extinction Flow Rate 0.26 GPM
Vent Size (Indoor Only) 2 in or 3 in
Service Connections
Gas Supply ¾ NPT
Cold Water Inlet ¾ NPT
Hot Water Outlet ¾ NPT
Recirculation Fitting
(Built-in Pump model
only)
¾ NPT
Electrical
Consumption
Normal 100 W
Standby 3.5 W
Antifreeze Protection 200 W

IKONIC Tankless Water Heater Service Manual 10
GENERAL INFORMATION
SPECIFICATIONS OF THE IKONIC AND INSTALLATION GUIDELINES
17 5
/
16"
(440 mm)
6 11
/
16"
(170 mm)
4 9
/
16"
(116 mm)
3 3
/
8"
(899 mm)
18 3
/
32"
(459 mm)
Air Intake
29 15
/
16"
(760 mm)
1 3
/
4"
(45 mm)
1 3
/
8"
(35 mm)
28 9
/
16"
(726 mm)
5"
(128 mm)
Exhaust Vent
2" (51 mm)
5" (127 mm) 111
/
4" (286 mm)
Hot Outlet
Fitting
Recirculation
Fitting
(Available only on
certain models)
Condensate
Drain
Cold Inlet
Fitting
13 1
/
8"
(333 mm)
4"
(101 mm)
13 11
/
16"
(348 mm)
6 11
/
16"
(170 mm)
5 11
/
32"
(135 mm)
Gas Supply Fitting
17 5
/
16"
(440 mm)
6 11
/
16"
(170 mm)
4 9
/
16"
(116 mm)
3 3
/
8"
(899 mm)
18 3
/
32"
(459 mm)
Air Intake
29 15
/
16"
(760 mm)
1 3
/
4"
(45 mm)
1 3
/
8"
(35 mm)
28 9
/
16"
(726 mm)
5"
(128 mm)
Exhaust Vent
2" (51 mm)
5" (127 mm) 111
/
4" (286 mm)
Hot Outlet
Fitting
Recirculation
Fitting
(Available only on
certain models)
Condensate
Drain
Cold Inlet
Fitting
13 1
/
8"
(333 mm)
4"
(101 mm)
13 11
/
16"
(348 mm)
6 11
/
16"
(170 mm)
5 11
/
32"
(135 mm)
Gas Supply Fitting
17 5
/
16"
(440 mm)
6 11
/
16"
(170 mm)
4 9
/
16"
(116 mm)
3 3
/
8"
(899 mm)
18 3
/
32"
(459 mm)
Air Intake
29 15
/
16"
(760 mm)
1 3
/
4"
(45 mm)
1 3
/
8"
(35 mm)
28 9
/
16"
(726 mm)
5"
(128 mm)
Exhaust Vent
2" (51 mm)
5" (127 mm) 111
/
4" (286 mm)
Hot Outlet
Fitting
Recirculation
Fitting
(Available only on
certain models)
Condensate
Drain
Cold Inlet
Fitting
13 1
/
8"
(333 mm)
4"
(101 mm)
13 11
/
16"
(348 mm)
6 11
/
16"
(170 mm)
5 11
/
32"
(135 mm)
Gas Supply Fitting
TOP VIEW
BOTTOM VIEW
FRONT VIEW

IKONIC Tankless Water Heater Service Manual
11
GENERAL INFORMATION
Ref # Description
1Control Board
2Gas Valve
3Burner Mesh
4Blower Assembly
5Venturi
6Gas Inlet Connector
7Water Control Valve
8Water Inlet Connector
9Inlet Water Filter
10 Hot Outlet Connector
11a Display Assembly "Non- WiFi"
11b Display Assembly "WiFi"
12 Condensate Trap
Ref # Description
13 Air Intake Connector
14 Flue Connector
15 Front Cover
16 Cabinet
17 Exhaust Duct Assembly
18 Gas Orifice Block
19 Burner Header
20 Gas Inlet Pipe
21 Air Filter
22 Ignitor
23 Flame Rod
24 Cover Screws
25 Plastic Screw Covers
15
13
16
6
10
21
22
23
8
9
2
18
19
3
5
4
7
1
11
20
12
14
17
DIRECT-VENT GAS COMPONENTS
24
24
24
25
25
24

IKONIC Tankless Water Heater Service Manual 12
GENERAL INFORMATION
15
13
16
6
10
21
22
24
25
26
23
8
9
2
18
19
3
5
4
7
1
11
20
27
27
27
28
28
27
12
14
17
DIRECT-VENT GAS COMPONENTS RECIRCULATION MODEL
Ref # Description
1Control Board
2Gas Valve
3Burner Mesh
4Blower Assembly
5Venturi
6Gas Inlet Connector
7Water Control Valve
8Water Inlet Connector
9Water Filter
10 Hot Outlet Connector
11 Display Assembly "WiFi"
12 Condensate Trap
13 Air Intake Connector
14 Flue Connector
Ref # Description
15 Front Cover
16 Cabinet
17 Exhaust Duct Assembly
18 Gas Orifice Block
19 Burner Header
20 Gas Inlet Pipe
21 Recirculation Connector
22 Recirculation Pump
23 Recirculation Pump Piping
24 Air Filter
25 Ignitor
26 Flame Rod
27 Cover Screws
28 Plastic Screw Covers

IKONIC Tankless Water Heater Service Manual
13
The vent exhaust and air intake shall terminate outside
as described in these instructions for direct vent ap-
plication. Combustion air requirements of room air ap-
plication shall follow “Room Air Application” in this Use
and Care Manual.
DO NOT vent this water heater through a chimney. It
must be vented separately from all other appliances.
NOTICE
The unit can be vented using only the following recom-
mended pipe material.
Use only 2 or 3 inch diameter pipe. Refer to local codes
for restrictions on the use of PVC, CPVC, or ABS pipe
and fittings. All exhaust venting materials for product
installed in Canada must meet ULC-S636. Acceptable
materials or equivalent:
• PVC (Schedule 40, ASTM D-1785)
• CPVC (Schedule 40, ASTM F-441)
• ABS (Schedule 40, ASTM D-2661) (Not permitted
in Canada)
The fittings other than the VENT TERMINAL should be
equivalent to the following:
• PVC (Schedule 40, DMW, ASTM D-2665)
• CPVC (Schedule 40, DMW, ASTM F-438)
• ABS (Schedule 40, DMW, ASTM D-2661) (Not per-
mitted in Canada)
• Category III Stainless Steel
Approved Polypropylene Vent Manufacturer/Trade
Name:
InnoFlue® by Centrotherm
Single Wall Pipe: ISVL**** or ISVL****UV
Elbow: ISELL**** or ISELL****UV
Adapter: ISAAL0202
Non-Return Valve (NRV): ISNRV****
Siphon: IASJBVS
Termination: ISLPT**** or ISTT****
(*Refers to variations in nominal size.)
DO NOT USE Schedule 20, Cell Core, Drain Pipe, Galvanized, Aluminum, or B-Vent.
GENERAL INFORMATION
SPECIFICATIONS OF THE IKONIC AND INSTALLATION GUIDELINES
1.1.2 VENTING FOR WATER HEATER
VENT SYSTEM
DIAMETER
MIN. ALLOWED EQUIVALENT
VENT LENGTH
MAX. ALLOWED EQUIVALENT
VENT LENGTH VENT SYSTEM
TERMINATION
Inches Feet Meters Feet Meters
2 1 0.3 70 21.3 90° Elbow
310.3 150 45.7 90° Elbow
A 90 elbow is equivalent to 6 ft.(1.83 m) of 2"diameter straight pipe, and to 5 ft.(1.52 m) of 3" diameter straight pipe.
A 45 elbow is equivalent to 3 ft. (0.9 m) of 2" diameter straight pipe, and to 2.5 ft. (0.75m) of 3" diameter straight pipe.

IKONIC Tankless Water Heater Service Manual 14
GENERAL INFORMATION
SPECIFICATIONS OF THE IKONIC AND INSTALLATION GUIDELINES
1.1.3 FLOW RATE
TEMPERATURE RISE (°F)
35 45 50 60 70 78 80 90 100
11.2 8.8 7.9 6.6 5.6 5.1 4.9 4.4 3.9
Max Water Flow - GPM (gallons per minute)
TEMPERATURE RISE (°F)
35 45 50 60 70 78 80 90 100
10.1 7.9 7.1 5.9 5.1 4.6 4.4 3.9 3.5
Max Water Flow - GPM (gallons per minute)
TEMPERATURE RISE (°F)
35 45 50 60 70 78 80 90 100
8.4 6.9 6.2 5.2 4.4 4.0 4.4 3.4 3.1
Max Water Flow - GPM (gallons per minute)
RTGH S11i ( SR11i)
RTGH S10i ( SR10i)
RTGH S84i (SR84i)

IKONIC Tankless Water Heater Service Manual
15
GENERAL INFORMATION
1.2 CONTROL BOARD CONNECTORS
*** GAS CHIP***
When replacing Control Board,
you must use the original chip on
the new Control Board.
New Control Board must be pro-
grammed.
CONNECTOR# MOLEX COLOR WIRE COLOR
A White White, Black, White, Black
B Blue Green / Yellow
C White Gray, Black, Yellow, Gray, Black, White
D White Yellow, Orange, Red, Blue, White
E White Green, White, Yellow, Black, Red
G White Brown, Brown, White, White, Orange, Orange, Blue, Blue, Yellow,
Yellow, Green, Green, Red, Red, Black, Black
H White White
I White Blue, Red, Red, Black, White, Black, Brown, Red, Yellow, White,
White, Black, Pink
J White Brown, White, Orange, Blue, Yellow, Green, Red, Black

IKONIC Tankless Water Heater Service Manual 16
GENERAL INFORMATION
1.3 DIAGNOSTIC POINTS ON CONTROL BOARD
CONNECTION # WIRE COLOR NORMAL VALUE WHAT ARE YOU CHECKING?
A
W1-BK2 AC 108 - 132 V Do you have power to the control
board?
W3-BK4 AC 108 - 132 V Do you have power to the pump?
C
GY1-GY4 AC 108 - 132 V Is the igniter working properly?
Y3-BK5 DC 90 - 120V
0.8kΩ- 2.4kΩSolenoid valve 1 OK?
W6-BK2 AC 108 - 132 V Gas - Air - Ratio valve OK?

IKONIC Tankless Water Heater Service Manual
17
GENERAL INFORMATION
1.3 DIAGNOSTIC POINTS ON CONTROL BOARD
CONNECTION # WIRE COLOR NORMAL VALUE WHAT ARE YOU CHECKING?
D
W6 - BL4 DC 144 - 192 V Does the fan motor have the proper voltage?
Y1 - BL4 DC 4 - 10 V
(Pulse) Is the fan motor producing regular pulse?
R3 - BL4 DC 12 - 18 V Does the fan motor have the proper voltage?
E R5 - BK4 DC 11 - 17 V Does the user interface have voltage?
H GY1 - GND AC 1 - 100 V Flame rod detecting flame?
I
W12 - W13 5KΩ- 500KΩIs the Over Heat Limiter OK?
BR9 - BK8
DC 2 - 5V
(Pulse)
More than 1,310
pulses/minute
Does the water flow sensor send a pulse?
(Only when water is flowing thru the unit)
R10 - BK8 DC 11 - 17V Does the water flow sensor have voltage?
(Power ON; no water flow)
W7 - BK5 68°F = 10.3 k Ω
104°F = 4.9 k ΩIs the water inlet thermistor working?
W13 - BK5 68°F = 10.3 k Ω
104°F = 4.9 k ΩIs the water outlet thermistor working?
Y11 - BK5 68°F= 10.3 k Ω
104°F= 4.9 k ΩIs the heat exchanger thermistor working?
R4 - BK5 68°F = 10.3 k Ω
104°F = 4.9 k ΩIs the exhaust thermistor working?
G
W4-BK16 4-16 DC volts Does water control valve have the proper
voltage
R14-BK16 4-16 DC volts Does water control valve have the proper
voltage
G12-BK16 4-10 DC volts Does water control valve have the proper
voltage
W3-BK15 4-16 DC volts Does water bypass control valve have the
proper voltage
R13-BK15 4-16 DC volts Does water bypass control valve have the
proper voltage
G11-BK15 4-10 DC volts Does water bypass control valve have the
proper voltage
J
W2-BK8 4-16 DC volts Does Gas motor have the proper voltage
R7-BK8 4-16 DC volts Does Gas motor have the proper voltage
G6-BK8 4-10 DC volts Does Gas motor have the proper voltage

IKONIC Tankless Water Heater Service Manual 18
This Tankless water Heater has the Liquid Crystal Dis-
play (LCD) on the user interface.
This user interface allows you to adjust the water tem-
perature and view the operating status or error codes.
GENERAL INFORMATION
1.4 LCD ON THE USER INTERFACE
SETTINGS
BACK ENTER
STATUS SERVICE MODE
SET POINT
UNLOCK / LOCK (HOLD 3 SEC)
Warning
Blower On
Recirculation On
Screen Lock
Burner On
Status
Icons
Set Point
Temperature
Control
Button
Indicator
Icons
Control
Buttons
Cloud Connectivity
Wi Fi
Diagnostic
1.4.1 SETTING TO ENABLE/DISABLE TO WATER HEATER
This tankless water heater can set the enable/disable mode with the Liquid Crystal Display (LCD) on the User Inter-
face.
1. Press the “MODE” button. After the LCD displays
“ENABLE/DISABLE”, press the “ENTER” button.
2. The factory setting is “DISABLE”. Press the “▼” or
“▲” button to select “ENABLE” or “DISABLE” and
press the “ENTER” button.
To exit this setting, press "BACK" button until initial
screen is displayed.
SETTINGS
BACK ENTER
STATUS SERVICE MODE SETTINGS
BACK ENTER
STATUS SERVICE MODE
DISABLEENABLE/DISABLE
SETTINGS
BACK ENTER
STATUS SERVICE MODE SETTINGS
BACK ENTER
STATUS SERVICE MODE
DISABLEENABLE/DISABLE

IKONIC Tankless Water Heater Service Manual
19
GENERAL INFORMATION
1.4.2 SETTING OPERATION MODE
This tankless water heater can set the operation mode
with the Liquid Crystal Display (LCD) on the User Inter-
face.
1. Display may need to be unlocked before the set-
tings can be changed. Push and hold two buttons
in center until beeping sound is heard. Once un-
locked the “SETTINGS”, “STATUS” or “SERVICE”
menus can be accessed.
2. Using the Liquid Crystal display (LCD) on the user
interface, Press and hold the right-most 2 buttons
for 5 seconds until a beeping sound is heard. This
will toggle the unit between enabled and disabled.
To exit the operation mode and return the water
heater to normal operation, press the “BACK” but-
ton.
SETTINGS
BACK ENTER
STATUS SERVICE MODE
SET POINT
SETTINGS
BACK ENTER
STATUS SERVICE MODE
SET POINT
SETTINGS
BACK ENTER
STATUS SERVICE MODE
SET POINT
SETTINGS
BACK ENTER
STATUS SERVICE MODE
120 °F
SETTINGS
BACK ENTER
STATUS SERVICE MODE
120 °F
SETTINGS
BACK ENTER
STATUS SERVICE MODE
115 °F
Center buttons
Press and hold both buttons
Lock icon
SETTINGS
BACK ENTER
STATUS SERVICE MODE

IKONIC Tankless Water Heater Service Manual 20
STATUS
TANKLESS STATUS
Current water heater
mode of operating
WIFI STATUS
Current WiFi mode of
operating
GENERAL INFORMATION
1.5 STATUS MENU ITEMS DESCRIPTION
This tankless water heater can show the operating sta-
tus with the LCD on the User Interface.
1.5.1 TANKLESS STATUS
1. Press the “STATUS” button as pictured below.
2. Press the “▲“ or “▼” button until “Tankless Status”
is displayed, and press the “ENTER” button.
3. Press the “▲”or “▼” button to navigate through
the menu items. The status menu items are in the
next section.
1.5.2 WIFI STATUS
1. Press the “STATUS” button.
2. Press the “▲“ or “▼” button until “WiFi Status” is
displayed, and press the “ENTER” button.
SETTINGS
BACK ENTER
STATUS SERVICE MODE
SET POINT
SETTINGS
BACK ENTER
STATUS SERVICE MODE
SET POINT
SETTINGS
BACK ENTER
STATUS SERVICE MODE
Tankless Status
SETTINGS
BACK ENTER
STATUS SERVICE MODE SETTINGS
BACK ENTER
STATUS SERVICE MODE
SET POINTWiFi Setup?
SETTINGS
BACK ENTER
STATUS SERVICE MODE
WiFi Setup?
SETTINGS
BACK ENTER
STATUS SERVICE MODE
Yes
SETTINGS
BACK ENTER
STATUS SERVICE MODE
SETTINGS
BACK ENTER
STATUS SERVICE MODE
WiFi Status
SET POINT
SETTINGS
BACK ENTER
STATUS SERVICE MODE
WiFi Reset