Rheem IKONIC RTGH-S11i User manual

TANKLESS
WATER HEATERS
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 03

IKONIC Tankless Water Heater Service Manual 2
CONTENTS
SAFETY AND INTRODUCTION .......................................................................................................4
TROUBLESHOOTING TOOLS.........................................................................................................5
MEASURING VOLTAGE AND RESISTANCE ..............................................................................5
GENERAL INFORMATION.............................................................................................................6
CROSSOVER VALVE ............................................................................................................................................ 6
FUEL CONVERSION ............................................................................................................................................. 6
SPECIFICATIONS.................................................................................................................................................. 7
FLOW RATE........................................................................................................................................................... 8
PRESSURE DROP AND TEMPERATURE RISE CURVE ..................................................................................... 9
DIRECT-VENT GAS COMPONENTS .................................................................................................................... 10
DIRECT-VENT GAS COMPONENTS RECIRCULATION MODEL ........................................................................ 11
SPECIFICATIONS AND INSTALLATION GUIDELINES......................................................................................... 12
GAS / CONDENSATION ........................................................................................................................................ 14
CONTROL BOARD CONNECTORS...................................................................................................................... 15
DIAGNOSTIC POINTS ON CONTROL BOARD .................................................................................................... 16
USER INTERFACE AND OPTIONS .................................................................................................18
QUICK LOOK MODE / MENU OPTIONS............................................................................................................... 18
LCD ON USER INTERFACE / SETTING TO ENABLE AND DISABLE.................................................................. 19
STATUS MENU ...................................................................................................................................................... 20
TANKLESS STATUS / WIFI STATUS .................................................................................................................. 20
WIFI SETTING / WIFI SETUP............................................................................................................................. 21
SETTINGS MENU .................................................................................................................................................. 22
SET POINT TEMPERATURE ............................................................................................................................. 23
TEMPERATURE DISPLAY / BEEP ON ALARM ................................................................................................. 24
TANKLESS CONFIGURATION............................................................................................................................... 25
RECIRCULATION – TIMER MODE.................................................................................................................... 25
RECIRCULATION – ON DEMAND MODE ......................................................................................................... 26
RECIRCULATION – MANUAL RECIRCULATION PUMP OPERATION............................................................. 27
RECIRCULATION – SCHEDULE MODE............................................................................................................ 27
HIGH ALTITUDE ADJUSTMENT ........................................................................................................................ 28
WATER SAVING CONTROL............................................................................................................................... 29
SETTING MANIFOLD HEATERS ....................................................................................................................... 29
NETWORK INSTANCE....................................................................................................................................... 30
SERVICE MENU..................................................................................................................................................... 31
BURNER STAGING............................................................................................................................................ 32
VIEWING CURRENT ALARMS / CLEARING CURRENT ALARMS / ALARM HISTORY................................... 33
CLEARING ALARM HISTORY / MANIFOLD ROTATE....................................................................................... 33
RESET DEFAULT SETTINGS / SERVICE ALERTS........................................................................................... 35
RESET WIFI SETTINGS..................................................................................................................................... 36
ERROR CODE DIAGNOSTICS......................................................................................................37
NO ERROR CODE AND NO HOT WATER ........................................................................................................... 37
ERROR A011.......................................................................................................................................................... 38
ERROR A012 ......................................................................................................................................................... 41
ERROR A014 ......................................................................................................................................................... 43
ERROR A018 ......................................................................................................................................................... 44

IKONIC Tankless Water Heater Service Manual
3
CONTENTS
ERROR A029 ......................................................................................................................................................... 45
ERROR A031 ......................................................................................................................................................... 46
ERROR A032 ......................................................................................................................................................... 47
ERROR A033 ......................................................................................................................................................... 48
ERROR A035 ......................................................................................................................................................... 49
ERROR A036 ......................................................................................................................................................... 50
ERROR A055 ......................................................................................................................................................... 51
ERROR A061 ......................................................................................................................................................... 52
ERROR A063 ......................................................................................................................................................... 53
ERROR A065 ......................................................................................................................................................... 54
ERROR A066 ......................................................................................................................................................... 55
ERROR A070 ......................................................................................................................................................... 56
ERROR A071 ......................................................................................................................................................... 57
ERROR A072 ......................................................................................................................................................... 58
ERROR A082 ......................................................................................................................................................... 59
ERROR A090 ......................................................................................................................................................... 60
ERROR A200 ......................................................................................................................................................... 61
ERROR A2## ......................................................................................................................................................... 62
ERROR T110.......................................................................................................................................................... 63
NOTIFICATION T111.............................................................................................................................................. 64
NOTIFICATION T113 ............................................................................................................................................. 65
NOTIFICATION T115 AND ERROR T116 .............................................................................................................. 66
HOW TO REMOVE COMPONENTS..............................................................................................67
FRONT COVER ..................................................................................................................................................... 67
GAS-AIR RATIO VALVE......................................................................................................................................... 68
FLAME AND IGNITER ROD................................................................................................................................... 69
FLAME AND IGNITER ROD GASKET................................................................................................................... 70
WATER INLET CONNECTION............................................................................................................................... 71
WATER CONTROL VALVE AND WATER BYPASS VALVE ................................................................................... 72
CONDENSATION TRAP / OUTLET THERMISTOR............................................................................................... 73
IGNITER COIL........................................................................................................................................................ 74
BLOWER................................................................................................................................................................ 75
DISPLAY................................................................................................................................................................. 76
CONTROL BOARD ................................................................................................................................................ 77
POWER CORD ...................................................................................................................................................... 78
THERMISTOR WIRING HARNESS....................................................................................................................... 79
GAS CONTROL WIRING HARNESS..................................................................................................................... 80
FAN CONTROL WIRING HARNESS / HIGH VOLTAGE GROUND WIRING ........................................................ 81
POWER CONTROL WIRING HARNESS............................................................................................................... 82
DISPLAY CONTROL WIRING HARNESS ............................................................................................................. 83
ORIFICE PLATE..................................................................................................................................................... 84
HOW TO CONNECT .......................................................................................................................86

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 sup-
port prior to attempting to service to this tankless 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 repairing
or servicing an IKONIC water heater. Any questions re-
garding 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 safety and
warning labels on the water heater. Follow the instruction
on these warning labels. Read and understand the Use
and Care Manual that was shipped with the water heater.
Failure to do so can result in unsafe operation of the wa-
ter heater resulting in property damage, 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 qualied professional.
ELECTRICAL SHOCK
Troubleshooting and repairing this water heater can
expose you to electrical shock. Some of the diagnostic
procedures require the presence of AC and DC volt elec-
tricity. Use extreme caution when performing these pro-
cedures. When replacing a serviceable component, turn
off all power to the water heater and check for the pres-
ence of power with a multi meter or test lamp.
The ignition cable carries more than 10,000 volts of elec-
trical energy. Use extreme caution when diagnosing 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 burner as-
sembly 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 considered
when selecting the water temperature setting on the ther-
mostat. 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 increases
the potential 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 important. This
manual is only intended for qualied service techni-
cians. 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 LEADS
Used to testing
in compact
connectors.
MULTI-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 electri-
cal components.
WHEN INSERTING LEADS INTO WIRING CONNECTOR in-
sert on the wiring side to prevent damage to connector.
BEFORE MEASURING RESISTANCE, TURN OFF all electri-
cal power and make sure to REMOVE CONNECTOR from
the circuit (control board). Check resistance on connec-
tor that was removed.
WHEN MEASURING VOLTAGE, DO NOT REMOVE CON-
NECTOR; insert multimeter leads prior to operating unit.
WHEN MEASURING DC VOLTAGE, if the meter displays
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
If a crossover valve is used, it should be located at the
farthest faucet. See drawing below for information re-
garding crossover valve placement.
Approved Crossover Valves:
• Grundfos Comfort Valve - RTG20285
• Aquamotion - AMK-ODR
• Navien Navicirc - PFFW-SXX-001
NOTE: DO NOT install multiple crossover valves when
using only one Tankless Water Heater.
NOTE: To ensure optimal performance and reliability,
only one of the approved crossover valves should be
used.
FUEL CONVERSION
Fuel conversion kits are shipped with wholesale units
only and contain an LP orice plate, an LP gas chip, and
fuel conversion instructions (AP19636).
The conversion kit also includes a gas conversion label
(pictured at the right).
Retail units are set up as either natural gas or LP. If in-
stalled on the wrong gas type a conversion kit may be
available. Call Technical Support for information on con-
version kits.
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
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. - 10.5 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 8
GENERAL INFORMATION
SPECIFICATIONS 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 3.9 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
9
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 10
GENERAL INFORMATION
Ref # Description
1Control Board
2Gas Valve
3Blower Assembly
4Venturi
5Gas Inlet Connector
6Water Control Valve
7Water Inlet Connector
8Inlet Water Filter
9Hot Outlet Connector
10a Display Assembly "Non- WiFi"
10b Display Assembly "WiFi"
11 Condensate Trap
12 Air Intake Connector
13 Flue Connector
14 Front Cover
15 Gas Orifice Block
16 Gas Inlet Pipe
17 Air Filter
18 Igniter and Flame Rod
19 Plastic Screw Covers
20 Elbow Connection
21 Inlet Pipe B
22 Inlet Pipe R
23 Water Outlet Pipe
24 Water Outlet Elbow
5
2
15
4
3
10
20
20
22
20
21
23
24
12
13
14
11
6
7
17
18
19
19
8
9
16
DIRECT-VENT GAS COMPONENTS
1