Tech Sheet

3. Once the desired seng number is selected, use the “On/O” buon on the
controller to change the selecon for the seng number.
Example: Display will change from 01A to 01b for Maximum Temperature seng
(as shown below).
4. To exit the parameters, press the “A” buon on the PC board for 1 second.
To Obtain Performance Data:
1. Press and hold the (Down) buon.
2. While holding the (Down) buon for 2 seconds, press and hold
the “On/O” buon (hold both buons simultaneously).
3. Use the (Up) and (Down) buons to scroll to the desired
performance informaon described below.
PERFORMANCE DATA ELECTRICAL DIAGNOSTICS
DIAGNOSTIC CODES
# DATA UNIT
01
Water Flow Rate x0.1 gal/min
02
Outgoing Temperature °F
03
Combuson Hours x100 Hours
04
Combuson Cycles See following informaon
05
Fan Frequency Hz
06
Addional Controllers Connected See following informaon
07
Water Flow Control Posion 0=Mid, 1=Open, 2=Closed
08
Inlet Temperature °F
09
Fan Current x10 mA
10
Total Bath Fill Amount gallons
11
HEX Outlet Temperature °F
12
By-Pass Flow Control Posion Degrees of opening
15
Freeze Protecon Temperature
(Indoor Unit Only)
°F
17
Freeze Protecon Temperature
(Outdoor Unit Only)
°F
19
Pump Hours x100 Hours
20
Pump Cycles See following informaon
21
Exhaust Temperature °F
DISPLAY CYCLE COUNT
000 to 999
x100 (0 to 99,900)
10– to 99-
x10,000 (100,000 to 990,000)
1-- to 6--
x1,000,000 (1,000,000 to 6,000,000)
2. Use the (Up) and (Down) buon on the controller to select a seng number
(See Parameter Sengs Table).
NOTE: Wiring diagram is available in manual and on the inside front cover.
Important Safety Notes
There are a number of (live) tests required when performing electrical
diagnoscs on this product. Proceed with cauon at all mes to avoid contact
with energized components inside the water heater. Only trained and
qualied service technicians should aempt to repair this product. Before
checking for resistance readings, disconnect the power source to the unit and
isolate the item from the circuit (unplug it).
Freeze Protecon
This unit has freeze protecon heaters mounted at dierent points to protect
the water heater from freezing. All of them should display a posive
resistance reading.
Flame Rod
Place one lead of your meter to the ame rod and the other to ground. With
the unit running you should read between 5 - 150 VAC. Set your meter to the
micro (μ) amp scale and arrange meter leads in line with the ame rod. You
should read 1 μ amp or greater for proper ame circuit. In the event of low
ame circuit, remove the ame rod and check for carbon or damage. The
ame rod gasket must be replaced aer it is removed.
Amp Fuses
This unit has two glass fuses located on the PC Board, one inline (10) amp and
one (4) amp glass fuse. Remove the fuses and check connuity through it. If
you have connuity through each fuse then it is funconing. Otherwise the
fuse is blown and must be replaced.
Thermistors
Check all thermistors by inserng meter leads into each end of the thermistor
plug. Set your meter to the 20 K scale and read resistance. Applying heat to
the thermistor bulb should decrease the resistance. Applying ice to the
thermistor bulb should increase the resistance.
Below are examples of typical temperatures and resistance readings.
(* Value to be measured while unit is in operaon)
03
Power Interrupon During Bath Fill
(Water will not ow when power returns)
• Turn o all hot water taps. Press ON/OFF twice.
05
By-Pass Flow Control
• Measure resistance or voltage values of the by-pass ow control
(See Electrical Diagnoscs).
• Replace By-Pass ow control device.
10
Air Supply or Exhaust Blockage/Condensate Trap is Full
• Ensure condensate line is not blocked.
• Ensure internal air lter is clean with no obstrucons. (Indoor Only)
• Ensure High Altude seng. (See Parameter Sengs)
• Ensure Combuson air and Exhaust vents are not blocked and approved venng
materials are being used. (Indoor Only)
• Ensure vent length is within limits. (Indoor Only)
• Check fan for debris and ensure wheel turns freely.
• Verify check valve is not stuck between fan casing and burner body.
11
No Ignion (Heater Not Turning On)
• Check that the gas is turned on at the water heater, meter, or cylinder.
• If the system is propane, make sure that gas is in the tank.
• Ensure gas type and inlet gas pressure are correct.
• Bleed all air from gas lines.
• Check the ground wire for the PC Board.
• Ensure ame rod wire is connected.
• Ensure igniter is operaonal. (See Electrical Diagnoscs)
• Check gas solenoid valves for open or short circuits. (See Electrical Diagnoscs)
• Verify gas orice is correct.
• Ensure condensate line is not blocked
12
No Flame
• Check that the gas is turned on at the water heater, gas meter, or cylinder.
• If the system is propane, make sure that gas is in the tank.
• Ensure ame rod wire is connected.
• Ensure gas type and inlet gas pressure is correct.
• Bleed all air from gas lines.
14
Heat Exchanger Overheat
• Measure resistance or voltage of Overheat Switch. (See Electrical Diagnoscs)
• Check heat exchanger surface for hot spots which indicate blockage due to scale
build-up.
• Refer to instrucons in manual for ushing heat exchanger. Hard water must be
treated to prevent scale build up or damage to the heat exchanger.
• Ensure it is not forced Hi seng.
15
Venturi Control
• Ensure the Venturi motor is operang correctly. (See Electrical Diagnoscs)
• Replace gas valve assembly.
• Clear diagnosc code by reseng the main power supply to the water heater.
16
High Outgoing Temperature
(safety shutdown because water heater is too hot)
• Conrm fan motor is funconing correctly.
• Replace the gas valve assembly.
17
Venturi Blockage
• Ensure Venturi isn't blocked.
• Please call Rinnai technical department.
19
Electrical Grounding
• Check all components for electrical short.
21
Data Transfer Error
• If the PCB has been replaced, ensure the data transfer process has been
completed.
25
Condensate Pump (Accessory)
• Conrm wire connecons and harness are good.
• Ensure condensate reservoir is empty and condensate pump is operang.
32
Outgoing Thermistor
33
Heat Exchanger Thermistor
• Check sensor wiring for damage.
• Measure resistance or voltage of sensor. (See Electrical Diagnoscs)
• Clean sensor of scale build-up.
• Replace sensor.
38
Exhaust Thermistor
41
Freeze Protecon Thermistor
• Check sensor wiring for damage.
• Measure resistance or voltage of sensor. (See Electrical Diagnoscs)
• Replace sensor.
51
Inlet Thermistor
• Check sensor wiring for damage.
• Measure resistance or voltage of sensor. (See Electrical Diagnoscs)
• Clean sensor of scale build-up.
• Replace sensor.
52
Gas Valve
• Check ame rod and wire for damage.
• Check gas solenoid valve for open or short circuit. (See Electrical
Diagnoscs)
• Replace gas valve assembly.
• Please call Rinnai technical department.
54
High Exhaust Gas Temperature
• Ensure condensate line is not blocked
• Ensure Heat Exchanger ns are clean and not blocked.
• Conrm inlet water temperature is not too high.
• Clear diagnosc code by reseng the main power supply to the water
heater.
61
Combuson Fan
• Check the motor wire harness for loose or damaged connecons.
• Measure resistance or voltage of motor wire harness. (See Electrical
Diagnoscs)
• Ensure the combuson fan spins freely.
63
Recirculaon Low Flow
• Ensure the inlet water lter is clean and free of debris.
• Ensure parameter sengs are correctly set for recirculaon mode.
• Ensure pump supply voltage.
• Ensure air is removed from the recirculaon line.
65
Water Flow Control
• Measure resistance or voltage values of the water ow control
(See Electrical Diagnoscs)
• The water ow control valve has failed to close during the bath ll funcon.
Immediately turn o the water and disconnue the bath ll funcon.
Contact a licensed professional to service the appliance.
70
PC Board
• Replace PC Board
71
Solenoid Valve Circuit
• Ensure dip switch on PC board is in the OFF posion.
• Ensure gas control wire is not loose or damaged.
• Ensure heater circuit is not grounded.
• Replace PC Board.
72
Flame Rod
• Check ame rod and wire for damage.
• Verify HEX is not leaking.
ss
(SS) Service Soon (Flush Heat Exchanger)
• 55 is a me-based service indicator set during installaon. Refer to the
Installaon and Operaon Manual for addional details on seng and
changing the 55 indicator.
• 55 indicates that it is me for service. The heat exchanger should be
ushed to prevent damage. Refer to the Installaon and Operaon Manual
for more informaon. Hard water must be treated to prevent scale
build-up or damage to the heat exchanger.
• To reset the 55 code, push the On/O buon on the temperature
controller 5 mes in 5 seconds.
NO CODE - Nothing happens when water ow is acvated
• Verify you have at least the minimum ow rate required to re unit.
• Measure the resistance or voltage of the water ow control sensor.
(See Electrical Diagnoscs)
• Clean inlet water supply lter.
• On new installaons ensure hot and cold water lines are not reversed.
SE
Cascade Diagnosc Display (Commercial units only)
• With cascade connecons, display will ash between “SE” and the selected
set temperature when an error code is displayed on any secondary unit .
FF
Maintenance Indicator
• Placeholder in Diagnosc code history
indicang that a service provider performed
maintenance or service.
• Enter this code aer performing
service by pressing (Up), (Down)
and “On/O” simultaneously.
• FF is visible on the monitor.
A
B
PARAMETER SETTINGS
Performance Data Table
Electrical Circuit Table
0 1 A
0 1 B
COMPONENT WIRE COLOR VOLTAGE RESISTANCE
COMPONENT PCB
CONNECTOR CONNECTOR PIN
Spark
Electrode
Red-Black 11~13VDC*
34 K ~ 40 K
ohms
D2 D 12-21
Combuson
Fan
Red-Black 7~48VDC* N/A D3 D 4-6
White-Black 10~12VDC* N/A D3 D 10-6
Yellow-Black 11~13VDC* N/A D3 D 8-6
Water Flow
Control Device
Red-Pink
N/A 44~52 ohms
D4 D 18-20
White-Blue D4 D 16-14
Grey-Orange 12~14VDC N/A D4 D 30-12
Venturi
Control Device
Blue-White
N/A 35~41 ohms
D5 D 5-7
Yellow-Red D5 D 11-9
Black-Red 12~14 VDC
N/A
D5 D 30-12
Black-Brown
less than
1VDC*
D5 D 30-25
Black-Grey
less than
1VDC*
D5 D 30-23
By-Pass Flow
Control Device
Red-Pink
N/A 44~52 ohms
D6 D 15-13
White-Blue D6 D 17-19
Gas Solenoid
Valve
Yellow-Black 11~13VDC* 18~22 ohms D7 D 29-27
Outgoing
Thermistor
White-White
N/A See Example
H1 H
3-2
Blue-Blue 8-11
Inlet
Thermistor
White-White H2 H 4-2
Exhaust
Thermistor
White-White H3 H 2-5
Heat
Exchanger
Thermistor
White-White H4 H 2-6
Freeze
Protecon
Thermistor
Yellow-Black H5 H 2-7
Overheat
Switch
Black-Black 11~13 VDC
less than 1
ohm
H6 H 28-14
Water Flow
Sensor
Black-Red 11~13 VDC
N/A
H7 H 30-12
Yellow-Black 4~7 VDC* H7 H 12-30
White-Black
AC108~132
VAC
N/A B1 B 1-2
Integrated
Pump
(Integrated
pump only)
White-Red 11~14VDC* N/A G4 G 1-6
Addional
Controller(s)
White-White 10~13 VDC N/A K - -
Temperature Resistance Readings
59°F 11.4 - 14KΩ
86°F 6.4 - 7.8KΩ
113°F 3.6 - 4.5KΩ
140°F 2.2 - 2.7KΩ
221°F 0.6 - 0.8KΩ
1
2
CONTROLLER MODEL CONNECTED NOT CONNECTED
MC
__1 __0
BC
_1_ _0_
BSC & BSC2
1__, 2__ (QTY2) 0__
Default display is 100.
_ depends on connecon status of another controller.
06
Controllers Connected
04
Combuson Cycles
20
Pump Cycles
To Display Diagnosc Codes:
1. Turn o the water heater by pressing the “On/O” buon.
2. Press and hold the “On/O” for 2 seconds and then the (Up) buon simultaneously.
3. The last 9 maintenance codes display and ash one aer the other.
4. To exit diagnosc codes and return the water heater to normal operaon, press and hold the “On/O” buon
for 2 seconds and then the (Up) buon simultaneously.
5. Turn on the water heater by pressing the “On/O” buon.
1
2
1
3
FF
3
3
1
3
U334-0787(00)
REU-NP(A)
100000786
2
2
Parameter Sengs Table
SETTING
#
SETTING
DESCRIPTION
SELECTION
A c
01
Maximum Set
Temperature
Residenal:
120°F
Residenal:
140°F
02
High Altude
(Installaon Loca-
on)
0 - 2,000 
(0 - 610 m)
2,001 - 5,400 
(610 - 1,646 m)
5,401 - 7,700 
(1,646 - 2,347 m)
7,701 - 10,200 
(2,347 - 3,109 m)
03
Service Soon
1
Disabled 0.5 Year 1 Year 2 Years
04
Recirculaon
Sengs
No
Recirculaon
Recirculaon
(Dedicated)
Recirculaon
(Crossover)
05
Recirculaon
Mode
2
Economy Comfort Commercial
5
07
Units in Standby
(EZConnect™)
2 1
10
Gas Type
(Factory Set)
NG LPG
11
Maximum Flow
Rate
4
Standard High
12
Water Heater
Model
(Factory set values
and not adjusta-
ble)
Without Pump
With Pump
(RUR)
With Pump
(RSC)
13
199
(3237)
160
(2530)
14
Internal
(Indoor)
External
(Outdoor)
15
6 Low Acvaon
Mode
On O
16
Pump Speed
Max Low
1 7*
First Day Pump
Operaon
Pump O Pump On
Default is A for all sengs below except 10, 12, 13, and 14 which are factory set.
1
Refer to the Installaon and Operaon Manual for more informaon on this seng.
2
Seng 05 is available only if seng 04 , 04c, or 04 is selected.
• Economy mode cycles the pump less oen, using less energy to maintain the
circulaon loop temperature.
• Comfort mode cycles the pump more frequently, ensuring the loop
temperature remains higher (but also uses more energy).
3
BMS = Building Management System
4
Selecng “High” will increase the water ow rate to the maximum capacity.
5
Commercial mode should not be used for residenal applicaons. Applicaon of
commercial mode may result in excessive machine wear and energy consumpon.
6
Low Acvaon Mode must be in the ON posion (15a) if crossover recirculaon is
selected.
*For the rst 24-hours of operaon, Smart-Circ will learn hot water usage paerns
and operate pump based on the learned paerns. On the rst day, when the tankless
water heater has no learned paerns, the unit can be set to no pump operaon
(Pump O/No Recirc) for the rst 24 hours or to the pump operang (Pump On/
Recirc) every 15 to 30 minutes for the rst 24 hours.
Visit www.rinnai-lms.com for addional troubleshoong resources
2
Rinnai America Corporaon connually updates materials, and as such, content is subject to change without noce. For further informaon, contact Rinnai at 1-800-621-9419 or visit www.rinnai.us
To Adjust the Parameters:
1. Press the “A” buon for 1 second.
If recirculaon water temperature is not adequate, conrm pump speed is set to
Max (Parameter 16a). Recirculaon ow rate must be greater than 0.4 GPM (1.5 L/
min).
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