Rinnai RUC80i, RUC98i RU80e, RU98e Troubleshooting guide

15/4/2018
© 2016 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Rinnai Condensing Tankless
Water Heater Training Program
Level III
Service Fundamentals

25/4/2018
© 2014 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
The following Rinnai Condensing
Tankless Water Heater Level III,
Service Fundamentals course is
approved for NATE continuing
education units in the following
specialties.
Efficiency Analyst Senior –6 units
Gas Heating (Air) Installation –6 units
Gas Heating (Air) Service –6 units
HVAC Performance Verifier –6 units
Hydronics Gas Installation –6 units
Hydronics Gas Service –6 units
Hydronics Oil Installation –6 units
Hydronics Oil Service –6 units
Oil Heating (Air) Installation –6 units
Oil Heating (Air) Service –6 units
If you require credit
for NATE, please
notify the instructor.

35/4/2018
© 2016 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Rinnai SE+and Commercial Series Condensing
Water Heaters.
C199
Commercial
Series
RU/RUC/RUR
SE+Series.

45/4/2018
© 2016 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Rinnai Service and Support (800-621-9419)
➢CRC –Consumer Response Center –general calls, consumer questions, etc.
Available from 8 a.m. to 8 p.m. EST, Monday –Friday.
➢Parts Department –parts orders.
Available from 8 a.m. to 8 p.m. EST, Monday –Friday.
➢Warranty Department –warranty claim issues.
Available from 8 a.m. to 5 p.m. EST, Monday- Friday.
➢Technical Support Department –technical issues related to the function and repair of Rinnai
products.
Available in the office from 8 a.m. to 8 p.m. EST, Monday –Friday AND 24/7/365 on call support for
technicians who are at the service location. Technicians only, call 1-888-RINNAIS ( 888-746-6247)
➢Engineering / Applications Department –calls related to product use and applications
including sizing.
Available from 8 a.m. to 5 p.m. EST, Monday - Friday.
Rinnai America also provides the following websites for support:
•www.rinnai.us –for installation manuals, product specifications and supporting documents. More technical information is
available in the “Partner Portal” section of the website. Registration is required for access.
•www.trainingevents.rinnai.us –to register for Rinnai product training live and online classes and videos. Service manuals,
installation manuals and other technical documents are available under the “Resources” section of the site.

55/4/2018
© 2016 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Model
Designation Full Model Number Min
Btu’s
Max
Btu’s
Min
Activation
Flow Rate
(approx.)
Max Flow
Rate 35°
Rise
Max Flow
Rate 50°
Rise
Max Flow
Rate 70⁰
Rise
UEF
Rating
RUC80i REU-KBD2530FFUD-US 15.2K 152K 0.4 GPM 8.0 GPM 6.0 GPM 4.2 GPM .92
RU80e REU-KB2530WD-US
RUC90i REU-KBD2934FFUD-US 15.2K 180K 0.4 GPM 9.0 GPM 6.9 GPM 5.0 GPM .92
RU90e REU-KB2934WD-US
RUC98i REU-KBD3237FFUD-US 15.2K 199K 0.4 GPM 9.8 GPM 7.6 GPM 5.4 GPM .92
RU98e REU-KB3237WD-US
RUR98i REU-KBP3237FFUD-US 15.2K 199K 0.4 GPM 9.8 GPM 7.6 GPM 5.4 GPM .92
RUR98e REU-KBP3237WD-US
Specifications: SE+and Commercial series.
SE+and Commercial Series: Condensing models.
C199i REU-KBD3237FFUDC-US 15.2K 199K 0.4 GPM 9.8 GPM 7.6 GPM 5.4 GPM 96%
Thermal
Efficiency
C199e REU-KBD3237WDC-US

65/4/2018
© 2016 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Before Performing Service:
•Disconnect the electrical power source.
•Shut off the gas supply.
•Shut off the water supply and drain down the system.
Note:
1. All components in Rinnai tankless water heaters are field replaceable.
2. All major replacement parts are accompanied with replacement procedures.
3. Rinnai will pay reasonable labor for warranty parts changed during the labor warranty
period. Normally one hour labor will be paid for most parts and two hours for the heat
exchanger.
General Service Instructions:

75/4/2018
© 2016 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
For service, troubleshooting, and component replacement, the following primary service
tools will be needed (other hand tools might be needed on occasion).
Long #2
Phillips Head
(magnetic)
Small
Phillips
Head U-
Tube Digital Multimeter
(Volt/Ohm Meter)
Screw Drivers Manometer
and or
If Rinnai technical support assistance is required please have these tools available in order to
speed up the troubleshooting process. Also, Rinnai needs to know the full model and serial
number of the product. Have the front cover removed from the product, record and provide any
relevant information such as gas pressures, set temperature, fault codes etc. The service
provider should utilize the tech sheet and/or service manual to troubleshoot the product as
much as possible prior to the call.
Primary Service Tools

85/4/2018
© 2016 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Water Heater
DISASSEMBLY & REASSEMBLY
The following procedures are for KB series water heaters.
Other Rinnai models may vary slightly in design and service requirements.
Please refer to each model’s install guide and service documentation for
model specific information.
PLEASE STAY WITH THE PRESENTATION DURING DISASSEMBLY AND
REASSEMBLY.

95/4/2018
© 2016 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Front Panel Removal
To remove front cover press on the
plastic strip roughly 3” down from the top
of the unit and 3” up from the bottom.
(See circles shown for approximate position).
Slide the plastic strips to the side to
remove from the unit. This will expose
the 4 screws securing the front cover.
Removing the four Phillips head screws
and remove the front cover.

10 5/4/2018
© 2016 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
Front Panel Information
Located inside the front cover panel of
all Rinnai Tankless water heaters you
will find a wiring diagram and technical
data sheet. The technical data sheet
contains operation, troubleshooting and
service information including:
•Error code information
•Dip switch/gas pressure settings
•Electrical component test values
•Temperature controller information
•Parts breakdown and part numbers
Technical data sheet
Wiring diagram