Rinnai REU-KBD2530FFUD-US User Manual

Direct Vent Tankless Water Heater
Operaon Instrucons
Important Facts about your Water Heater
Thank you for purchasing a Rinnai Tankless Water Heater. For proper operaon and safety, it is
important to follow the instrucons and adhere to all safety precauons.
Read all of the instrucons and the warranty thoroughly before operang this water heater. Keep this
manual in a safe place.
NOTICE: Rinnai somemes shares customer contact informaon with businesses that we believe provide
products or services that may be useful to you. By providing this informaon, you agree that we can
share your contact informaon for this purpose. If you prefer not to have your informaon shared with
these businesses, please contact customer service and ask not to have your informaon shared. We
will however, connue to contact you with informaon relevant to the product(s) you registered and/or
you account with us.
— Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any
other appliance.
— WHAT TO DO IF YOU SMELL GAS
 Do not try to light any appliance.
 Do not touch any electrical switch; do not use any phone in your building.
 Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s
instrucons.
 If you cannot reach your gas supplier, call the re department.
— Installaon and service must be performed by a licensed professional.
If the informaon in these instrucons is not followed exactly, a re or
explosion may result causing property damage, personal injury, or death.
WARNING
FOR INDOOR APPLICATIONS ONLY
RUC80i .................. REU-KBD2530FFUD-US
RUC90i .................. REU-KBD2934FFUD-US
RUC98i .................. REU-KBD3237FFUD-US
FOR OUTDOOR APPLICATIONS ONLY
RU80e ................... REU-KB2530WD-US
RU90e ................... REU-KB2934WD-US
RU98e ................... REU-KB3237WD-US
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Rinnai REU-KBD2530FFUD-US Specifications

General

Brand	Rinnai
Model	REU-KBD2530FFUD-US
Category	Water Heater
Language	English

Summary

Rinnai Water Heater Important Facts

What to Do If You Smell Gas

Steps to take if a gas leak is detected, including immediate actions to ensure safety.

Rinnai Water Heater Operation Guidelines

Rinnai Water Heater Safety Precautions

Essential safety advice, including handling gas, electrical switches, and water damage.

Rinnai Water Heater Operating Procedures

Step-by-step guide for starting and operating the water heater safely.

Rinnai Water Heater Shutting Off Gas

Procedure for safely shutting off the gas supply to the water heater.

Rinnai Water Heater Temperature Settings

Setting the Rinnai Water Heater Temperature

Steps for adjusting the water temperature using the controller and important notices.

Rinnai Water Heater Diagnostic Codes

Rinnai Diagnostics: Ignition, Flame, Power

Troubleshooting no ignition, no flame, and power interruption issues.

Rinnai Diagnostics: Safety and Blockages

Rinnai Diagnostics: Sensors and Control Systems

Rinnai Diagnostics: Scale and Flow Control

Rinnai Diagnostics: No Operation on Flow

Troubleshooting when the unit does not operate after water flow activation.

Rinnai Water Heater Required Maintenance

Rinnai Annual Maintenance and Inspection

Requirements for annual inspection and maintenance by a licensed professional.

Rinnai Water Heater Cleaning Guide

Rinnai Heat Exchanger Flushing Procedure

Flushing Rinnai Heat Exchanger Guide

Step-by-step guide using vinegar to flush the heat exchanger due to scale.

Rinnai Service and Warranty Limitations

Getting Service for Rinnai Water Heater

Rinnai Warranty Exclusions

List of conditions and issues not covered by the limited warranty.

Rinnai Warranty Limitations Explained