A.O. Smith BFC-28 - User Manual

Questions and Answers

T
Tiffany CooleyAug 16, 2025
Why is my A.O. Smith Water Heater not producing enough hot water?
- T
  Tim ByrdAug 16, 2025
  If your A.O. Smith Water Heater isn't producing enough or any hot water, consider the following: * Ensure the water heater is turned on. * Verify the isolator is on and receiving power, the controller's ON/OFF switch is in the 'I' position, and the electrical connector block is powered, with a measured voltage of 230 VAC (-15%, +10%). * Reduce hot water usage and allow the water heater time to reheat. * Make sure the controller is in the ON position. * Increase the temperature setting.
M
Michael CastroAug 18, 2025
What to do if my A.O. Smith Water Heater is leaking water?
- B
  Barbara WareAug 18, 2025
  If you notice water leaking from your A.O. Smith Water Heater: * Tighten any loose threaded water connections. * Ensure the condensation water discharge is functioning correctly. * Identify the source of the leak, as it may originate from another water heater or pipe segment nearby. * If the leak comes from the water heater tank itself, consult the supplier or manufacturer.
J
Jessica CooperAug 22, 2025
What to do if I smell gas from my A.O. Smith Water Heater?
- D
  Debbie DunnAug 22, 2025
  If you smell gas, immediately close the main gas valve, do not operate any switches or use open flames, ventilate the boiler room, and contact your installation engineer or local gas company.
S
Steven WeberAug 25, 2025
Why is the display off on my A.O. Smith Water Heater?
- K
  Kathryn RuizAug 25, 2025
  If the display on your A.O. Smith Water Heater is off: * Ensure the water heater is turned on. * Check the isolator is ON and has power, the controller's ON/OFF switch is in position I, and the electrical connector block has power, ensuring the voltage is 230 VAC (-15%, +10%). * If there are defective fuses, contact your installation engineer to replace them.
S
Sara ButlerAug 27, 2025
What causes explosive ignition in A.O. Smith Water Heater?
- H
  hernandezjaimeAug 27, 2025
  Explosive ignition in your A.O. Smith Water Heater can be due to incorrect supply pressure or CO2 levels, which should be set correctly. Another cause can be a contaminated burner, which should be cleaned.
J
Jessica HernandezAug 30, 2025
How to fix A.O. Smith Water Heater S01 error?
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  barbara17Aug 31, 2025
  If your A.O. Smith Water Heater shows an S01 error (blocking error) indicating an open circuit from temperature sensor T2, it could be due to the sensor not being correctly connected, in which case you should connect the sensor lead to JP3. Alternatively, the cable or sensor may be damaged, requiring replacement.
P
Peter AndersonSep 2, 2025
How to troubleshoot A.O. Smith Water Heater S02 error?
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  Jacob BentleySep 3, 2025
  If your A.O. Smith Water Heater displays an S02 error (blocking error) indicating an open circuit from sensor 1 of temperature sensor T1, it might be due to the sensor not being properly connected; ensure the sensor lead is connected to JP5. It could also be caused by a damaged cable or a defective sensor, which would need to be replaced.
M
Melinda ClarkSep 6, 2025
What does S03 error mean on A.O. Smith Water Heater?
- B
  Brian KelleySep 6, 2025
  If your A.O. Smith Water Heater shows an S03 error (blocking error) indicating an open circuit in sensor 2 of temperature sensor T1, it may be because the sensor is not correctly connected; connect the sensor lead to JP5. Another possibility is a damaged cable or defective sensor, which would require replacement.
K
Kristi McintoshSep 9, 2025
What to do for A.O. Smith Water Heater S04 error?
- B
  Brittany SmithSep 9, 2025
  If your A.O. Smith Water Heater displays an S04 error (blocking error) indicating an open circuit from dummy 1, it may be caused by the dummy not being correctly connected; connect the dummy sensor leads to JP4. Alternatively, the dummy sensor might be defective and need replacement.
A
Allison GonzalezSep 12, 2025
How do I fix A.O. Smith Water Heater S05 error?
- M
  Michael BrownSep 12, 2025
  If your A.O. Smith Water Heater shows an S05 error (blocking error) indicating an open circuit from dummy 2, it could be that the dummy is not correctly connected; connect the dummy sensor leads to JP4. It's also possible that the dummy sensor is defective and needs to be replaced.

Summary

Introduction to BFC Water Heater

About the BFC Water Heater

Provides general information about the BFC water heater and its features.

Gas Leak Safety Procedures

Critical safety instructions for responding to gas leaks.

Regulatory Installation Requirements

Outlines legal and regulatory requirements for installation.

Maintenance Importance and Schedule

Details the importance and frequency of regular maintenance.

BFC Water Heater Working Principles

General Working Principle of the Water Heater

Explains the fundamental operational mechanism of the appliance.

Water Heater Protection Features

Describes safety features and mechanisms protecting the water heater.

Installation Safety Considerations

Covers essential safety considerations for a correct and safe installation.

BFC Water Heater Installation Guide

Ambient Installation Requirements

Specifies the required environmental conditions for proper installation and operation.

Technical Specifications Overview

Lists detailed technical data, dimensions, and specifications for installation.

Installation Connection Diagram

Provides a visual representation of the water heater's connections and layout.

Gas Connection Procedure

Details the procedure and safety requirements for connecting the gas supply.

Air Supply and Flue Gas Discharge

Explains requirements for air intake and safe exhaust of combustion gases.

Electrical Connection Guide

Outlines the process for safely connecting the water heater to the electrical power supply.

Post-Installation System Checks

Describes crucial checks after installation for correct performance and safety.

Gas Category Conversion Process

Conversion Process Introduction

Explains the process and necessity of converting the appliance for different gas types.

Filling the Water Heater

Filling Unvented Installations

Step-by-step guide for filling unvented water heater installations.

Filling Vented Installations

Step-by-step guide for filling vented water heater installations.

Draining the Water Heater

Draining Unvented Installations

Procedure for draining unvented water heater installations for service.

Draining Vented Installations

Procedure for draining vented water heater installations for service.

Control Panel Operation and Navigation

Control Panel Overview

Overview of the control panel's components and interface.

Understanding Control Panel Icons

Explains the meaning of graphical symbols displayed on the control panel.

Navigation Button Functions

Details how to use the buttons to navigate the control panel menus.

Water Heater Status Indicators

Understanding Operating Modes

Describes the different operating states of the water heater.

Error Condition Codes and Descriptions

Lists potential error codes and their brief descriptions.

Service Required Notifications

Explains messages indicating the need for service or maintenance.

Anode Protection Warnings

Alerts users to issues with the anode protection system.

Starting the Water Heater Operation

Appliance Startup Procedure

Step-by-step instructions for initiating the water heater's operation.

Heating Cycle Explanation

Details the sequence of operations during the water heater's heating process.

Shutting Down and Isolating the Water Heater

Isolating from Mains Power

Procedure for safely disconnecting the water heater from the electrical supply.

Main Menu Operations and Settings

Switching to ON Mode

How to activate the primary operating mode for hot water demand.

Setting Water Temperature

Guide for adjusting the desired water temperature setting.

Week Program Scheduling

Instructions for setting up timed heating schedules for convenience.

Service Program Functions

Error History Display

Accesses a log of past error messages for troubleshooting.

Setting Service Interval

Configures reminders for scheduled maintenance.

Service Mode Operations

Enables access to technical adjustments and diagnostics for engineers.

Legionella Prevention Settings

Specific settings to prevent legionella bacteria growth.

Troubleshooting Errors and Warnings

General Error Troubleshooting Guide

Provides solutions for common issues not shown on the display.

Displayed Error Code Troubleshooting

Offers guidance for resolving specific error codes shown on the display.

Understanding Display Warnings

Explains warning messages and their significance.

Service Interval Management

Determining the Correct Service Interval

Guidance on how to set or determine the appropriate maintenance frequency.

Performing Maintenance Tasks

Maintenance Preparation Steps

Steps to safely prepare the water heater for maintenance procedures.

Water-Side Maintenance Procedures

Procedures for cleaning and maintaining the water-related components.

Gas-Side Maintenance Procedures

Procedures for cleaning and maintaining the gas-related components.

Finalizing Maintenance Steps

Steps to complete after performing maintenance tasks.

Warranty Information and Conditions

Warranty Conditions for Installation and Use

Outlines the terms and conditions necessary to maintain warranty validity.

Warranty Exclusions Explained

Lists situations and factors that are not covered by the warranty.

Appendices and Diagrams

Electrical Diagram Details

Detailed wiring diagram for the water heater.

A.O. Smith BFC-28 Specifications

General

Brand	A.O. Smith
Model	BFC-28
Category	Water Heater
Language	English

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