A.O. Smith Cyclone BFC - 30

Questions and Answers

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paigeramirezNov 26, 2025
What does F04 error mean on A.O. Smith Water Heater?
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  Alexandra ReidNov 26, 2025
  If your A.O. Smith Water Heater shows an F04 error (three unsuccessful ignition attempts), the following could be the cause: * No gas: Open the main gas valve and/or the manual gas valve, and check the supply pressure to the gas control. If necessary, repair the gas supply. * Air in the gas pipes: Bleed the air out of the gas pipe. * No burner pressure: Check the burner pressure to the gas control and ensure the gas valves open and shut correctly. If necessary, replace the gas control. * Defect in the hot surface igniter circuit: Check the igniter connection (JP2), wiring, and resistance (2-5 ohms). Ensure it lights up during ignition; replace if necessary. * Defect in the ionization circuit: Check the flame probe connection (JP2), wiring, and measure the ionization current (min...
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Todd CoxAug 25, 2025
Why is my A.O. Smith Cyclone BFC - 30 not producing enough hot water?
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  Jason PerryAug 25, 2025
  If you're not getting enough hot water from your A.O. Smith Water Heater, or no hot water at all, consider these possibilities: * The appliance might be turned off: Start the appliance. * No supply voltage: Check the isolator, power to the isolator, the ON/OFF switch, and the power to the electrical connector block, ensuring the voltage is 230 VAC (-15%, +10%). * Hot water supply used up: Reduce hot water consumption and allow the appliance time to heat up; if the problem persists, consult your installation engineer. * Controller in OFF mode: Switch the controller to the ON mode. * Temperature set too low: Adjust the water temperature to a higher value.
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lewismichelleAug 25, 2025
What to do if I smell gas coming from my A.O. Smith Cyclone BFC - 30 Water Heater?
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  weaverisaacAug 26, 2025
  If you smell gas, it could be due to a gas leak. Immediately close the main gas valve. Do not operate any switches and ensure there are no open flames. Ventilate the area and contact your installation engineer or local gas company right away.
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idawsonAug 27, 2025
How to fix A.O. Smith Water Heater with display off?
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  Jennifer WilsonAug 27, 2025
  If the display on your A.O. Smith Water Heater is off, it could be due to several reasons: * The appliance is turned off: Start the appliance. * No supply voltage: Check the isolator, power to the isolator, the ON/OFF switch, and the power to the electrical connector block, ensuring the measured voltage is 230 VAC (-15%, +10%). If the error persists, consult your installation engineer. * Defective fuse(s): Replace the fuse(s).
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Andrew ReyesAug 28, 2025
Why does my A.O. Smith Cyclone BFC - 30 Water Heater have explosive ignition?
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  Christopher DicksonAug 28, 2025
  Explosive ignition in your A.O. Smith Water Heater can be due to: * Incorrect supply or burner pressure: Set the correct supply pressure and/or burner pressure. * Contaminated burner: Clean the burners. * Contaminated orifice: Clean the orifices.
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jasoncampbellSep 15, 2025
What does C02 error mean on A.O. Smith Cyclone BFC - 30 Water Heater?
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  watsonkathySep 15, 2025
  If your A.O. Smith Water Heater shows a C02 error (error message from the appliance controller), it could be due to: * Incorrect reference voltage from the AD converter: Reset the electronic controller. Check that the power supply frequency is compliant. If not, contact your installation engineer. If the frequency is correct but the error persists, replace the electronic controller.
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Alexander BerrySep 13, 2025
What causes F09 error on A.O. Smith Water Heater?
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  James HendersonSep 13, 2025
  If your A.O. Smith Water Heater displays error F09, indicating a water temperature safety issue, it means: * The temperature at the top of the tank exceeds 93 oC: Check that the circulation pump (if present) is working, verify the position of the temperature sensor T1, and reset the appliance controller.
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Marcus TownsendSep 14, 2025
How to fix F10 error on A.O. Smith Water Heater?
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  April HodgesSep 14, 2025
  If your A.O. Smith Water Heater displays error F10, related to ignition attempts and pressure switch states, it's likely due to: * Pressure switch not closing: Check the fan speed, ensure hoses on the pressure switch and air supply hose are correctly fitted and not cracked, verify the flue gas outlet is compliant, check for blockages in the flue gas and condensation water discharges, and measure the pressure differential across the pressure switch. Clean the heat exchanger if the pressure differential is insufficient; otherwise, check the pressure switch with a multimeter.
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Stephanie StaffordSep 6, 2025
What causes F06 error on A.O. Smith Cyclone BFC - 30?
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  christopheredwardsSep 6, 2025
  If your A.O. Smith Water Heater shows error F06 (short circuit between flame probe and earth), the problem might be: * Damaged cable in contact with metal surface: Check the wiring of the flame probe and replace it if necessary. * Broken/cracked ceramic part of the flame probe: Inspect the ceramic part of the flame probe near the burner's air distribution plate. If it's damaged, replace the flame probe.
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laura65Sep 3, 2025
What does S02 error mean on A.O. Smith Cyclone BFC - 30?
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  Matthew WheelerSep 4, 2025
  If your A.O. Smith Water Heater is showing an S02 error, indicating an open circuit in sensor 1 of temperature sensor T1, it could be due to: * Sensor not correctly connected: Connect the sensor lead to JP5. * Damaged cable or defective sensor: Replace sensor T1.

Summary

Installation Procedures

Water and Gas Connections

Electrical Connection Guide

Step-by-step instructions for connecting the appliance electrically.

Pressure & Burner Pressure Checks

Crucial steps for verifying gas pressures after installation.

Gas Category Conversion

Filling and Draining

Appliance Filling Procedures

Appliance Draining Procedures

Control Panel Operation

Error Condition Display

Details how errors are reported and interpreted on the display.

Appliance Start-up and Operation

Starting and Running the Appliance

Step-by-step guide for starting the appliance and initiating operation.

Shutting Down the Appliance

Brief Shutdown (OFF Mode)

How to activate frost protection for short-term shutdown.

Electrically Isolating the Appliance

Main Menu Navigation

Setting Water Temperature

Week Program Setup

How to program timed heating schedules for different days and times.

Service Program Functions

Displaying Error History

Setting Service Interval

Troubleshooting Common Issues

General Error Diagnosis

Distinguishes general errors from displayed errors and lists common issues.

Troubleshooting General Errors

Table listing common symptoms, causes, solutions, and remarks.

Troubleshooting Displayed Errors

Table detailing specific error codes and their resolution steps.

Maintenance Procedures

Determining Service Interval

Guidance on setting and understanding appliance service intervals.

Preparation for Maintenance

Water-Side Maintenance Tasks

Procedures for checking anodes, descaling, and cleaning the tank.

Gas-Side Maintenance Tasks

Procedures for cleaning burners, orifices, and the heat exchanger.

Finalizing Maintenance Steps