Ao Smith 100224098 Flame Rod Kit with Afr Function

Product Description

The AO SMITH 100224098 is a flame rod assembly with integrated AFR (air-fuel ratio) function, designed as a direct replacement component for compatible AO SMITH tankless natural gas water heaters. The flame rod serves as the primary flame-sensing element in the burner assembly, confirming ignition and signaling the control board to maintain or cut gas flow. AFR integration allows the component to assist in monitoring combustion quality, supporting safe and efficient operation. This part is installed by licensed plumbers or gas appliance technicians servicing tankless water heater systems.

This flame rod kit is intended for use in residential tankless natural gas water heater applications. It fits specific AO SMITH condensing tankless models and serves as an OEM-style replacement when the original flame sensor fails to detect flame or causes nuisance lockouts. Proper flame sensing is critical to safe burner operation, making timely replacement essential when diagnostic codes indicate sensor failure or signal loss.

Key Features

• Integrated AFR function supports air-fuel ratio monitoring during burner operation
• Direct OEM-style replacement for compatible AO SMITH tankless natural gas units
• Flame-sensing design signals the control board to confirm or interrupt gas flow
• Kit format includes components needed for complete flame rod servicing
• Designed for natural gas (NG) applications

Compatibility

Compatible with AO SMITH tankless water heater models TK-110C-NI (NG), TK-310C-NI (NG), and TK-510C-NI (NG).

Installation Notes

Installation should be performed by a licensed plumber or qualified gas appliance technician. Before servicing, shut off the gas supply and disconnect electrical power to the unit. Handle the flame rod carefully to avoid bending or contaminating the sensing element, as surface contamination can cause signal degradation. Follow all applicable local codes and the manufacturer service documentation when replacing burner assembly components.

Technical Specifications

• Product Type: Flame Rod
• Function: Flame Sensing with AFR (Air-Fuel Ratio) Integration
• Application: Replacement Part
• Fuel Type: Natural Gas (NG)

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100224098