Flame Rod FL1 With Gasket

Flame Rod FL1 (RTG20212BE) – Critical Flame-Sensing Component for Safe Burner Operation

The Rheem RTG20212BE Flame Rod FL1 is a factory-specified component used in Rheem tankless gas water heaters to confirm burner ignition and ensure safe flame monitoring during operation. This flame rod works in tandem with the control board to detect flame presence via rectification, enabling the unit to continue operation only when a stable flame is confirmed.

Loss of signal from the flame rod results in an immediate shutdown of the gas valve to prevent unburned fuel accumulation, making this a key safety and control feature in any direct-vent or non-condensing tankless system.

System Function and Placement

Installed directly in the combustion chamber, this sensor features a high-temperature probe tip that interfaces with the burner flame. The included gasket provides a tight seal against the combustion housing. Proper signal integrity from the rod is essential to avoid false no-flame error codes (e.g., error 11), nuisance shutoffs, or incomplete ignition sequences.

Specifications

• Part Number: RTG20212BE
• Sensor Type: Flame rectification probe
• Application: Flame presence detection for burner control
• Includes: OEM gasket for combustion chamber seal
• Compatibility: Rheem, Ruud, and Richmond tankless gas water heaters (model-specific)

Installation Requirements

Installation should only be performed by qualified personnel familiar with tankless gas water heater combustion systems. Disconnect gas and power before servicing. The flame rod must be properly aligned with the burner ports and securely fastened to prevent arcing or misfire. After installation, verify signal strength via diagnostic menu or control board interface. A weak or intermittent signal may indicate carbon fouling, wiring degradation, or incorrect installation depth.

Field Use and Replacement

Common symptoms requiring replacement include ignition failure, flame detection errors, and system lockouts during firing. Regular inspection is advised, especially in systems subject to scale buildup or incomplete combustion. Use only OEM parts to maintain UL certification and manufacturer warranty compliance.

Professional-Grade Features

• Precise Flame Detection – Provides real-time flame verification to enable safe burner operation
• OEM Configuration – Engineered to meet factory control tolerances for resistance and voltage signal integrity
• High-Temperature Materials – Probe withstands prolonged exposure to direct flame conditions
• Sealing Gasket Included – Maintains combustion integrity and prevents air leakage