Flame Rod FL2 With Wire And Gasket

RTG20212BG Flame Rod FL2 – Flame Verification Assembly for Rheem Tankless Gas Systems

The Rheem RTG20212BG Flame Rod FL2 is a direct replacement component engineered to provide flame verification within select Rheem, Ruud, and Richmond tankless gas water heaters. This sensor works in coordination with the ignition control board to confirm flame presence through rectification, ensuring proper burner operation and immediate gas shutoff if no flame is detected.

This assembly includes the flame rod, pre-attached wire lead, and OEM-specified gasket to ensure a correct seal at the combustion interface. Proper installation of this sensor is critical for maintaining operational safety, system reliability, and compliance with flame safety protocols.

Component Function

During ignition, the RTG20212BG detects flame via ionization. If flame signal is absent or intermittent, the control board initiates lockout or retry sequences (e.g., error code 11). Flame signal strength is dependent on proper probe positioning, electrical integrity, and combustion quality. Replacement is recommended during routine service intervals or when diagnosis indicates flame sensing failure.

Technical Specifications

• OEM Part Number: RTG20212BG
• Component Type: Flame sensor with wire and gasket
• Function: Flame rectification for ignition safety circuit
• Material: High-temperature electrode, insulated lead wire, pre-cut sealing gasket
• Compatibility: Rheem, Ruud, and Richmond tankless gas water heaters (model-specific)

Installation Guidelines

Installation should be performed with gas and power disconnected. Remove the access panel and combustion chamber cover to reach the flame rod mounting port. Install the sensor with the supplied gasket to maintain a sealed combustion environment. Route and connect the lead wire to the control board terminal as specified in the unit’s service manual. Verify signal strength through onboard diagnostics after installation.

Field Application Notes

• Common Failure Indicators: Ignition lockout, flame detection errors, or intermittent burner shutdown
• Maintenance Use: Recommended for scheduled flame sensing component replacement or burner servicing
• Signal Verification: Confirm rectification signal meets manufacturer-specified microamp threshold

Features and Advantages

• OEM-Certified Fit and Function – Ensures system compatibility and reliable ignition performance
• High-Temperature Construction – Suitable for continuous combustion exposure
• Pre-Attached Lead Wire – Facilitates correct connection to control board input
• Gasket Included – Maintains chamber integrity and prevents air leaks