Rheem-Ruud 62-23543-01 Flame Sensor

The Rheem-Ruud 62-23543-01 Flame Sensor is a critical OEM replacement component designed to maintain the safety and sequence of operation in gas-fired furnaces. This flame rectification rod features a high-grade stainless steel rod paired with a robust high-temperature ceramic insulator to handle the extreme thermal stress within the combustion chamber. When the burner ignites, the sensor generates a essential microamp signal (typically 0.5 to 10 μA) that communicates flame presence to the furnace control board. If the signal is lost or falls below the threshold, the system initiates a safety shutdown to prevent the accumulation of unburned gas.

This 90-degree offset sensor is a direct replacement for Rheem, Ruud, and WeatherKing units, including popular series such as the 80PJ, 90RJ, and R801T. It features a standard 1/4 inch male quick connect termination for a secure electrical bond. With a 2-1/2 inch probe length from the mounting flange to the tip, it ensures precise placement within the flame path for reliable rectification. Replacing a fouled or cracked sensor is a standard preventative maintenance step to resolve burner ignition failure and frequent furnace short cycling.

Key Benefits:

• Precision Flame Detection: Engineered for accurate flame rectification to ensure the control module receives a clean microamp signal during the trial-for-ignition period.
• OEM Compatibility: Specifically designed for Rheem and Ruud gas heat applications, replacing part numbers 62-23543-01, 62-23543-02, and 62-23543-03.
• Durable Construction: The stainless steel rod resists oxidation and carbon buildup, extending the intervals between manual cleanings.
• Standardized Fit: Features a pre-formed 90-degree sensor offset and integrated mounting bracket for a direct drop-in installation on inshot burner assemblies.

Common Questions:

Common symptoms include the furnace lighting for 2-5 seconds and then shutting down, or the diagnostic LED on the control board flashing a code for "low flame signal." Technicians should check for a cracked ceramic insulator or measure the microamps at the board using a multimeter in series with the sensor wire.

If the rod has carbon soot but the ceramic is intact, a light cleaning with a non-abrasive material (like a dollar bill or fine steel wool) can temporarily restore the signal. However, if the rod is pitted or the insulator is cracked, replacement is necessary to ensure reliable HVAC system operation.

Excessive moisture in the combustion air, improper burner grounding, or poor combustion chemistry can lead to rapid oxidation and soot buildup. Ensuring the furnace cabinet is properly grounded is essential for the flame rectification process to work correctly.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.