Rheem-Ruud 62-23543-05 Flame Sensor

The Rheem-Ruud 62-23543-05 Flame Sensor is a critical safety component designed for precise rectification in residential and commercial gas furnaces. This OEM replacement part utilizes a high-grade Kanthal sensor rod capable of withstanding the intense thermal stress of a furnace burner assembly environment. When the gas valve opens, this sensor detects the presence of a flame via ionization, sending a microamp signal back to the integrated furnace control board. If the furnace flame sensor fails to detect a consistent flame signal, it triggers a safety lockout to prevent the accumulation of unburned gas. This specific model features a 90-degree offset and a 1/4-inch male spade terminal for secure electrical connections. It is a direct fit for numerous Rheem, Ruud, and WeatherKing units, ensuring reliable HVAC troubleshooting and consistent ignition cycles during high-demand heating periods.

Key Technical Benefits

• Optimized Signal Continuity: Engineered to provide a stable microamp reading to the ignition control module, reducing nuisance trial-for-ignition failures.
• High-Temperature Durability: The ceramic insulator and specialized metal rod are rated for continuous exposure to high-BTU burner flames without premature oxidation.
• OEM Compatibility: Facilitates a direct "drop-in" gas furnace repair, maintaining the original equipment manufacturer's safety specifications.
• Surface Area Efficiency: The rod geometry is calibrated for maximum flame contact, ensuring rapid detection and thermal response times.

Common Installation Questions

How do I test a Rheem 62-23543-05 flame sensor?
Set your multimeter to the DC microamp (µA) scale. Connect the meter in series between the sensor terminal and the control board wire. A healthy sensor typically reads between 2.0 to 6.0 µA depending on the specific furnace control board requirements.

What causes a flame sensor to fail?
Carbon buildup or "sooting" on the rod is the most common issue. While cleaning can provide a temporary fix, microscopic pitting in the metal surface often necessitates a full replacement to restore reliable HVAC system operation.

Is this sensor compatible with all Rheem gas furnaces?
While the 62-23543-05 is a widely used Rheem replacement part, always verify the specific part number found in your unit's service manual or on the existing sensor bracket to ensure correct offset and lead length.

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.