Robertshaw 10-681 Flame Sensor

The Robertshaw 10-681 Flame Sensor is a high-sensitivity monitoring component engineered for precise flame rectification in residential and commercial gas-fired systems. Explicitly manufactured to replace Carrier LH33WZ511 and LH680014, this remote sensor provides critical feedback to the ignition control board to prevent hazardous unburned gas accumulation. Designed for seamless integration, it is the direct Carrier furnace flame sensor replacement for equipment utilizing the 41-409 hot surface ignitor.

This sensor features a 30-inch Teflon-insulated lead wire rated for temperatures up to 482°F (250°C), ensuring long-term signal integrity within the high-heat environment of the burner assembly. The high-quality ceramic insulator and oxidation-resistant flame rod are built to withstand standard combustion cycles without premature carbon fouling. As a technical HVAC part, the 10-681 is indispensable for troubleshooting "no flame" or "short cycle" lockout codes in Carrier, Bryant, and Payne units, maintaining the electrical circuit required for safe, continuous pilot or main burner operation.

• Exact OEM Cross-Reference: Identical performance specifications to Carrier LH33WZ511, ensuring zero-modification installs.
• Extended Service Range: Equipped with a 30-inch Teflon lead for versatile routing and protection against thermal degradation.
• System Compatibility: Optimally tuned for systems using 41-409 ignitors, providing stable microamp readings to the control module.
• Industrial Grade Materials: Features a high-alumina ceramic insulator to prevent electrical leakage and ground faults.

How do I verify if the 10-681 is the correct sensor?
This part is the designated replacement for Carrier/BDP part numbers LH33WZ511 and LH680014. If your furnace uses a 41-409 hot surface ignitor, this sensor is technically compatible.

What are the symptoms of a failing flame sensor?
Typical failure signs include the burner igniting and then shutting down within seconds (short-cycling) or the control board displaying a specific "Flame Sense" error code.

Can the rod be cleaned during maintenance?
While light oxidation can sometimes be removed with a non-abrasive pad, the ceramic insulator on the 10-681 is prone to hairline fractures over time, necessitating a full replacement for reliable safety circuit performance.

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.