Carrier LH33CM018 Flame Sensor

Maintain peak combustion safety with the Carrier LH33CM018 Flame Sensor. This OEM flame sensing probe is engineered for precision in Carrier, Bryant, and Payne gas furnaces utilizing spark ignition systems. As a critical safety component, it monitors for the presence of a gas burner flame through the process of flame rectification, ensuring the integrated circuit board maintains gas flow only when ignition is confirmed. Constructed with a high-temperature resistant metallic rod and a robust porcelain insulator, this replacement flame sensor is built to withstand the extreme thermal cycles of residential and light commercial heating environments.

Installation of the Carrier furnace flame sensor LH33CM018 directly addresses common furnace short cycling issues and ignition failure error codes caused by carbon buildup or oxidation on the sensing rod. Its 1/2-inch connection and standard electrical terminals allow for a seamless swap-out during preventative maintenance or emergency service calls. By delivering a reliable microamp signal back to the furnace control board, this sensor prevents hazardous unburned gas accumulation, ensuring the heating system operates within factory-specified safety tolerances.

• Direct OEM Replacement: Fully compatible with a wide range of Carrier, Bryant, and Payne gas-fired heating systems.
• Enhanced Safety: Immediately signals the control board to terminate gas flow if the flame is lost, preventing hazardous accumulation.
• Durable Construction: Engineered with high-grade materials to resist corrosion and thermal stress in high-efficiency burners.
• Improved System Reliability: Resolves intermittent "no heat" calls and burner lockout scenarios often caused by worn or fouled sensors.
• Universal Application: Designed specifically for use with spark igniter configurations in residential and light commercial units.

• How do I know if the LH33CM018 flame sensor is faulty? Usually, the furnace will ignite for a few seconds and then shut down. You may also see fault codes on the control board indicating a limit or flame sensing error.
• Can this sensor be cleaned instead of replaced? While light oxidation can be removed with a fine abrasive pad, cracks in the porcelain or severe pitting on the metal rod require a complete flame sensor replacement to maintain safety.
• Will this work with hot surface igniters? This specific model is optimized for systems using spark ignition; always verify your specific furnace model number before installation.

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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.