Carrier LH33WZ518 Flame Sensor

The Carrier LH33WZ518 Flame Sensor is a critical OEM replacement part designed for precise flame rectification in high-efficiency gas furnaces. As a veteran-grade HVAC flame sensor, this component utilizes advanced ionization technology to monitor combustion stability and provide immediate feedback to the furnace control board. Engineered for Carrier, Bryant, and Payne systems, the LH33WZ518 features a 45-degree offset with a 1/8-inch probe extension to ensure optimal positioning within the burner's flame envelope. This gas furnace flame sensor is built with high-temperature resistant materials to withstand the rigorous heat cycling of modern condensing furnaces. Rapid detection of flame signal prevents ignition lockouts and unsafe gas accumulation, maintaining system uptime and protecting the heat exchanger. For service contractors, this genuine replacement flame sensor offers a direct-fit solution, resolving status code 22 or abnormal flame-proving signal errors without the need for field modifications or bracket adjustments.

• Precision Flame Rectification: Utilizes a high-sensitivity probe to ensure the burner remains lit, preventing nuisance furnace short cycling.
• Broad OEM Compatibility: Engineered for seamless integration with Carrier 58MEC, PG9MXA, and various System 1 modulating furnaces.
• Enhanced Safety: Immediately signals a gas valve shutdown if flame presence is lost, mitigating the risk of hazardous unburned gas buildup.
• Service Strength Construction: Robust probe design resists carbon buildup and oxidation better than generic aftermarket alternatives.
• Contractor-Ready Install: Features a standard 1/4-inch spade connector and factory-aligned bracket for fast local furnace repair.

What furnace error codes indicate a need for the LH33WZ518?
On most Carrier units, a Status Code 22 (Abnormal Flame-Proving Signal) or Status Code 14 (Ignition Lockout) typically suggests the sensor is dirty, oxidized, or has failed. If the furnace fires for several seconds and then shuts down, the flame sensor is the primary suspect.

Can I clean the Carrier LH33WZ518 instead of replacing it?
While cleaning with a very fine abrasive (like a Scotch-Brite pad) can temporarily restore a microamp signal, oxidation and microscopic pits in the metal eventually lead to signal degradation. For long-term reliability and to prevent callbacks, professional technicians recommend a full OEM flame sensor replacement.

Will this sensor fit my specific furnace model?
The LH33WZ518 is a versatile HVAC part compatible with numerous gas-fired appliances, including Carrier, Bryant, and Payne models. Always verify the model number on your furnace's rating plate; this sensor is a direct replacement for many older LH33WZ series probes.

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.