Carrier LH33WZ005 Flame Sensor Assembly

The Carrier LH33WZ005 Flame Sensor Assembly is a critical safety component engineered for precision flame rectification in Carrier, Bryant, and Payne gas-fired systems. This genuine OEM flame sensor consists of a high-grade Kanthal sensor rod and a 64.5-inch lead wire, designed to withstand the high-temperature environment of the burner assembly. As a veteran technician knows, this sensor is the primary defense against hazardous unburned gas accumulation. It functions by detecting the presence of a burner flame and sending a continuous microamp signal to the integrated furnace control board. If the LH33WZ005 sensor fails to detect a flame within the designated ignition period, it immediately triggers a safety lockout to prevent fuel flow.

This HVAC flame sensor replacement is essential for resolving common "short cycling" issues where a furnace ignites but shuts down after only a few seconds. Its durable construction ensures a low-impedance path for the flame rectification circuit, maintaining a stable signal even under heavy thermal cycling. Designed for a direct drop-in fit, the LH33WZ005 cross-references across multiple residential and commercial package units, including models 48DJD012-630. Utilizing this factory-authorized part ensures your HVAC flame detection system operates within the exact manufacturer specifications for timing and sensitivity.

• Optimized Signal Accuracy: Engineered to provide a consistent microamp (µA) output, minimizing nuisance trips and furnace ignition lockouts.
• Extended Lead Wire: Includes a 64.5-inch wire for simplified routing and connection to the control module in large-cabinet configurations.
• High-Temperature Durability: The specialized alloy rod resists carbon buildup and oxidation, reducing the frequency of required cleaning.
• Broad Compatibility: Serving as the standard Carrier flame sensor assembly for an array of gas furnaces and package units.

• How do I know if my LH33WZ005 is faulty? If the furnace burners light but extinguish within 2 to 5 seconds, the sensor is likely failing to send the rectification signal. Inspect the rod for cracks in the ceramic insulator or heavy oxidation.
• Can I clean this sensor rather than replacing it? While cleaning with a non-abrasive pad can temporarily restore function, a sensor with pockmarked metal or a loose terminal should be replaced to ensure system reliability.
• Why is the 64.5" wire important? This specific length allows for versatile installation across various furnace chassis sizes without requiring manual wire splicing, which could introduce resistance into the sensitive flame sense circuit.

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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.