Carrier LH33WZ015 Flame Sensor

The Carrier LH33WZ015 Flame Sensor is a critical OEM replacement part designed for precision flame rectification in high-efficiency gas furnaces. This genuine furnace flame sensor features a high-temperature Kanthal flame rod capable of withstanding extreme combustion environments up to 1800°F. As a vital safety component, it monitors the burner’s ignition status, sending a microamp signal to the furnace control board to maintain the gas valve opening. If continuity is lost due to soot accumulation or electrode degradation, the system will initiate an ignition lockout to prevent hazardous gas buildup.

This Carrier flame sensor is engineered for a broad range of Carrier, Bryant, and Payne models, including the 340MAV, 350MAV, 58MXA, and 58MVP series. It features a 3-inch element length and a 54-inch lead wire, ensuring flexible HVAC part compatibility for both standard and remote mounting applications. For service technicians troubleshooting Carrier error code 34 or short-cycling issues, installing a new LH33WZ015 sensor is the standard protocol to restore reliable system performance and prevent nuisance shutdowns during heavy heating cycles.

• Direct OEM Fit: Ensures seamless integration with the factory wiring harness and mounting bracket without field modification.
• High-Grade Alumina Ceramic Insulator: Prevents electrical grounding and signal interference, ensuring accurate flame detection.
• Durable Kanthal Rod: Specifically built to resist oxidation and thermal fatigue, reducing the frequency of service calls for cleaning.
• Enhanced Safety: Facilitates immediate gas shut-off if a flame failure is detected, protecting the heat exchanger and the property.

How do I troubleshoot a suspected faulty LH33WZ015 sensor?
Technicians should first measure the microamp (µA) signal in series with the sensor lead while the burner is active; a reading below 1.0 µA typically indicates a dirty or failing flame sensor electrode.

Will this sensor resolve a Carrier Error Code 34 lockout?
Yes, indicator code 34 (Ignition Proving Failure) is frequently caused by a cracked or heavily fouled sensor that can no longer prove flame to the furnace control board.

Is the 54-inch lead wire required for all installations?
The extended 54-inch lead provides the necessary reach for various cabinet configurations, though the wire should be secured away from hot surfaces and moving parts like the inducer motor.

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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.