Carrier LH33WZ003 Flame Sensor Electrode

The Carrier LH33WZ003 Flame Sensor Electrode is a critical diagnostic and safety component designed for precise rectification in Carrier, Bryant, and Payne gas-fired furnaces. This HVAC flame sensor replacement utilizes a high-grade Kanthal metal rod to withstand the intense thermal stress of the burner assembly while maintaining consistent microamp signals to the integrated furnace control (IFC). When performing a furnace flame sensor cleaning or troubleshooting ignition lockout codes, replacing a fouled or oxidized electrode ensures the HVAC flame rectification process remains uninterrupted, preventing nuisance shutdowns. This OEM Carrier furnace part is engineered for exact fitment, featuring a ceramic insulator that prevents high-voltage leakage to the ground. Technical specifications confirm compatibility with various gas furnace ignition systems, providing a direct solution for flame sensor 3-flash codes. Professional installation is recommended to ensure the electrode is positioned correctly within the burner flame path for optimal conductivity and system reliability.

• Optimized Conductivity: High-temperature metal alloy ensures stable microamp feedback to the control board.
• Direct OEM Fit: Drop-in replacement for Carrier LH33WZ003 eliminates the need for field modifications.
• System Reliability: Prevents premature inducer motor wear and unnecessary cycling caused by intermittent signal loss.
• High-Grade Insulation: Heavy-duty ceramic prevents short-circuiting during the ignition sequence.

How do I test the Carrier LH33WZ003 signal?
Set your multimeter to the DC microamps (µA) scale and wire it in series with the sensor lead. A healthy signal typically ranges between 2.0 and 6.0 µA depending on the specific furnace control board.

Can I clean this electrode instead of replacing it?
While light oxidation can be removed with a non-conductive abrasive pad, significant pitting or cracks in the ceramic insulator require a full replacement to ensure safe furnace operation.

What causes this flame sensor to fail?
Common failure points include carbon buildup, high humidity causing ceramic fractures, or silica contamination from nearby construction, all of which disrupt the rectification process.

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.