Lennox Y4152 HSI Kit

The Lennox Y4152 HSI Kit is a field-proven integrated furnace control board upgrade designed for technical precision in two-stage heating systems. Specifically engineered to manage Lennox variable speed (ECM) blower motors, this kit provides a direct drop-in replacement for legacy White-Rodgers and OEM units. As a veteran-grade HVAC replacement part, the Y4152—which is functionally identical to the Y415201—standardizes high-efficiency performance by integrating hot surface ignition logic with advanced ECM airflow management. This ensures consistent flame rectification and eliminates the rapid cycling often seen in deteriorating control circuits. The silicon nitride ignitor included in this package is built for high-demand residential and commercial duty, resisting the thermal shock that typically compromises standard carbide components. By utilizing the Lennox Y4152, contractors can resolve furnace ignition failure and intermittent ECM motor communication issues, restoring the unit's ability to transition smoothly between low and high heat stages while maintaining peak static pressure efficiency.

• Universal Compatibility: Replaces a wide range of Lennox and Armstrong part numbers, including 50V51-843, 18M9901, and 49M5901, simplifying truck stock.
• Variable Speed Control: Optimized specifically for ECM blower motor configurations to maintain precise CFM across various duct static pressures.
• Enhanced Ignition Reliability: Features a durable silicon nitride HSI that offers a more robust service life than traditional silicon carbide ignitors.
• Diagnostic accuracy: Includes onboard LED troubleshooting indicators to quickly identify flash codes related to flame sense or limit switch trips.

• Is the Y4152 compatible with single-stage units? No, this kit is specifically built for two-stage furnaces with variable speed ECM motors. Using it on single-stage induction motors will lead to improper sequence of operation.
• Can I use a universal ignitor with this board? While the board supports 120V HSI, it is highly recommended to use the included Lennox HSI kit components to ensure the correct resistance profile for the integrated flame sensing circuit.
• What does an alternating slow flash indicate? On this integrated furnace control, alternating slow flashes typically point to a flame failure or gas valve issue. Check manifold pressure and clean the flame sensor as a first step in Lennox furnace troubleshooting.

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.