Lennox 46K67 Control Board

The Lennox 46K67 Defrost Control Board is a critical OEM replacement component engineered for precision management of heat pump defrost cycles. As a veteran technician knows, the Lennox R47181-001 (also marketed under the Armstrong Air 46K67 part number) is essential for maintaining system efficiency by intelligently monitoring temperature sensors and time parameters. This HVAC defrost control module initiates and terminates defrost routines to prevent frost accumulation on outdoor coils, protecting the compressor from liquid slugging and ensuring optimal heat transfer during low-ambient operation. Compatible with 10CHP024 through 10CHP060 models, this factory-grade board effectively manages relays to toggle between heating and cooling modes. For systems lacking a high-pressure switch, a jumper (not included) must be applied to the pressure input terminals. This OEM Lennox 46K67 ensures a direct-fit integration, maintaining the rigorous performance standards required for professional heat pump maintenance and repair.

• Intelligent Defrost Logic: Optimizes cycle timing based on real-time sensor data to maximize energy efficiency.
• Universal OEM Compatibility: Serves as a direct replacement for Lennox 46K67 and Armstrong 46K67 in various residential heat pump configurations.
• Robust Environmental Protection: Rugged construction designed to withstand extreme fluctuations in temperature and humidity common in outdoor units.
• Streamlined Installation: Features a factory-standard layout with clear terminal markings for efficient field replacement.

How do I know if my 46K67 defrost board is failing?
Common indicators include the outdoor coil completely icing over, the unit failing to switch out of defrost mode, or the compressor not engaging during heating cycles. Checking for diagnostic LED codes on the 46K67 control board can help isolate sensor issues from board failure.

Is the Lennox 46K67 board compatible with R-410A systems?
Yes, this defrost control board is designed for use in both R-22 and R-410A Lennox and Armstrong heat pumps, provided the model number matches the manufacturer’s specifications.

Do I need to install a jumper on the high-pressure terminals?
If your specific heat pump model does not utilize a high-pressure switch, a jumper must be installed across the high-pressure input pins on the 46K67 board to allow the system to operate.

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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.