Lennox 56K85 Control Board 321702-401 Space-Efficient Design: Compact frame size

Space-Efficient Design: Compact frame size allows for high-density mounting in electrical enclosures

or sluggish response times during pressure changes

Precision Thermal Monitoring: Utilizes a high-accuracy 10K Ohm thermistor to provide real-time temperature feedback for precise system regulation

This model features a 1-1/8 inch ODF solder connection and a 9/16 inch port diameter

supporting consistent indoor climate control and system efficiency

Lennox 56K85 Control Board 321702-401 Space-Efficient Design: Compact frame sizeThe Lennox 56K85 is a critical Integrated Modular Control (IMC) board designed specifically for managing the secondary gas valve in multi stage heating systems. This OEM Lennox replacement board (part number 56K85) serves as the Gas Vlv #2 control module, ensuring precise sequencing and timing for combustion cycles in heavy duty commercial rooftop units and high capacity furnaces. Built to withstand the thermal stresses of the cabinet environment, the