Carrier HK42FZ031 Circuit Board 30067439-890 This includes all 66 series

This includes all 66 series (366 through 966) and 68 series (268 through 978/968V) units

making it the standard for commercial steam heating systems requiring automatic reset functionality

maintaining energy setpoints and reducing system wear

shutting down the system to prevent water from leaking onto the customer's floor or walls

Carrier HK42FZ031 Circuit Board 30067439-890 This includes all 66 seriesThe Carrier HK42FZ031 Circuit Board is a critical OEM replacement component designed for high performance furnace control and integrated system management. Engineered for precision, this furnace control board regulates essential functions including the blower motor, gas valve, and igniter sequences. As a genuine Carrier furnace part, the HK42FZ031 ensures seamless communication between system sensors and the thermostat, maintaining optimal airflow and