Carrier HK42FZ036 Control Board

The Carrier HK42FZ036 Control Board is a critical OEM integrated furnace control designed for high-performance management of residential and commercial heating cycles. As the central logic hub, this direct replacement circuit board coordinates the sequence of operation for the inducer motor, hot surface igniter, and blower fan while monitoring essential safety strings. Engineered for compatibility with select Carrier, Bryant, and Payne furnaces, including the 59SC2 and 912SA series, it features an onboard diagnostic LED to streamline troubleshooting on no-heat calls. This 24V 60Hz board manages automatic ignition system parameters with precision, ensuring reliable flame sensing and gas valve control. Its compact technical footprint allows for efficient installation in tight blower compartments, and the 3-amp fuse protects low-voltage components from overcurrent damage. For veteran technicians, the HK42FZ036 provides a robust solution to common failures such as stuck blower relays, inconsistent ignition timing, or intermittent error codes in high-efficiency 90% plus furnace units.

• OEM Precision: Specifically programmed for Carrier, Bryant, and Payne equipment to ensure correct blower off-delays and ignition sequences.
• Enhanced Diagnostics: Integrated LED status indicators identify faults like open limits or pressure switch failures for faster field assessment.
• Universal Compatibility: Replaces multiple factory iterations, serving as a versatile HVAC replacement part for diverse 59SC and 915SA models.
• System Protection: Includes 3-amp fuse protection to safeguard the integrated circuitry and connected 24V accessories.

• Which furnace models are compatible? This board is the standard replacement for various Carrier 59SC2, 59SC5, and 912SA series furnaces. Always verify against the wiring schematic on the blower door.
• Does this board support varying blower speeds? Yes, it features dedicated terminals for HEAT, COOL, and SPARE taps to maintain optimal airflow across different operating modes.
• Can this resolve a "blower running constantly" issue? Often, a failing relay on the original board causes the fan to run nonstop; replacing it with the HK42FZ036 restores proper logic control.

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.