Carrier HK06WC077 Pressure Switch

The Carrier HK06WC077 is an OEM replacement 2-stage air pressure switch designed for high-efficiency gas furnaces. This dual Hi-Lo component features two independent switches in one assembly to monitor inducer motor performance across high and low fire stages. The low-fire switch is calibrated for a 0.22" w.c. break, while the high-fire switch is rated for a 0.43" w.c. break. Manufactured by Honeywell as part number BA6838, this SPST normally open switch ensures the combustion system maintains the necessary vacuum for safe flue gas venting. It is compatible with a wide range of Carrier, Bryant, and Payne 330AAV and 331JAV series 2-stage units. As a veteran-grade HVAC furnace part, it provides reliable pressure monitoring and helps prevent ignition if the inducer RPM or venting pressure deviates from factory specifications.

• Dual-Stage Calibration: Precise set points at 0.43" and 0.22" w.c. ensure accurate sensing for both heat stages.
• Direct OEM Fit: Drop-in replacement for HK06WC077 and HK06WC082, eliminating the need for field modifications or bracket adjustments.
• Enhanced System Safety: Protects the compressor and heat exchanger by preventing operation during vent blockages or inducer failure.
• Industrial Build Quality: Constructed with durable diaphragms to handle constant cycling in high-demand residential heating applications.

• How do I know if my HK06WC077 is failing? Look for 31 or 32 flash codes on the furnace control board. If the inducer is running but the switch won't close, check for cracked tubing or a failed diaphragm within the switch housing.
• Can this switch be used in a single-stage furnace? No, this is specifically designed for 2-stage systems that require separate monitoring for low and high fire vacuum levels.
• Does orientation matter during installation? Yes, per technical guidelines, the switch should be mounted vertically with the pneumatic ports facing down to prevent moisture accumulation in the diaphragm.

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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.