Carrier HK06NB017 Pressure Switch

The Carrier HK06NB017 is a critical OEM dual pressure switch assembly designed specifically for two-stage high-efficiency condensing furnaces. This Honeywell-manufactured component features two distinct calibrated setpoints: a low-pressure circuit at 0.71" wc and a high-pressure range of 1.60" - 1.81" wc. This configuration allows the furnace control board to verify proper venting and inducer motor performance across both low and high-fire heating cycles. A precision diaphragm monitors the negative pressure created by the draft inducer, ensuring that combustion gases are safely exhausted before the ignition sequence begins.

Constructed from high-grade polycarbonate with a normally closed contact configuration, the HK06NB017 pressure switch is built to withstand the humid conditions typical of 90%+ AFUE systems. If you are diagnosing a furnace pressure switch failure, verify that the vacuum tubing is clear of moisture or debris and that the collector box ports are not obstructed. This furnace replacement part is a direct substitute for Honeywell BA20203 and is essential for maintaining the safety logic of Carrier and Bryant 355BAV and 58UVB series units.

• OEM Compatibility: Exact replacement for Carrier, Bryant, and Payne two-stage furnaces, ensuring seamless integration with the factory control board.
• Dual-Stage Monitoring: Precisely calibrated at 0.71" wc and 1.60"-1.81" wc to manage variable airflow requirements.
• Robust Design: Engineered to handle high-temperature environments and potential condensate exposure without diaphragm premature fatigue.
• System Safety: Prevents gas valve energization if the venting system is restricted or the inducer motor fails to pull the required vacuum.

How can I tell if my pressure switch is causing a lockout?
Check the diagnostic LED on your furnace control board. A specific flash code usually indicates a "Pressure Switch Did Not Close" or "Pressure Switch Stuck Open" error. If the inducer runs but the igniter never glows, use a manometer to verify the actual vacuum matches the HK06NB017 specs.

Can I use a single-stage switch to replace this dual switch?
No. Two-stage furnaces require both the 0.71" and 1.60"-1.81" setpoints to operate safely in both low and high-heat modes. Using a single-stage switch will cause the system to fail during stage transitions.

What causes these switches to fail most often?
While the switch itself is durable, failures are often caused by water in the sensing lines, a cracked diaphragm, or clogged ports in the collector box that prevent the switch from "proving" the inducer's draft.

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.