Carrier HK06NB124 Pressure Switch

When you're dealing with a furnace that won't initiate its ignition sequence, the Carrier HK06NB124 Pressure Switch is often the first component to inspect. This is a Genuine OEM Carrier Replacement Part designed for high-efficiency condensing furnaces. As a Single-Pole Single-Throw (SPST) switch, it serves as a critical safety interlock, ensuring the inducer motor is pulling a sufficient draft before allowing the gas valve to open. This specific model features a factory-calibrated set point of -1.65" WC (water column), though some applications may refer to its secondary 1.81" WC rating depending on the specific bracket and furnace configuration.

The HK06NB124 is engineered for a precise "drop-in" fit, making it a reliable choice for Carrier, Bryant, and Payne units. It is the direct superseding replacement for several older or discontinued part numbers, including HK06NB119, HK06NB120, HK06NB122, HK06NB123, HK06ZB104, and FS6076A-1862. Its durable construction is built to withstand the moist, acidic environment of a 90%+ AFUE furnace's collector box or inducer housing. Using this Factory Authorized Part preserves the original engineering specifications of the HVAC Combustion Safety Switch, ensuring proper furnace pressure switch troubleshooting and long-term system reliability.

• Exact Compatibility: Replaces HK06NB119 and HK06NB120 without needing to modify mounting holes or hose orientations.
• Reliable Safety Monitoring: Maintains the exact -1.65" wc pressure switch trip point required for safe combustion.
• Wide Model Support: Validated for use in hundreds of Carrier furnace models, including popular 58MCA and 340MAV series.
• OEM Build Quality: Features a rugged diaphragm and corrosion-resistant contacts to prevent premature failure.

What are the symptoms of a failing HK06NB124 switch?
The most common sign is the inducer motor running continuously while the igniter fails to glow, often accompanied by a pressure switch stuck open fault code on the furnace control board.

Can I use an adjustable universal switch instead?
While universal switches exist, they lack the precise calibration of an OEM Carrier HK06NB124. Using the HK06NB124 furnace part ensures the system operates within the manufacturer's narrow safety tolerances.

Why did my original pressure switch fail?
Failures are often caused by diaphragm fatigue or water backup in the inducer housing. Always check for blocked condensate drains or venting obstructions when replacing this component.

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.