OEM Carrier Pressure Switch with Bracket (HK06NB124) for Model PG9MAB036040LBSA

This OEM pressure switch with mounting bracket is the factory-specified replacement for the Carrier PG9MAB036040LBSA gas furnace. The pressure switch proves that the draft inducer motor has created sufficient negative pressure in the flue before allowing the ignition sequence to proceed — a critical safety interlock. When it fails or its diaphragm weakens, the furnace control board detects an open pressure switch circuit and locks out the ignition sequence entirely, leaving you with no heat. Typical symptoms include a fault code indicating a pressure switch failure (often error code 31 on Carrier/Bryant systems), the inducer running continuously with no ignition, or short-cycling immediately after startup.

• Specs: 1.81" WC (water column) rating | SPST (Single-Pole, Single-Throw) | Normally Open | Includes factory mounting bracket | Honeywell-manufactured OEM component
• OEM vs Generic: This is the genuine Carrier OEM part (HK06NB124), manufactured to exact factory diaphragm tension and WC tolerances. Generic aftermarket switches often carry wider WC tolerance bands, which can cause nuisance lockouts or — worse — fail to prove proper draft, creating a safety risk.
• Install difficulty: 2/5 — Disconnect power and gas before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, needle-nose pliers, manometer (to verify WC after install). Photograph all hose and wiring connections before removal. Note: HK06NB124 supersedes HK06NB120, HK06NB119, HK06NB122, and HK06NB123 — port orientation may differ from the original; match hose routing to the +/− port labels on the new switch.
• Warranty: 1-year OEM manufacturer warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Factory-matched for the Carrier PG9MAB036040LBSA gas furnace. Also the current superseding replacement for part numbers HK06NB119, HK06NB120, HK06NB122, and HK06NB123 across over 200 Carrier and Bryant residential furnace models. Always verify your unit's data plate and existing WC rating before ordering. Our team is available to confirm fitment — just reach out before you buy.