OEM Carrier Pressure Switch with Bracket (HK06NB124) for Model PG9MAB036040ABSA

This is the OEM factory-specified pressure switch with mounting bracket for the Carrier PG9MAB036040ABSA gas furnace. The pressure switch is a safety device that monitors the negative pressure created by the inducer motor — it must confirm that the inducer is running and the flue path is clear before allowing the ignition sequence to proceed. When it fails, the furnace will typically lock out before the igniter ever fires, often triggering a pressure switch fault code (commonly displayed as Error Code 31 on compatible Carrier and Bryant models).

• Specs: 1.81" W.C. (water column) set point | SPST (Single-Pole, Single-Throw) | Normally Open | Includes factory mounting bracket | Honeywell-manufactured OEM component
• OEM vs Generic: This OEM part is factory-calibrated to the exact pressure rating required by the PG9MAB036040ABSA. Aftermarket switches frequently drift in W.C. set point, causing nuisance lockouts or — worse — masking a true venting problem. The OEM switch also includes the correct bracket for a direct bolt-in fit.
• Install difficulty: 2/5 — Turn off power and gas before servicing. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, a phone camera to photograph tubing and wiring positions. Match the hose ports (+/−) carefully — one port contains a factory flow restrictor/orifice that must be oriented correctly.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility & Supersession: Fits Carrier model PG9MAB036040ABSA and is compatible across 200+ Carrier and Bryant residential furnace models. HK06NB124 is the current superseding part for obsolete part numbers HK06NB119, HK06NB120, HK06NB122, HK06NB123, and HK06ZB104. Verify your existing part number or furnace data plate before ordering — our team is available to confirm fitment. In stock and ships today.