OEM Carrier Pressure Switch with Bracket (HK06NB124) for Model PG9MAA036040AEKA

This OEM pressure switch with bracket is the factory-specified replacement for the Carrier PG9MAA036040AEKA gas furnace. The pressure switch is a safety device that monitors negative pressure created by the draft inducer motor, confirming proper venting before allowing the ignition sequence to proceed. When this switch fails or becomes sluggish, the furnace will lock out on a pressure fault — typically indicated by a flashing error code — before it ever reaches ignition. Common symptoms include a furnace that starts the inducer but never advances to heat, or one that intermittently locks out on windy days or as the switch diaphragm ages.

• Specs: 1.81" W.C. (water column) set point | SPST (Single-Pole, Single-Throw) | Includes factory mounting bracket | OEM part number HK06NB124 | Supersedes HK06NB120, HK06NB119, and HK06NB122
• OEM vs Generic: This is a genuine Carrier OEM switch, factory-calibrated to the exact set point for your PG9MAA036040AEKA. Aftermarket switches often use looser tolerance diaphragms that can cause nuisance lockouts or, worse, fail to open on a true venting fault — a safety risk not worth taking on a gas appliance.
• Install Difficulty: 2/5 — Disconnect power and gas before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, needle-nose pliers. Photograph all hose and wiring connections before removal. The included mounting bracket makes direct bolt-in replacement straightforward.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG9MAA036040AEKA gas furnace. This switch is also used as the replacement across 200+ Carrier and Bryant residential furnace models — always confirm the W.C. rating on your existing switch or unit data plate before ordering. Our technical team is available to verify fitment prior to purchase.