OEM Carrier Pressure Switch w/ Bracket 1.81" WC for Model PG9MAA048080AEKA — HK06NB124

This is the OEM factory-specified pressure switch with mounting bracket for the Carrier PG9MAA048080AEKA gas furnace. The pressure switch monitors negative pressure created by the draft inducer motor to confirm safe flue venting before allowing the ignition sequence to proceed. When the switch fails or becomes stuck open, the furnace control board detects the fault and locks out the heating cycle — typically triggering an error code before the burners ever light. Symptoms include a furnace that runs the inducer but never advances to ignition, repeated short-cycling, or a blinking fault code indicating a pressure switch failure.

• Specs: 1.81" W.C. (water column) set point | SPST (Single-Pole, Single-Throw) | Normally Open | Includes factory mounting bracket | Manufactured by Honeywell for Carrier
• OEM vs Generic: This OEM unit is factory-calibrated to the exact 1.81" W.C. trip point required by the PG9MAA048080AEKA. Generic pressure switches frequently carry wider tolerances that can cause nuisance lockouts or, worse, allow the furnace to fire under unsafe venting conditions.
• Install difficulty: 2/5 — Power down and disconnect the furnace before starting. Tools needed: Phillips screwdriver, 1/4" nut driver, needle-nose pliers. Photograph all hose and wire connections before removal. Note port orientation carefully — ports are labeled and one may contain a flow restrictor; match to the original before reconnecting hoses.
• Warranty: 1-year OEM manufacturer warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier PG9MAA048080AEKA gas furnaces. This part also supersedes and replaces obsolete part numbers HK06NB119, HK06NB120, HK06NB122, and HK06NB123 across over 200 Carrier and Bryant residential furnace models. Confirm your unit's existing water column rating on the data plate or old switch body before ordering. Need fitment verification? Our team is standing by.