OEM Carrier Furnace Pressure Switch 1.81" WC SPST — HK06NB123 for Model PG9MAA060080AFKA

This OEM-spec pressure switch is the factory-matched replacement for the Carrier PG9MAA060080AFKA gas furnace. The pressure switch is a critical safety interlock that monitors the draft inducer motor's airflow before allowing the ignition sequence to proceed. When the inducer creates adequate negative pressure, the switch closes and signals the control board to continue. A failed pressure switch causes the furnace to lock out before ignition — typically displaying a fault code and leaving you with no heat. Common failure symptoms include the inducer running but the furnace never advancing to spark, or intermittent heating that stops after the first cycle.

• Specs: 1.81" WC (inches water column) setpoint | SPST (single-pole, single-throw) switching | Standard hose port and spade terminal connections | Factory-matched trip point for accurate draft proving
• OEM vs Generic: OEM pressure switches are factory-calibrated to the exact water column rating required by this furnace model. Generic alternatives may carry wider tolerances, risking nuisance lockouts or — more critically — failing to detect genuine draft deficiencies.
• Install difficulty: 2/5 — Shut off power and gas before servicing. Tools needed: flathead screwdriver, needle-nose pliers, multimeter (to verify switch continuity), and a phone camera to photograph hose and wire routing before removal. Hose ports and spade terminals are standard and reconnect easily.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered for the Carrier PG9MAA060080AFKA gas furnace. Note: OEM part HK06NB123 has been superseded — this listing supplies the current factory-authorized replacement maintaining the identical 1.81" WC SPST specification. Always confirm the water column rating on your existing switch's label before ordering. Our fitment team is available to verify compatibility before you buy — no guesswork, no return hassle.