OEM Carrier Furnace Pressure Switch 1.81" WC (HK06NB123) for Model PG9MAA024060AFKA

This is the factory-specified OEM pressure switch for the Carrier PG9MAA024060AFKA gas furnace. The pressure switch is a critical safety component that monitors inducer motor operation and draft pressure before allowing the ignition sequence to proceed. When it fails or sticks open, the furnace control board interprets a loss of negative pressure, immediately halting the ignition sequence — resulting in a no-heat condition, repeated lockout faults, or a furnace that simply refuses to fire despite the inducer running normally.

• Specs: 1.81" WC (inches water column) set point | SPST (single-pole, single-throw) configuration | Standard hose barb and quick-connect terminals | OEM part number HK06NB123
• OEM vs Generic: This OEM switch is calibrated to Carrier's exact 1.81" WC factory specification with tight switching tolerance. Aftermarket switches commonly vary ±10–15% in trip point, risking nuisance lockouts or — more dangerously — allowing operation under unsafe draft conditions.
• Install Difficulty: 2/5 — A straightforward swap accessible in the blower/inducer compartment. Tools needed: 1/4" nut driver, needle-nose pliers, and a short length of replacement vacuum tubing (if existing tubing is cracked). Always verify 24V control power is off before disconnecting wiring. Photograph existing hose routing before removal.
• Warranty: 1-year OEM manufacturer warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG9MAA024060AFKA gas furnace. Note that HK06NB123 has been superseded in some supply chains by HK06NB124 — both maintain the same 1.81" WC rating and are functionally interchangeable. Verify the WC rating on your existing switch's label before ordering. Our fitment team is available to confirm compatibility before you buy — order with confidence and get your heat back on today.