OEM Carrier Dual Pressure Switch Assembly HK06NB012 / HK02LB008 for Model PG95XAT30040AAAA

This OEM dual pressure switch assembly is the factory-specified replacement for the Carrier PG95XAT30040AAAA 95% AFUE gas furnace. The kit includes both the HK06NB012 Dual Pressure Switch Assembly and the HK02LB008 Gas Pressure Switch, covering the complete inducer-proving circuit. These switches are normally-open safety devices that close only when the inducer motor creates the correct negative pressure (vacuum) in the flue system — confirming safe combustion airflow before allowing ignition to proceed. If either switch fails or a hose cracks, the control board will lock out the furnace before a single spark is attempted. Typical symptoms include a blinking fault code for "pressure switch stuck open," no ignition after inducer start, or a furnace that runs the inducer but shuts off within 30 seconds.

• Included Parts: HK06NB012 Dual Pressure Switch Assembly (2-port, dual-stage proving) + HK02LB008 Gas Pressure Switch (LP/propane sensing) — both factory-matched water column ratings for the PG95XAT30040AAAA
• OEM vs Generic: OEM switches are factory-calibrated to exact W.C. setpoints. Generic aftermarket switches frequently carry ±15% W.C. tolerances, risking nuisance lockouts in cold weather or false "safe" closures under marginal inducer performance.
• Install Difficulty: 3/5 — Turn off power and gas before beginning. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, a manometer or digital vacuum gauge (recommended to verify W.C. setpoint post-install), and smartphone to photograph all hose and wiring connections before removal. Check all rubber vacuum hoses for cracks while the panel is open.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered and factory-matched for the Carrier PG95XAT30040AAAA 95% AFUE, single-stage, 40,000 BTU packaged gas furnace. Verify your model number on the unit data plate before ordering. Cross-references: HK06NB012 superseded by HK06MB012; HK02LB008 also referenced as GFS3451-4036. Our fitment team is available to confirm compatibility before you order — order by 3 PM and ships today.