OEM Carrier Pressure Switch w/ Bracket (HK06WC090) for Model PG8UAA042091ADJA

This is the factory OEM pressure switch with integrated mounting bracket for the Carrier PG8UAA042091ADJA packaged gas furnace. The pressure switch is a safety device that monitors negative pressure generated by the inducer motor to confirm proper draft before allowing ignition. If the switch fails to close — or fails to open — the control board will lock out the furnace, preventing it from firing. Common symptoms include a furnace that attempts to start and then immediately locks out, a flashing fault code indicating pressure switch failure, or an inducer that runs continuously without advancing to ignition.

• Specs: -0.33" W.C. (inches water column) set point | SPST (Single-Pole, Single-Throw) | Includes factory mounting bracket | OEM part number HK06WC090
• OEM vs Generic: This OEM switch is calibrated to the exact W.C. rating specified by Carrier engineering. Off-brand substitutes often carry wider trip-point tolerances, which can allow unsafe draft conditions or cause nuisance lockouts — always match the W.C. rating precisely.
• Install difficulty: 2/5 — Power down and disconnect the furnace before beginning. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers. Photograph all hose and wire connections before removal. Swap the rubber pressure hose and two-wire connector to the new switch, secure the bracket, and verify hose integrity before restoring power.
• Warranty: 1-year OEM manufacturer warranty. In-stock orders ship same business day when placed before our daily cutoff.

Compatibility: Engineered as the direct OEM replacement for Carrier model PG8UAA042091ADJA packaged gas furnaces. Also supersedes legacy part numbers HK06WC088, HK06WC086, HK06WC076, HK06WC072, HK06WC073, HK06WC074, HK660001, 326750-751, 310315-751, and 310315-752 — always verify the W.C. rating on your existing switch before ordering. Questions about fitment? Our HVAC parts specialists confirm compatibility before you buy.