OEM Carrier High-Fire Pressure Switch HK06WC091 for Model PG8MAA060155AAJA

This OEM Carrier high-fire pressure switch (part number HK06WC091) is the factory-specified replacement for the Carrier PG8MAA060155AAJA gas furnace. The pressure switch monitors the draft inducer motor to confirm it is generating the correct negative pressure (vacuum) before allowing the ignition sequence to proceed. If this switch fails — or if the inducer isn't pulling sufficient draft — the furnace control board will lock out the system before gas is ever introduced, protecting against dangerous flue-gas backdrafting. Common failure symptoms include the furnace attempting to start and immediately locking out, an inducer motor that runs but produces no heat, or a fault code indicating a pressure switch stuck open or closed.

• Specs: SPST (Single Pole Single Throw) | High-Fire configuration | Factory-calibrated W.C. (water column) trip point | Honeywell-manufactured Factory Authorized Part | Direct OEM fit for PG8MAA060155AAJA
• OEM vs Generic: OEM pressure switches are calibrated to exact water-column trip points required by Carrier's IFC board logic. Generic or off-tolerance switches can cause nuisance lockouts or, worse, allow ignition under unsafe draft conditions — always use OEM on safety-critical components.
• Install Difficulty: 2/5 — Power down the furnace and confirm inducer has stopped before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer or magnehelic gauge to verify draft after replacement. Photograph hose routing before disconnecting. Replace the rubber vacuum hose if it shows any cracking.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility & Supersession Note: Fits Carrier model PG8MAA060155AAJA gas furnace. Note that OEM part HK06WC091 has been superseded by replacement part HK06MC110; our listing is fulfilled with the current authorized replacement. Verify your existing switch's W.C. rating on the data plate or switch body before ordering. Questions about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today. In stock — ships today.