OEM Carrier SPST High-Fire Pressure Switch HK06WC091 for Model PG8JAA066135AAJA

This OEM Carrier pressure switch (part number HK06WC091) is the factory-specified draft-proving switch for the Carrier PG8JAA066135AAJA gas furnace. The pressure switch monitors the inducer blower's vacuum to confirm that combustion gases are being safely vented before allowing the furnace to proceed to ignition. When this switch fails or sticks open, the furnace will lock out before the ignition stage — a common symptom being a running inducer motor with no burner flame and a fault code indicating a pressure switch error. Note: HK06WC091 has been superseded; the current OEM replacement is HK06MC110. Contact our fitment team to confirm the correct part for your serial number.

• Specs: SPST (Single-Pole, Single-Throw) | High-Fire rated | Factory Authorized Part manufactured by Honeywell | Designed for negative-pressure draft proving on induced-draft gas furnaces
• OEM vs Generic: OEM pressure switches are calibrated to precise water-column (W.C.) trip points. Off-spec generics can open too early or fail to open at all, causing nuisance lockouts or — worse — unsafe furnace operation. Always use OEM on safety-critical switches.
• Install difficulty: 2/5 — Power down the furnace at the disconnect before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer to verify W.C. setting if reusing tubing. Photograph hose and wiring connections before removal. The switch mounts on the inducer housing or bracket with one or two screws.
• Warranty & Shipping: 1-year OEM factory warranty against defects. In stock — ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG8JAA066135AAJA gas furnace. Also cross-references to Carrier, Bryant, and Payne furnace platforms sharing this high-fire pressure switch specification. Verify your unit's data plate and inducer vacuum rating before ordering, or use our free fitment verification service. Order now and get your furnace back online — fast.