OEM Carrier SPST High-Fire Pressure Switch HK06WC091 for Model PG8MAA036045AAJA

This is the OEM factory-specified high-fire pressure switch for the Carrier PG8MAA036045AAJA gas furnace. The pressure switch is a safety device that monitors the negative pressure (vacuum) created by the draft inducer motor. If the inducer is not operating at the correct RPM or the flue path is partially blocked, the switch will not close — preventing ignition and locking out the furnace. The most common symptom of a failed pressure switch is a furnace that starts the inducer motor, then shuts down before the igniter ever fires, often resulting in a fault code indicating a pressure switch error.

• Specs: SPST (Single Pole, Single Throw) | High-Fire configuration | Honeywell-manufactured Factory Authorized Part | Part Number: HK06WC091 | Superseded by HK06MC110
• OEM vs Generic: This is a genuine Carrier OEM pressure switch manufactured to exact water-column (W.C.) setpoint specifications. Aftermarket substitutes may carry different trip points, risking nuisance lockouts or — more critically — unsafe flue operation.
• Install difficulty: 2/5 — Shut off power and gas before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, multimeter (to verify switch continuity). Inspect rubber hose connections for cracks or blockages before replacing the switch. Photograph all hose routing prior to disconnection.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered by 3PM local time.

Compatibility: Designed for the Carrier PG8MAA036045AAJA gas furnace. Also fits many Carrier, Bryant, and Payne gas furnace models — verify the W.C. rating on your existing switch and cross-reference with HK06WC091 or its current supersession HK06MC110 before ordering. Our fitment team is available to confirm compatibility prior to purchase. Order now — in stock and ships today.