OEM Carrier Pressure Switch High Fire HK06WC091 for Model PG8MAA066135AAJA

This OEM Carrier SPST (Single-Pole Single-Throw) high-fire pressure switch is the factory-specified replacement for the Carrier PG8MAA066135AAJA gas furnace. The pressure switch is a critical safety device that monitors negative pressure produced by the inducer motor before allowing the ignition sequence to proceed. When the switch fails or gets stuck open, the control board detects no proof of inducer operation and locks out the furnace — resulting in a no-heat call with a pressure switch fault code. Common symptoms include the furnace failing to advance past the inducer stage, continuous inducer operation with no ignition, or intermittent short-cycling in cold weather.

• Specs: SPST (Normally Open) | High Fire configuration | Factory-calibrated W.C. (water column) set point | Replaces OEM part number HK06WC091 | Successor part: HK06MC110
• OEM vs Generic: This OEM-specification switch is factory-calibrated to the exact W.C. set point for the PG8MAA066135AAJA. Generic aftermarket switches often carry wide W.C. tolerances that can cause nuisance lockouts or, worse, allow ignition attempts under unsafe draft conditions.
• Install Difficulty: 2/5 — Disconnect power before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, manometer (recommended to verify W.C. after installation). Always inspect the rubber hose port and tubing for cracks or blockages before replacing the switch alone.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed for the Carrier PG8MAA066135AAJA gas furnace. Cross-references OEM part HK06WC091 (original) and current successor HK06MC110. Verify your existing switch's W.C. rating and hose port configuration against your unit's data plate before ordering. Our fitment team is available to confirm compatibility — just reach out before you buy. Order now and ship today!