OEM Carrier High-Fire Pressure Switch HK06WC091 for Model PG8MAA048135AAJA

This is the OEM factory-specified high-fire pressure switch for the Carrier PG8MAA048135AAJA gas furnace. The pressure switch is a critical safety component that monitors the negative pressure (vacuum) generated by the draft inducer motor before allowing the ignition sequence to proceed. When the inducer is spinning at the correct RPM and the flue is drafting properly, the switch closes — signaling the control board that it is safe to open the gas valve and fire the burners. A failed pressure switch typically results in a no-heat condition: the inducer runs, but the furnace locks out before ignition, often flashing a fault code for "pressure switch open" or "inducer fault."

• Specs: SPST (Single-Pole Single-Throw) | High-Fire rating | Factory-matched W.C. setpoint for PG8MAA048135AAJA | Honeywell-manufactured Factory Authorized Part
• OEM vs Generic: OEM pressure switches are calibrated to exact water column (W.C.) specifications for this furnace. An off-spec generic switch may open too early or fail to close, causing nuisance lockouts or — worse — unsafe operation of the heat exchanger.
• Install difficulty: 2/5 — Turn off power and gas before beginning. Tools needed: flathead screwdriver, needle-nose pliers, manometer (recommended for verification). Inspect the rubber hose for cracks or blockages before installing the new switch, as a clogged port is a common root cause of switch failure.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse. Note: HK06WC091 has been superseded — contact us and we will confirm the correct current replacement (HK06MC110) ships for your unit.

Compatibility: Fits Carrier model PG8MAA048135AAJA gas furnace. Also applies to select Bryant and Payne furnaces sharing this platform. Always verify the W.C. rating on your existing switch's label before ordering. Our fitment team is available to confirm compatibility before you buy — reach out before placing your order and we'll ship the correct part the same day.