OEM Carrier SPST High-Fire Pressure Switch HK06WC091 for Model PG8JAA036045AAJA

This is the OEM factory-specified SPST high-fire pressure switch for the Carrier PG8JAA036045AAJA gas furnace. Manufactured by Honeywell as a Factory Authorized Part, this switch monitors the negative pressure created by the draft inducer motor to confirm safe flue venting before allowing the ignition sequence to proceed. When this switch fails or sticks open, the furnace control board cannot verify inducer operation, resulting in a pre-ignition lockout, a flashing fault code, or a furnace that simply will not heat.

• Specs: SPST (Single Pole, Single Throw) | High-Fire configuration | Factory Authorized Honeywell-manufactured switch | Replaces / superseded by HK06MC110 where applicable
• OEM vs Generic: This is the genuine OEM part engineered to exact W.C. (water column) setpoint tolerances for the PG8JAA036045AAJA. Aftermarket pressure switches often carry wider opening/closing tolerances, which can cause nuisance lockouts or — more dangerously — fail to shut down the furnace during an actual flue blockage event.
• Install difficulty: 2/5 — Shut off power and gas before beginning. Tools needed: 1/4" nut driver, needle-nose pliers, and a short length of 5/16" tubing if the original hose is cracked. Note hose routing and wiring terminal positions before disconnecting. Verify the replacement W.C. rating matches the original data label on your pressure switch.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PG8JAA036045AAJA gas furnace. Note that OEM part HK06WC091 has been superseded — our listing ships the current authorized replacement (HK06MC110) where stock of the original has been exhausted, ensuring a fully compatible, factory-approved fit. Always verify the W.C. rating and switch type on your existing unit's data plate before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — no guesswork.