OEM Carrier SPST High-Fire Pressure Switch HK06WC091 for Model PG8JAA048135AAJA

This OEM Carrier SPST pressure switch (part number HK06WC091) is the factory-specified replacement for the Carrier PG8JAA048135AAJA gas furnace. The pressure switch is a critical safety device that monitors the draft inducer motor's negative pressure (vacuum) to confirm safe venting before allowing the ignition sequence to proceed. When the switch fails — or when it detects insufficient inducer vacuum — it interrupts the control circuit, preventing gas flow and locking out the furnace. Common symptoms include a furnace that runs the inducer briefly then shuts down without igniting, a continuous inducer-on-but-no-heat condition, or a pressure switch fault code displayed on the control board.

• Specs: SPST (Single Pole Single Throw) | High-Fire rated | Factory Authorized Part (Honeywell-manufactured) | Replaces superseded OEM part HK06MC110 | Designed for single-stage gas furnace applications
• OEM vs Generic: This is a genuine OEM Carrier pressure switch meeting factory-exact W.C. (water column) setpoint and snap-action tolerances. Aftermarket switches often use wider pressure tolerances that can cause nuisance lockouts or, more critically, unsafe venting conditions — always use OEM on pressure switches.
• Install Difficulty: 2/5 — Straightforward swap requiring no special tools. Tools needed: 1/4" nut driver or flathead screwdriver, needle-nose pliers, and a short length of replacement tubing if the hose port is cracked. Always check the rubber hose for cracks, blockages, or moisture before condemning the switch itself. Turn off power at the breaker before beginning.
• Warranty & Shipping: 1-year OEM factory warranty. Ships same business day from our warehouse — get your furnace back online fast.

Compatibility: Verified OEM fit for Carrier model PG8JAA048135AAJA gas furnace. This part also crosses to Bryant and Payne furnaces using the same HK06WC091 specification. Note: HK06WC091 has been superseded by HK06MC110 — both part numbers are fulfilled from current OEM stock. Verify your unit's existing pressure switch W.C. rating on the data plate or switch label before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you order.