OEM Carrier Draft Inducer Pressure Switch 0.18 WC for Model PY3GNAA48130AA

This OEM pressure switch (part number HK06WC061, superseded by HK06MB061) is the factory-specified replacement for the Carrier PY3GNAA48130AA packaged unit. The pressure switch is a safety device that monitors negative pressure created by the draft inducer motor. Once the inducer establishes proper airflow, the switch closes its circuit and allows the ignition sequence to proceed. When this switch fails or sticks open, the control board never receives proof of draft — resulting in a hard lockout before the burners ever fire. Common symptoms include a furnace or packaged unit that runs the inducer but won't advance to ignition, an LED fault code indicating pressure switch failure, or a system that locks out after repeated attempts.

• Specs: 0.18" W.C. (inches water column) setpoint | Single-port draft proving switch | Normally open | Factory-matched Honeywell IS20224-5236 internals | Fits Carrier, Bryant, and Payne branded equipment
• OEM vs Generic: This OEM switch is calibrated to exact factory W.C. tolerances. Aftermarket substitutes often carry wider pressure tolerances, which can cause nuisance lockouts in cold weather or mask a genuine venting obstruction — a safety risk.
• Install difficulty: 2/5 — Disconnect power before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, and a manometer (recommended for verification). Remove the single pressure hose, unplug the two-wire harness, and swap the switch. Always inspect the pressure hose for cracks or blockages before reinstalling.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3GNAA48130AA packaged unit. Note: OEM part HK06WC061 has been officially superseded by HK06MB061 — this listing ships the current authorized replacement. Fits across Carrier, Bryant, and Payne platforms sharing the 0.18" W.C. specification. Verify your unit's existing switch W.C. rating on the data plate or the switch body itself before ordering. Our team is available to confirm fitment.