OEM Payne Pressure Switch HK02ZB044 for Model PA1RPA090000ACWA

This is the factory OEM replacement pressure switch (part number HK02ZB044) for the Payne PA1RPA090000ACWA gas furnace. The pressure switch is a critical safety component that monitors the negative pressure created by the inducer draft motor before allowing the ignition sequence to proceed. When it fails or sticks open, the furnace control board detects no proof of draft and locks out the system — resulting in a no-heat call with a blinking fault code, typically before any ignition attempt is made.

• Specs: OEM-matched water column (W.C.) rating | Single-port pressure switch | 24V control circuit compatible | Factory-calibrated diaphragm for precise draft sensing on the PA1RPA090000ACWA
• OEM vs Generic: OEM pressure switches are calibrated to the exact W.C. rating required by Payne engineering. Off-brand substitutes with loose tolerances can trip prematurely in cold weather or fail to trip at all, creating an unsafe operating condition and voiding equipment warranties.
• Install Difficulty: 2/5 — Disconnect power before servicing. Tools needed: flathead screwdriver, needle-nose pliers, and a manometer (recommended to verify W.C. after install). Disconnect the rubber hose from the inducer housing, swap the switch, and reconnect the wiring harness plug.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Payne PA1RPA090000ACWA gas furnace. Always cross-reference the OEM part number HK02ZB044 against your unit's data plate and existing switch label before ordering. If you are unsure of fitment, our HVAC parts specialists are available to verify compatibility before your order ships — at no charge.