OEM Carrier Pressure Switch HK02ZB044 — 7 PSI Open / 22 PSI Close for Model PY1REA120224ABWA

This is the genuine OEM Carrier pressure switch (part number HK02ZB044), the factory-specified replacement for the Carrier PY1REA120224ABWA. The pressure switch is a critical safety and sequencing component in your HVAC system — it monitors inducer draft pressure to confirm that the inducer motor has established proper airflow before allowing the ignition sequence to begin. A failed pressure switch typically causes the furnace or air handler to lock out before ignition, often displaying a fault code, or cycling repeatedly without ever reaching the heating stage. Common symptoms include a system that runs the inducer briefly then shuts off, a blinking error code related to pressure sensing, or a unit completely stuck before the burner fires.

• Specs: Opens at 7 PSI | Closes at 22 PSI | 50" wire leads | 24V control circuit | Factory-matched pressure thresholds for precise draft proving
• OEM vs Generic: This is a genuine Carrier OEM part engineered to exact factory tolerances. Aftermarket pressure switches frequently ship with incorrect pressure ratings or inconsistent diaphragm sensitivity, leading to nuisance lockouts or unsafe ignition sequences. OEM ensures accurate trip points every time.
• Install Difficulty: 2/5 — Disconnect power before servicing. Locate the pressure switch on the inducer housing; disconnect the hose port and two wire leads, then swap in the new switch. Tools needed: flathead screwdriver, needle-nose pliers, multimeter (to verify continuity). Always check the hose for cracks or blockages before installing the new switch.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for Carrier model PY1REA120224ABWA. Verify your unit's existing switch pressure ratings (open/close PSI) and lead length against your equipment data plate before ordering. Our HVAC parts specialists are available to confirm fitment before you buy — order with confidence from NationalHVACParts.com.