OEM Carrier Pressure Switch HK02ZB044 for Model PY1REA120180ABWB

This OEM Carrier pressure switch (part number HK02ZB044) is the factory-authorized replacement for the Carrier PY1REA120180ABWB packaged unit. The pressure switch monitors inducer motor operation by proving a sufficient negative pressure (draft) before allowing the ignition sequence to proceed. When this switch fails or sticks open, the furnace section will enter lockout — the inducer will run but the system will not advance to ignition, resulting in a no-heat condition. A faulty pressure switch is one of the most common causes of furnace lockout codes in Carrier packaged equipment.

• Specs: 7 PSI open / 22 PSI close | 50" lead wires | 24V control circuit | Country of origin: Mexico | OEM part number: HK02ZB044
• OEM vs Generic: This is a genuine Carrier OEM pressure switch engineered to exact factory design specifications and tolerances. OEM switches maintain original safety certifications and agency listings. Aftermarket substitutes may have inconsistent trip points, increasing the risk of nuisance lockouts or unsafe operation.
• Install difficulty: 2/5 — Disconnect power before servicing. Tools needed: flat-head and Phillips screwdrivers, 1/4" nut driver, needle-nose pliers, manometer (recommended to verify switch actuation). Photograph all wire connections before disconnecting. Inspect the pressure tubing for cracks or blockages before installing the new switch.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PY1REA120180ABWB packaged unit. Always verify your unit's existing pressure switch trip points (open and close PSI) against your equipment's data plate and wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment — reach out before you order if you have any questions. In stock and ships today.