OEM Carrier Pressure Switch HK02ZB044 for Model PY1REA090180ACWB

This is the factory OEM replacement pressure switch (part number HK02ZB044) for the Carrier PY1REA090180ACWB packaged unit. The pressure switch monitors the inducer blower's negative pressure to prove that combustion airflow is adequate before allowing ignition to proceed. When this switch fails or sticks open, the control board cannot complete the ignition sequence — resulting in a no-heat condition, repeated lockout attempts, or a fault code pointing to the inducer or pressure circuit.

• Specs: Opens at 7 PSI | Closes at 22 PSI | 50" wire leads | 24V control circuit | Manufactured in Mexico to OEM tolerances
• OEM vs Generic: This is a genuine Carrier OEM part, manufactured to exact design specifications for the PY1REA090180ACWB. Aftermarket switches frequently ship with incorrect W.C. ratings or lead lengths, causing nuisance lockouts or unsafe operation. OEM ensures correct set-point calibration every time.
• Install difficulty: 2/5 — Power down and tag out the unit before servicing. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter (for continuity test). Photograph the hose and wire routing before disconnecting. Verify hose port is clear of blockage before installing new switch.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Engineered for the Carrier PY1REA090180ACWB packaged unit. Always cross-reference your unit's data plate and confirm the switch W.C. rating before ordering. Our team is available to verify fitment — contact us before you order if you have any questions.