OEM Carrier Pressure Switch HK02ZB038 for Model PY1PNA018040ACBA

This is the factory OEM replacement pressure switch for the Carrier PY1PNA018040ACBA furnace, sold under Carrier part number HK02ZB038. The pressure switch is a safety device that proves the induced draft blower is operating correctly before allowing the ignition sequence to begin. It monitors negative pressure inside the flue system via a rubber hose connected to the inducer housing. When the switch fails — or when the hose cracks, clogs, or collapses — the furnace will lock out before ignition, often displaying a fault code and leaving you with no heat.

• Specs: Close pressure: 22" W.C. | Open pressure: 7" W.C. | Lead length: 50" | Single-port, normally open configuration | Factory-calibrated setpoints
• OEM vs Generic: This is a genuine Carrier OEM switch with precision-calibrated W.C. setpoints. Aftermarket switches frequently drift ±15% from rated pressure, causing nuisance lockouts or, worse, failing to prove a true inducer fault — a potential safety hazard.
• Install difficulty: 2/5 — Turn off power and gas before beginning. Tools needed: flathead screwdriver, needle-nose pliers, and a multimeter for continuity verification. Inspect and replace the rubber pressure hose if cracked or kinked during the same service call.
• Warranty: 1-year OEM factory warranty against manufacturing defects. Ships same business day from our warehouse stock.

Compatibility: Engineered as a direct OEM drop-in for the Carrier PY1PNA018040ACBA furnace. Always verify the W.C. rating and lead length printed on your original switch before ordering. Our fitment team is available to confirm compatibility — reach out before you order and we'll make sure you get the right part, guaranteed. Order now and ship today.