OEM Carrier Pressure Switch HK02ZB038 for Model PY1PNA036120ACBA

This is the factory OEM replacement pressure switch for the Carrier PY1PNA036120ACBA packaged unit. The pressure switch monitors the inducer motor's draft pressure to confirm safe venting conditions before allowing the ignition sequence to proceed. When it fails or sticks open, the control board cannot verify that the inducer is operating correctly — resulting in a no-heat condition, repeated ignition lockouts, or a fault code pointing to the inducer/pressure switch circuit. Replacing with the correct OEM part restores factory-calibrated trip points and eliminates nuisance lockouts caused by out-of-spec aftermarket substitutes.

• Specs: 22 PSI close | 7 PSI open | 50" lead wire | OEM Part Number: HK02ZB038 | Also referenced as PS80-02-F0074
• OEM vs Generic: This OEM switch is factory-calibrated to the exact water column (W.C.) rating required by the PY1PNA036120ACBA heat exchanger design. Generic pressure switches often carry ±15% tolerance on trip points, which can cause unsafe short-cycling or nuisance lockouts.
• Install difficulty: 2/5 — Shut off power to the unit at the disconnect and thermostat before beginning. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, and a multimeter (to confirm switch continuity before and after). Photograph all hose and wire connections before removal. Swap the rubber hose and two-wire harness connector directly to the new switch.
• Warranty: 1-year OEM manufacturer warranty against defects. Orders placed before 3 PM ship same business day from our warehouse.

Compatibility: Engineered for the Carrier PY1PNA036120ACBA packaged unit. Always verify the OEM part number on your existing switch or equipment data plate before ordering. Our HVAC parts team is available to confirm fitment — contact us before you buy if you have any questions.