OEM Carrier Pressure Switch HK02ZB038 for Model PY1PNA024040ACBA

This OEM Carrier pressure switch (part number HK02ZB038) is the factory-specified inducer pressure switch for the Carrier PY1PNA024040ACBA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm proper venting before allowing the ignition sequence to proceed. When this switch fails or sticks, the control board will not advance past the inducer pre-purge stage — resulting in a no-heat lockout condition, often with a diagnostic fault code indicating a pressure switch fault. A failing switch may also cause intermittent heating, short cycling, or repeated lockouts during cold weather demand.

• Specs: Close Set Point: 22" W.C. | Open Set Point: 7" W.C. | Lead Length: 50" | OEM Part Number: HK02ZB038 | Factory-matched switching thresholds
• OEM vs Generic: This is a genuine Carrier OEM switch calibrated to exact factory W.C. tolerances. Aftermarket substitutes often carry wider pressure tolerances, risking nuisance trips or — more dangerously — failure to detect blocked venting conditions.
• Install Difficulty: 2/5 — Disconnect power before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer if you wish to verify inducer static pressure post-install. Photograph existing wiring and hose routing before disconnecting. Swap hose barb and spade connectors directly to the new switch.
• Warranty: 1-year OEM factory warranty against manufacturing defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed for the Carrier PY1PNA024040ACBA packaged gas/electric unit. Always verify the W.C. rating on your existing switch label and the inducer hose diameter before ordering. Our fitment team is available to confirm compatibility before you buy — order with confidence and get back to heat fast.