OEM Carrier Pressure Switch HK02ZB038 — 7" Open / 22" Close for Model PY1PPA042080ACBA

This is the genuine OEM Carrier pressure switch (part number HK02ZB038), factory-specified for the Carrier PY1PPA042080ACBA packaged unit. The pressure switch monitors inducer motor draft by sensing negative pressure in the flue circuit. When the inducer reaches proper airflow, the switch closes and signals the control board to advance ignition. A failed pressure switch causes the system to lock out before the ignition sequence begins — leaving you with a call for heat and no burner response.

• Specs: Opens at 7" W.C. | Closes at 22" W.C. | 50" wire leads | Pressurestat-style single-port design | Cross-reference: PS80-02-F0074
• OEM vs Generic: This is a genuine Carrier OEM part, matched to factory set-point tolerances. Off-brand substitutes frequently have drift in trip thresholds, causing nuisance lockouts or — worse — allowing ignition under unsafe draft conditions.
• Install difficulty: 2/5 — Shut off power and gas before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer to verify draft pressure post-installation. Photograph existing hose routing and wiring before disconnecting the old switch.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed for the Carrier PY1PPA042080ACBA packaged gas/electric unit. Always verify the W.C. rating stamped on your existing switch before ordering — units of the same model series can carry different pressure switch ratings depending on production date and configuration. Questions about fitment? Our HVAC parts team will verify compatibility before you buy.