OEM Carrier Pressure Switch HK02ZB038 for Model PY1PEA036100ADBA

This is the factory OEM replacement pressure switch (part number HK02ZB038) for the Carrier PY1PEA036100ADBA packaged unit. The pressure switch is a safety device that proves the inducer motor is operating correctly before allowing the ignition sequence to begin. It monitors negative pressure in the flue/drain system via a rubber hose connected to the inducer housing. When this switch fails, the control board never receives the "inducer proven" signal, resulting in a hard lockout — no ignition, no heat. Common symptoms include the inducer running continuously with no spark, error codes for pressure switch fault, or a unit that attempts ignition three times and then shuts down.

• Specs: Closes at 22" W.C. | Opens at 7" W.C. | 50" lead wire length | Factory-matched setpoint tolerance for precise inducer proof verification
• OEM vs Generic: This is a genuine OEM Carrier part manufactured to exact factory W.C. setpoints. Aftermarket pressure switches frequently carry ±15% trip-point tolerances that can cause nuisance lockouts or — worse — allow marginal inducer performance to go undetected, creating a safety risk.
• Install difficulty: 2/5 — Power down and lock out the unit before beginning. Tools needed: 1/4" nut driver, flathead screwdriver, and a multimeter set to continuity. Disconnect the rubber hose and two wire leads from the old switch, confirm new switch continuity when hose is pressurized, and reconnect. Always inspect the rubber hose for cracks or blockages before reinstalling.
• Warranty: 1-year OEM factory warranty against manufacturing defects. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for the Carrier PY1PEA036100ADBA packaged gas/electric unit. Verify the W.C. rating printed on your existing switch before ordering — multiple pressure switch part numbers may be used across the PY1PEA series depending on production date and configuration. Our fitment team is available to confirm compatibility before you purchase.