OEM Carrier Pressure Switch HK02ZB038 for Model PH12NA02400GADAA

This OEM pressure switch is the factory-specified replacement for the Carrier PH12NA02400GADAA packaged unit. The pressure switch proves that the inducer motor has established adequate draft before allowing the ignition sequence to proceed. When it fails or sticks open, the control board cannot verify proper venting — resulting in a no-heat lockout condition, a blinking fault code, or a furnace that attempts ignition and immediately shuts down before a flame is ever established.

• Specs: Closes at 22" W.C. | Opens at 7" W.C. | 50" lead wire | OEM part number HK02ZB038 | Factory-matched setpoints
• OEM vs Generic: This is a genuine Carrier OEM part manufactured to exact W.C. setpoint tolerances. Aftermarket pressure switches often drift in calibration, causing nuisance lockouts or — worse — failing to detect a true inducer fault, creating a safety risk.
• Install difficulty: 2/5 — Power down the unit at the disconnect before beginning. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer or U-tube if verifying inducer static pressure. Disconnect the rubber hose and two wiring leads, swap the switch, and confirm the hose is fully seated with no cracks before restoring power.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse.

Compatibility: Designed for the Carrier PH12NA02400GADAA packaged unit. Verify the W.C. close/open ratings on your existing switch or equipment data plate before ordering — using an incorrect setpoint switch can cause nuisance lockouts or a legitimate safety hazard. Our team is available to confirm fitment before you buy. Order today and enjoy same-day shipping on all in-stock OEM parts.