OEM Carrier Pressure Switch HK02ZB038 for Model PH10JA03600GADAA

This OEM pressure switch (part number HK02ZB038) is the factory-specified replacement for the Carrier PH10JA03600GADAA packaged unit. The pressure switch monitors inducer motor operation by proving negative pressure in the heat exchanger before allowing ignition to proceed. When it fails or sticks open, the control board cannot confirm safe draft, and the system will lock out before ignition — leaving you with no heat. A faulty pressure switch often triggers a diagnostic fault code and can be confirmed by measuring continuity across the switch terminals while the inducer is running.

• Specs: Close Set Point: 22" W.C. | Open Set Point: 7" W.C. | Lead Length: 50" | SPST normally-open configuration | Factory-matched calibration
• OEM vs Generic: This is a genuine Carrier OEM switch calibrated to exact W.C. setpoints. Aftermarket substitutes frequently drift outside tolerance, causing nuisance lockouts or — more dangerously — failing to prove adequate draft, which can allow combustion gases to back-draft into living spaces.
• Install Difficulty: 2/5 — Turn off power at the disconnect before beginning. Tools needed: 1/4" nut driver, needle-nose pliers, and a short length of tubing to confirm port connections. Always label or photograph hose routing before disconnecting. Typical swap time: 20–30 minutes.
• Warranty: 1-year OEM manufacturer warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier PH10JA03600GADAA packaged units. Verify your existing switch's W.C. rating and lead length against your unit's data plate before ordering. Cross-reference: PS80-02-F0074. Our fitment team is available to confirm compatibility before you buy — order with confidence and get your system back online today.