OEM Carrier Pressure Switch 7#Open / 22#Close / 50" Leads for Model PH12NA030000AAAA

This OEM pressure switch (part number HK02ZB038) is the factory-specified replacement for the Carrier PH12NA030000AAAA packaged heat pump system. The pressure switch monitors refrigerant or system pressure and sends a signal to the control board to allow or interrupt operation. When it fails or sticks open, the unit will typically lock out before or during the heating/cooling cycle — leaving you with a system that won't start, throws a pressure fault code, or shuts down immediately after attempting to run.

• Specs: Opens at 7 PSI | Closes at 22 PSI | 50" wire leads | Factory-calibrated set points | OEM part number HK02ZB038 (also cross-referenced as PS80-02-F0074)
• OEM vs Generic: This is a genuine Carrier OEM switch with precision-calibrated open/close set points. Generic alternatives often drift outside the ±1 PSI tolerance required for reliable operation, risking nuisance lockouts or missed fault conditions that can damage the compressor.
• Install difficulty: 2/5 — Disconnect power before servicing. Tools needed: 1/4" nut driver or flat-head screwdriver, needle-nose pliers. Note lead wire positions before disconnecting. Typical swap time is under 15 minutes for a qualified technician.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PH12NA030000AAAA packaged heat pump unit. Always verify your unit's data plate and wiring diagram to confirm the switch set points match before installing. Cross-reference: PS80-02-F0074. Need help confirming fitment? Our HVAC parts specialists are standing by — order with confidence and get back up and running today.