OEM Carrier High & Low Pressure Switch Kit — 312926-252 & 312926-258 for PH15NA060000BAAA

These are the factory-specified OEM replacement pressure switches for the Carrier PH15NA060000BAAA heat pump. The high pressure switch (312926-252, rated 670-470 psi) monitors refrigerant discharge pressure and opens the circuit if pressure climbs dangerously high — protecting the compressor from catastrophic failure. The low pressure switch (312926-258, rated 55-23 psi) guards against low-refrigerant or loss-of-charge conditions that can cause the compressor to run dry. Together, they form the primary refrigerant safety circuit. Common failure symptoms include nuisance high- or low-pressure lockouts, a system that trips off shortly after startup, or fault codes on the thermostat or control board indicating a pressure-circuit open.

• Specs — High Pressure Switch 312926-252: 670 psi cut-out / 470 psi cut-in | Automatic reset | Factory Authorized Carrier OEM part | Replaces legacy p/n 312926252
• Specs — Low Pressure Switch 312926-258: 55 psi cut-out / 23 psi cut-in | Automatic reset | Factory Authorized Carrier OEM part | Sensata / PS80-02 platform
• OEM vs Generic: OEM switches are precision-calibrated at the factory to exact cut-in/cut-out setpoints. Aftermarket pressure switches frequently deviate ±10–15 psi, risking compressor damage or nuisance trips that waste service calls.
• Install difficulty: 3/5 — Refrigerant system must be recovered or isolated before replacing pressure switches on a live refrigerant circuit. Tools needed: manifold gauge set, torque wrench, Schrader valve core tool, refrigerant recovery equipment. Always verify new switch setpoints match data plate specs before recharging. Licensed HVAC/R technician installation strongly recommended.
• Warranty: 1-year OEM factory warranty. Ships same business day from our stocked warehouse.

Compatibility: Engineered for Carrier PH15NA060000BAAA packaged heat pump units. Verify refrigerant type (R-410A) and existing switch p/n on your unit's wiring diagram or data plate before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you order — contact us today. In stock and ships today.