OEM Carrier High & Low Pressure Switch Set — 312926-252 & 312926-258 for Model PH14NB030000AAAA

This OEM-matched pair includes the factory-specified High Pressure Switch (312926-252, 670/470 PSI cutout/reset) and Low Pressure Switch (312926-258, 55/23 PSI cutout/reset) for the Carrier PH14NB030000AAAA heat pump. Together, these refrigerant-circuit safety controls continuously monitor system pressure and interrupt compressor operation if pressure strays outside the safe operating band — protecting the compressor from catastrophic over-pressurization or low-charge damage. Symptoms of failure include nuisance lockouts, a compressor that trips on the high-pressure limit shortly after startup, or a system that trips on the low-pressure limit during mild outdoor temperatures.

• Specs — High Pressure Switch (312926-252): 670 PSI cutout | 470 PSI auto-reset | R-410A rated | SPST normally closed | Meets EN12263 & EN60730-2-6 standards
• Specs — Low Pressure Switch (312926-258): 55 PSI cutout | 23 PSI auto-reset | R-410A rated | SPST normally closed | Factory Authorized Parts (Carrier RCD)
• OEM vs Generic: These are genuine Carrier Factory Authorized Parts — not aftermarket. OEM pressure switches are factory-calibrated to exact cutout/reset tolerances, ensuring the compressor is protected at precise thresholds. Generic units often carry wide pressure tolerances that can allow compressor damage before the switch trips.
• Install difficulty: 3/5 — Refrigerant circuit work. The system must be recovered or the circuit safely isolated before replacing refrigerant-side pressure switches. Tools needed: manifold gauge set, refrigerant recovery unit, torque wrench, multimeter. Installation by an EPA 608-certified technician is strongly recommended.
• Warranty: 1-year OEM manufacturer warranty. Orders placed before 3 PM ship same business day from our warehouse.

Compatibility: Engineered for the Carrier PH14NB030000AAAA residential heat pump. Verify refrigerant type (R-410A) and cutout/reset ratings against the data plate before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us before ordering.