OEM Carrier High & Low Pressure Switch Kit 312926-252 / 312926-258 for Model PH13PB048000AAAA

This factory-authorized OEM pressure switch kit includes both the 312926-252 High Pressure Switch (670/470 PSI) and the 312926-258 Low Pressure Switch (55/23 PSI), engineered specifically for the Carrier PH13PB048000AAAA heat pump. Together, these switches continuously monitor refrigerant-side pressure and protect the compressor from operating outside its safe pressure envelope. A failed high-pressure switch typically causes nuisance high-pressure lockouts or a compressor that trips and won't restart; a failed low-pressure switch causes the system to shut down on low-refrigerant faults or prevents the unit from starting in cold ambient conditions.

• Specs — High Pressure Switch (312926-252): Cut-out 670 PSIG | Cut-in 470 PSIG | Manual or auto-reset | Factory Authorized Parts (FAP) OEM replacement
• Specs — Low Pressure Switch (312926-258): Cut-out 55 PSIG | Cut-in 23 PSIG | Auto-reset | OEM Sensata / Carrier FAP designation
• OEM vs Generic: Genuine Carrier FAP switches are calibrated to exact factory cut-out/cut-in thresholds. Aftermarket substitutes frequently carry wider PSI tolerances, which can allow compressor operation outside the safe refrigerant pressure window — leading to premature compressor failure.
• Install difficulty: 3/5 — Refrigerant-side pressure switches require the system to be properly recovered or isolated before disconnection. Tools needed: manifold gauge set, 1/4" and 3/8" service wrenches, multimeter for continuity verification. Licensed HVAC technician installation strongly recommended.
• Warranty: 1-year OEM manufacturer warranty on both switches. Orders ship same business day from our warehouse.

Compatibility: Engineered for the Carrier PH13PB048000AAAA heat pump (4-ton, R-410A). Always verify your unit's data plate and existing pressure switch PSI ratings before ordering. Our parts specialists are available to confirm fitment — contact us before you order if you have any questions. In stock — ships today.