OEM Carrier High & Low Pressure Switch Set (312926-252 & 312926-258) for PH14NB04200GAAAA

These two OEM Carrier refrigerant pressure switches are the factory-authorized replacements for the Carrier PH14NB04200GAAAA heat pump. The high pressure switch (312926-252, 670/470 PSI) monitors the high side of the refrigerant circuit and opens the compressor circuit if discharge pressure exceeds safe limits, preventing catastrophic compressor failure. The low pressure switch (312926-258, 55/23 PSI) monitors the suction side and shuts down the compressor under low-charge or low-load conditions. A failed pressure switch typically causes a system lockout with a fault code, intermittent no-cooling or no-heating, or a compressor that trips and won't restart. Always diagnose which switch has failed using a manifold gauge set before replacing.

• Specs — High Pressure Switch (312926-252): 670 PSI cut-out / 470 PSI cut-in | Refrigerant pressure safety control | OEM factory-authorized replacement | Manufacturer part number: 312926-252
• Specs — Low Pressure Switch (312926-258): 55 PSI cut-out / 23 PSI cut-in | Suction-side refrigerant safety control | OEM factory-authorized replacement | Manufacturer part number: 312926-258
• OEM vs Generic: OEM Carrier pressure switches are calibrated to exact factory cut-out and cut-in setpoints. Generic aftermarket switches frequently carry wide PSI tolerances that allow the system to operate outside safe refrigerant pressure boundaries, risking compressor damage and voiding system warranty.
• Install difficulty: 3/5 — EPA 608 certification required to handle refrigerant. Tools needed: manifold gauge set, refrigerant recovery unit, adjustable wrench, multimeter, and Schrader valve core tool. Always recover refrigerant before removing any pressure switch. Photograph and label wiring before disconnecting. Torque fittings to spec to prevent leaks.
• Warranty: 1-year OEM manufacturer warranty on both switches. Orders placed before cut-off ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PH14NB04200GAAAA heat pump. Verify both part numbers against your unit's wiring diagram and data plate before ordering. Not sure which switch failed? Our HVAC parts team can help you confirm fitment and diagnose the right part — contact us before you order.