OEM Carrier High & Low Pressure Switch Kit (312926-252 / 312926-258) for Model PH14NB03000GAAAA

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) — the two refrigerant-side safety controls for the Carrier PH14NB03000GAAAA heat pump. These switches continuously monitor refrigerant pressure on both the high and low sides of the refrigerant circuit. When pressure drifts outside the safe operating window, the switch opens, cutting power to the compressor to prevent catastrophic failure. Symptoms of a failed pressure switch include nuisance lockouts, short-cycling, compressor not starting, or a system that runs briefly then shuts off on a fault code.

• Part Numbers: 312926-252 (High Pressure Switch — 670 PSI cut-out / 470 PSI cut-in) | 312926-258 (Low Pressure Switch — 55 PSI cut-out / 23 PSI cut-in) | Fits Carrier PH14NB03000GAAAA
• OEM vs Generic: Factory-authorized OEM switches are calibrated to exact PSI set points at the Carrier factory. Generic aftermarket alternatives often carry ±15% pressure tolerances, which can allow the compressor to run outside safe parameters — risking refrigerant slugging or compressor burnout.
• Install Difficulty: 3/5 — Refrigerant-side component. System must be recovered before replacing. Tools required: manifold gauge set, refrigerant recovery machine, torque wrench, multimeter for continuity verification. Licensed HVAC/R technician (EPA 608 certified) strongly recommended.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: This kit is engineered specifically for the Carrier PH14NB03000GAAAA heat pump. Always verify refrigerant type and PSI ratings against your unit's data plate before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before every order — contact us and we'll confirm the right part for your unit before you buy.