OEM Carrier High & Low Pressure Switch Kit — 312926-252 & 312926-258 for Model PH14NB060000AAAA

This listing covers both factory-specified OEM refrigerant pressure switches for the Carrier PH14NB060000AAAA heat pump: the 312926-252 High Pressure Switch (670-470#) and the 312926-258 Low Pressure Switch (55-23#). Together, these safety controls continuously monitor refrigerant circuit pressure. The high-pressure switch opens and locks out the system when refrigerant pressure exceeds safe operating limits — typically caused by a dirty condenser coil, failed condenser fan motor, or refrigerant overcharge. The low-pressure switch opens when pressure drops too low, protecting the compressor from running in a starved-refrigerant condition due to leaks or a failed metering device. Either fault will result in a system lockout, a fault code on the thermostat or control board, or the unit short-cycling within minutes of startup.

• Specs — High Pressure Switch (312926-252): 670 PSI cut-out / 470 PSI cut-in | Nylon case | Brass contacts | Factory Authorized Part (FAP) | OEM cross-ref: 312926252
• Specs — Low Pressure Switch (312926-258): 55 PSI cut-out / 23 PSI cut-in | Compact aluminum body | Pre-wired leads | Factory Authorized Part (FAP) | OEM cross-ref: 312926258
• OEM vs Generic: These are genuine Carrier Factory Authorized Parts — not aftermarket copies. OEM switches are factory-calibrated to exact cut-in/cut-out pressures. Generic substitutes often carry ±10% pressure tolerances, risking nuisance lockouts or, worse, failure to protect the compressor.
• Install difficulty: 3/5 — Refrigerant circuit work requires EPA 608 certification. Recover refrigerant before replacing either switch. Tools needed: manifold gauge set, refrigerant recovery unit, adjustable wrench, multimeter. Always verify switch continuity before condemning. Photograph all wiring before disconnecting.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse.

Compatibility: Both switches are OEM-specified replacements for the Carrier PH14NB060000AAAA residential heat pump. Verify your unit's data plate and existing switch cut-in/cut-out ratings before ordering to confirm exact fitment. Not sure which switch you need? Our HVAC parts specialists verify fitment before you buy — questions welcome.