OEM Carrier High & Low Pressure Switch Kit (312926-252 / 312926-258) for Model PH14NA018000AAAA

This listing includes both factory OEM pressure switches for the Carrier PH14NA018000AAAA heat pump: the 312926-252 High Pressure Switch (670/470 PSI) and the 312926-258 Low Pressure Switch. These safety switches continuously monitor refrigerant circuit pressure to protect the compressor from damaging over-pressure and under-pressure conditions. When either switch trips — or fails in an open position — the system will lock out on a fault, refuse to run, or cycle erratically. Replacing both switches together is best practice whenever one is suspect, since they are subject to the same operating hours and refrigerant exposure.

• Part Numbers: 312926-252 (High Pressure Switch, 670/470 PSI set/reset) | 312926-258 (Low Pressure Switch) | Factory Authorized Carrier OEM parts — no substitutions on safety-critical refrigerant controls.
• OEM vs Generic: Carrier-spec pressure switches are calibrated to exact cut-out and cut-in pressures for R-410A systems. Off-brand switches often carry wider tolerances, risking nuisance trips or — worse — failing to protect the compressor at true over-pressure events.
• Install Difficulty: 3/5 — Refrigerant circuit work must be performed by an EPA 608-certified technician. Tools needed: manifold gauge set, torque wrench, leak detector, and multimeter. Always recover refrigerant per EPA regulations before opening the refrigerant circuit.
• Warranty: 1-year OEM manufacturer warranty. In-stock — ships same business day from our warehouse.

Compatibility: These switches are the direct OEM replacement for Carrier PH14NA018000AAAA heat pump units. Always verify refrigerant type (R-410A) and pressure ratings on your unit's data plate before installation. Our fitment team is available to confirm compatibility before you order — no guesswork.