OEM Carrier High & Low Pressure Switch Kit (312926-252 & 312926-258) for Model PH14NB01800GAAAA

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 pressure safety controls that protect the compressor in your Carrier PH14NB01800GAAAA heat pump system. The high-side switch monitors refrigerant pressure and trips the compressor offline if pressure exceeds the safe upper threshold, while the low-side switch prevents the compressor from running under low-refrigerant or loss-of-charge conditions. When either switch fails, you'll typically see a system lockout, nuisance tripping, compressor fault codes, or a unit that short-cycles and shuts down within minutes of startup.

• Specs — High Pressure Switch (312926-252): 670 PSI cut-out / 470 PSI cut-in | SPST normally-closed | OEM-matched wiring terminals | Factory Authorized Part
• Specs — Low Pressure Switch (312926-258): 55 PSI cut-out / 23 PSI cut-in | SPST normally-closed | Pre-wired leads | Factory Authorized Part
• OEM vs Generic: OEM Carrier pressure switches are calibrated to exact cut-in/cut-out tolerances at the factory. Aftermarket substitutes often carry ±10–15% pressure tolerances, risking compressor damage from under- or over-pressure operation. Always use OEM on refrigerant-side safety controls.
• Install difficulty: 3/5 — Refrigerant-side pressure switches require recovering system charge before replacement in most configurations. Tools needed: manifold gauge set, refrigerant recovery unit, torque wrench, multimeter. Installation by an EPA 608-certified technician is strongly recommended.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PH14NB01800GAAAA heat pump. Confirm both part numbers against your unit's wiring diagram or data plate before ordering. Not sure? Our HVAC parts specialists verify fitment before you buy — call or chat now. In stock and ready to ship today.