OEM Carrier High & Low Pressure Switch Set (312926-252 / 312926-258) for Model PH15NB04800GBAAA

This factory-matched OEM pressure switch set includes both the High Pressure Switch (312926-252, 670/470 PSI) and the Low Pressure Switch (312926-258, 55/23 PSI) — the exact safety controls specified for the Carrier PH15NB04800GBAAA heat pump. These switches continuously monitor refrigerant circuit pressure and open the control circuit when readings fall outside safe operating limits. A failed high-side switch typically triggers a hard lockout or nuisance trip on high refrigerant pressure; a failed low-side switch causes the system to fault out shortly after startup due to apparent low-pressure conditions — both symptoms often misdiagnosed as refrigerant leaks or compressor failure.

• Specs — High Pressure Switch (312926-252): 670 PSI cut-out | 470 PSI cut-in | Normally closed | OEM Carrier Factory Authorized Part
• Specs — Low Pressure Switch (312926-258): 55 PSI cut-out | 23 PSI cut-in | Normally closed | OEM Carrier Factory Authorized Part
• OEM vs Generic: OEM switches are precision-calibrated at the factory to exact PSI set points. Generic substitutes frequently carry ±10–15% pressure tolerances, risking nuisance trips, compressor damage, or failure to protect during a true fault condition.
• Install difficulty: 3/5 — Refrigerant circuit work requires an EPA 608 certified technician. Tools needed: manifold gauge set, refrigerant recovery equipment, adjustable wrench, multimeter. Always recover refrigerant before removing switches. Photograph all wiring connections before disconnecting leads.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PH15NB04800GBAAA 4-ton R-410A packaged heat pump. Verify refrigerant type and PSI ratings on your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — in stock and ready to ship today.