OEM Carrier 55-23# Low Pressure Switch 312926-258 for Model PH15NB04800GACAA

This is the genuine OEM factory-specified low pressure switch for the Carrier PH15NB04800GACAA heat pump. Part number 312926-258, this 55-23# switch continuously monitors refrigerant pressure on the low side of the refrigerant circuit. When system pressure drops below the threshold — due to a refrigerant leak, blocked filter, or failed metering device — the switch opens and cuts power to the compressor, preventing costly damage from running under inadequate pressure conditions. Common symptoms of a failed low pressure switch include the system not starting, the compressor cycling off immediately after startup, or a fault code indicating a low-pressure lockout.

• Specs: 55 PSI cut-out / 23 PSI cut-in | Factory-calibrated set points | OEM part number 312926-258 | Also cross-references: Sensata PS80-02-F1270, PSL 312926-258
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part with precision-calibrated set points matched to the PH15NB04800GACAA's refrigerant circuit design. Aftermarket switches often use wider pressure tolerances, risking nuisance trips or — worse — inadequate compressor protection.
• Install difficulty: 3/5 — Refrigerant system work requires an EPA 608 certified technician. Tools needed: manifold gauge set, refrigerant recovery equipment, wire crimpers, and a multimeter to verify switch continuity before reinstall. Always recover refrigerant before disconnecting the switch.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for Carrier model PH15NB04800GACAA heat pumps. Verify the 55-23# pressure rating against your unit's data plate and wiring diagram before ordering. Our fitment team is available to confirm compatibility — reach out before you order and we'll verify your application.