OEM Carrier Low Pressure Switch 312926-258 (55-23#) for Model PH16NA04800GACAA

This is the genuine OEM Carrier low pressure switch (part number 312926-258), the factory-specified replacement for the Carrier PH16NA04800GACAA heat pump. The low pressure switch monitors refrigerant pressure on the suction side of the circuit and opens the compressor control circuit any time pressure drops below the factory cutout threshold — protecting the compressor from catastrophic damage caused by low charge, refrigerant loss, or a blocked metering device. Common failure symptoms include nuisance lockouts with a fault code, compressor short-cycling, or a system that trips on a low-pressure fault immediately after startup.

• Specs: 55-23# pressure rating | Cut-out: 55 PSIG (opens) | Cut-in: 23 PSIG (closes) | Factory Authorized Parts (FAP) designation | Cross-references: Sensata PS80-02-F1270, PSL 312926-258, 300R18
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part, precision-calibrated at the factory to exact cut-out/cut-in pressures. Aftermarket switches frequently carry ±5–10% pressure tolerances, which can cause nuisance trips or, worse, fail to protect the compressor at the correct threshold.
• Install difficulty: 2/5 — System must be recovered or isolated before removal. Tools needed: adjustable wrench, refrigerant recovery equipment (EPA 608 required), wire strippers, and a multimeter to verify continuity after installation. Always confirm the system is de-energized before disconnecting leads.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PH16NA04800GACAA heat pump. Verify your existing switch's pressure ratings (cut-out/cut-in) and connector type against your unit's data plate before ordering. Questions about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today and get your system back online fast.