OEM Carrier 55-23# Low Pressure Switch (312926-258) for Model PH13PA048000ABAA

This is the factory OEM low pressure switch for the Carrier PH13PA048000ABAA heat pump. The low pressure switch continuously monitors refrigerant circuit pressure on the suction side of the system. When refrigerant pressure drops below the factory-set threshold — caused by a refrigerant leak, blocked filter drier, or restricted metering device — the switch opens the control circuit, cutting power to the compressor to prevent catastrophic damage. Common symptoms of a failed low pressure switch include a system that short-cycles immediately after startup, a compressor that won't engage, or fault codes indicating a low-pressure lockout condition.

• Specs: 55-23# pressure rating | Brass inlet connector | Precision-calibrated diaphragm | Pre-wired leads for direct connection | OEM Part Number: 312926-258
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part (FAP), manufactured to exact factory pressure cut-in/cut-out tolerances. Generic substitutes often carry wider pressure tolerances that can allow the compressor to run under unsafe low-pressure conditions, risking compressor failure.
• Install Difficulty: 3/5 — Refrigerant must be safely recovered before disconnecting the pressure switch from the refrigerant circuit. Tools needed: manifold gauge set, refrigerant recovery equipment, adjustable wrench, multimeter. Always follow EPA 608 regulations when handling refrigerants. Verify polarity on wiring leads before energizing.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for the Carrier PH13PA048000ABAA heat pump. Also cross-references Sensata PS80-02-F1270 and Factory Authorized Parts designation PSL 312926-258. Verify your unit's data plate and wiring diagram before ordering to confirm this is the low-side switch. Questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — reach out before placing your order.