OEM Carrier Low Pressure Switch 55-23# (312926-258) for Model PH16NA06000GACAA

This is the genuine OEM factory-specified low pressure switch for the Carrier PH16NA06000GACAA heat pump. The low pressure switch (part number 312926-258) continuously monitors refrigerant pressure on the low side of the refrigerant circuit. When suction-side pressure drops below the factory-calibrated threshold — typically caused by low refrigerant charge, a blocked metering device, or a failed TXV — the switch opens the compressor control circuit, triggering a system lockout and protecting the compressor from damage due to oil starvation or slugging. Symptoms of a failed or tripped low pressure switch include the system going into lockout after a short run cycle, a fault code on the control board, or the compressor refusing to energize even with adequate refrigerant charge.

• Specs: 55-23# pressure rating | Normally closed (N.C.) contact configuration | Factory-calibrated cutout/cut-in set points | Pre-wired leads for direct OEM plug-in connection | Sensata / Factory Authorized Parts assembly
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part (FAP), manufactured to exact OEM tolerances. Aftermarket substitutes often carry wider pressure tolerances (±5 PSI or more), risking nuisance lockouts or — worse — inadequate compressor protection under true low-pressure fault conditions.
• Install difficulty: 2/5 — Recover all refrigerant before opening the low-side circuit. Tools needed: manifold gauge set, refrigerant recovery machine, adjustable wrench, and a multimeter to verify switch continuity before reinstalling. Always replace the Schrader valve core or O-ring on the low-side port during service.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered for the Carrier PH16NA06000GACAA residential split-system heat pump. Verify the 55-23# pressure rating and connector lead configuration against your unit's data plate and wiring diagram before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you check out — no guesswork required.