OEM Carrier Low Pressure Switch 55-23# (312926-258) for Model PH16NA02400GACAA

This OEM low pressure switch (part number 312926-258) is the factory-specified replacement for the Carrier PH16NA02400GACAA heat pump system. The low pressure switch continuously monitors refrigerant pressure on the suction side of the system. When pressure drops below the factory setpoint — due to a refrigerant leak, a restricted metering device, or an evaporator airflow issue — the switch opens and cuts power to the compressor, preventing catastrophic damage. Common failure symptoms include the system going into lockout shortly after startup, the compressor short-cycling, or the unit running but producing no cooling or heating effect.

• Specs: 55-23# low pressure switch | Activation (open): 0.5" W.C. | Deactivation (close): 0.75" W.C. | Brass inlet connector | Precision-calibrated diaphragm | Pre-wired with color-coded leads
• OEM vs Generic: This is a genuine Carrier OEM part manufactured to exact factory calibration tolerances. Generic switches often ship with imprecise setpoints, causing nuisance lockouts or — worse — failing to protect the compressor under genuinely low-pressure conditions.
• Install difficulty: 2/5 — Recover system refrigerant before disconnecting the switch (EPA Section 608 required). Tools needed: refrigerant recovery unit, manifold gauge set, adjustable wrench, multimeter. Label and photograph wiring before removal. Recharge system to manufacturer spec after installation.
• Warranty: 1-year OEM factory warranty. Ships same business day from our climate-controlled warehouse.

Compatibility: Designed for the Carrier PH16NA02400GACAA heat pump. Verify your unit's data plate and existing switch markings before ordering. Cross-references include Sensata PS80-02-F1270 (55-23). Our parts team is available to confirm fitment before you buy — no guesswork required. Order today and get same-day shipping on all in-stock OEM parts.