OEM Carrier Low Pressure Switch 55-23# (312926-258) for Model PH16NC02400GABAA

This is the genuine OEM low pressure switch (part number 312926-258) factory-specified for the Carrier PH16NC02400GABAA heat pump. The low pressure switch continuously monitors refrigerant pressure on the low side of the system and opens the control circuit if pressure drops below a safe threshold — cutting power to the compressor before catastrophic damage can occur. When this switch fails or loses calibration, the most common symptoms are a system that won't start, a compressor that short-cycles within minutes of startup, or a fault code indicating a low pressure lockout condition. Replacing it with the correct OEM part restores factory-calibrated protection and eliminates nuisance trips caused by a faulty switch rather than an actual refrigerant issue.

• Specs: 55 PSI cut-in / 23 PSI cut-out | Factory-calibrated diaphragm | Brass inlet connector | Pre-wired color-coded leads | Sensata PS80-02-F1270 platform
• OEM vs Generic: This genuine Carrier OEM switch is precision-calibrated at the factory. Generic alternatives frequently have wider pressure tolerances, leading to false trips or — worse — failure to open under genuine low-pressure conditions, risking compressor burnout.
• Install difficulty: 3/5 — Refrigerant system work requires EPA 608 certification. Tools needed: manifold gauge set, adjustable wrench, multimeter for continuity verification, and wire terminals. Always recover refrigerant to safe working pressure before disconnecting the switch.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Direct OEM replacement for Carrier PH16NC02400GABAA heat pumps. Verify the 55-23# pressure rating against your unit's data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before you buy — call or chat now. In stock and ships today.