OEM Carrier Low Pressure Switch 55-23# (312926-258) for Model PH15NB03600GACAA

This is the genuine OEM factory-replacement low pressure switch for the Carrier PH15NB03600GACAA heat pump. The low pressure switch continuously monitors refrigerant pressure on the low side of the refrigerant circuit. When pressure drops below the factory-set threshold — due to a refrigerant leak, restricted metering device, or loss of charge — the switch opens and interrupts the compressor circuit, protecting the system from catastrophic damage. Common failure symptoms include the compressor refusing to start, the unit going into lockout mode, or a fault code indicating a low-pressure trip event.

• Part Specs: OEM Part # 312926-258 | 55-23# pressure rating (opens at 55 PSI, resets at 23 PSI) | Factory-calibrated set points | Pre-wired leads for direct plug-in installation
• OEM vs Generic: This is a genuine Carrier factory-authorized part, ensuring exact pressure set-point calibration. Aftermarket switches often carry ±5–10% pressure tolerances, which can cause nuisance trips or, worse, fail to protect the compressor under true low-charge conditions.
• Install Difficulty: 3/5 — Refrigerant recovery is required before replacing this switch on a live system. Tools needed: manifold gauge set, adjustable wrench, multimeter, and refrigerant recovery equipment. Always verify the system is in a recovered or isolated state before disconnecting the switch. A licensed HVAC technician is recommended.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PH15NB03600GACAA heat pump. Verify your existing switch's pressure rating against the data plate or wiring diagram before ordering — confirm the 55-23# set points match. Have questions about fitment? Our HVAC parts specialists verify compatibility before you order — call or chat today. In stock and ships today.