OEM Carrier Low Pressure Switch 312926-258 (55-23#) for Model PH16NC03600GBAAA

This is the genuine OEM Carrier low pressure switch (part number 312926-258), factory-specified for the Carrier PH16NC03600GBAAA heat pump system. The low pressure switch continuously monitors refrigerant pressure on the suction side of the refrigerant circuit. When system pressure drops below the factory-set threshold, the switch opens the control circuit, preventing the compressor from operating under dangerous low-refrigerant or low-pressure conditions. A failed pressure switch commonly causes symptoms including compressor lockout, a system that trips immediately on startup, or an error code indicating a low-pressure fault on the control board.

• Specs: 55-23# pressure rating | Factory-set cut-out at low pressure | Brass inlet connector | Precision-calibrated diaphragm | Pre-wired color-coded leads for fast installation
• OEM vs Generic: This OEM switch is factory-calibrated to exact cut-in/cut-out pressure specifications for the PH16NC03600GBAAA. Aftermarket substitutes may use looser tolerances, leading to nuisance trips or — worse — inadequate compressor protection that shortens system life.
• Install difficulty: 2/5 — Recovery of system refrigerant is required before removing the pressure switch. Tools needed: refrigerant recovery equipment, adjustable wrench, multimeter for continuity verification. Always lock out/tag out the unit before servicing. Recommend a licensed HVAC technician for this repair.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered as the direct OEM replacement for Carrier model PH16NC03600GBAAA. Always verify the part number on your existing switch and cross-reference with your unit's data plate before ordering. Not sure if this is the right part? Our fitment team is available to confirm compatibility before you buy — same-day shipping available on in-stock orders.