OEM Carrier Low Pressure Switch 312926-258 (55-23#) for Model PH14NB03600GAAAA

This is the genuine OEM low pressure switch (part number 312926-258) factory-specified for the Carrier PH14NB03600GAAAA heat pump. The low pressure switch continuously monitors refrigerant suction-side pressure during operation. When pressure drops below the factory-set threshold — due to refrigerant loss, a restricted filter drier, or a failing metering device — the switch opens the control circuit, cutting power to the compressor to prevent catastrophic damage. Symptoms of a failed low pressure switch include the system failing to start, the compressor short-cycling, or a persistent low-pressure lockout fault code on the thermostat or control board.

• Specs: 55-23# pressure rating | Factory-calibrated open/close set points | Brass inlet connector | Pre-wired color-coded leads for fast connection | OEM part number 312926-258
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part — not an aftermarket substitute. OEM switches are precision-calibrated to exact set points. Off-brand alternatives often have wide tolerances that allow compressors to run under unsafe low-pressure conditions, leading to premature compressor failure.
• Install difficulty: 2/5 — Always recover and reclaim refrigerant before disconnecting the low-side service port. Tools needed: manifold gauge set, adjustable wrench, and a multimeter to verify switch continuity before reinstalling. Photograph wiring connections before removal. Refrigerant work requires EPA 608 certification.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Designed for the Carrier PH14NB03600GAAAA heat pump. Always verify your unit's data plate and existing switch rating before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before you buy — call or chat today. Orders placed before 3PM ship same day.