OEM Carrier Low Pressure Switch 55-23# for Model PH15NB01800GACAA

This is the genuine OEM low pressure switch (part number 312926-258), factory-specified for the Carrier PH15NB01800GACAA heat pump. The low pressure switch continuously monitors refrigerant pressure on the suction side of the system. When pressure drops below the factory set point — caused by a refrigerant leak, a blocked metering device, or a failing expansion valve — the switch opens the control circuit, cutting power to the compressor to prevent catastrophic damage. Common symptoms of a failed low pressure switch include the compressor refusing to start, the system locking out on a fault code, or the unit cycling off shortly after startup with no cooling or heating output.

• Specs: 55-23# pressure rating | Factory-calibrated cut-out/cut-in set points | Brass inlet connector | Precision-calibrated diaphragm | Pre-wired color-coded leads for drop-in replacement
• OEM vs Generic: This is a genuine Carrier factory-authorized part, manufactured to exact cut-out and cut-in tolerances. Aftermarket substitutes may trip at incorrect pressures, causing nuisance lockouts or — worse — failing to protect the compressor under a true low-pressure fault condition.
• Install difficulty: 2/5 — Recover all refrigerant before disconnecting the switch (EPA Section 608 required). Tools needed: manifold gauge set, adjustable wrench, multimeter. Confirm continuity across terminals before recharging the system.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Designed as the factory-direct replacement for Carrier model PH15NB01800GACAA. Verify part number 312926-258 against your unit's wiring diagram or data plate before ordering. Our HVAC parts specialists are available to confirm fitment — order with confidence and get your system back online fast.