OEM Carrier Low Pressure Switch 55-23# (312926-258) for Model PH16NC04800GBAAA

This is the genuine OEM low pressure switch for the Carrier PH16NC04800GBAAA heat pump. The low pressure switch continuously monitors refrigerant circuit pressure and acts as a safety guardian for your compressor. When suction-side pressure drops below the factory-set threshold — typically caused by low refrigerant charge, a refrigerant leak, or a blocked metering device — the switch opens the control circuit and locks out the compressor before catastrophic damage can occur. Common failure symptoms include: the system short-cycling or going into lockout, a fault code indicating low-pressure trip, or the unit failing to cool or heat despite the fan running normally.

• Specs: 55-23# pressure rating | OEM part number 312926-258 | Brass inlet connector | Precision-calibrated diaphragm | Pre-wired color-coded leads for direct plug-in replacement
• OEM vs Generic: This is a factory-authorized Carrier OEM part — identical to what was installed at the factory. Generic aftermarket switches frequently carry wider pressure tolerances, risking nuisance trips or, worse, failing to protect the compressor at the correct threshold. OEM is always the recommended choice for refrigerant-circuit safety switches.
• Install difficulty: 3/5 — Refrigerant system work must be performed by an EPA 608-certified technician. Tools needed: manifold gauge set, refrigerant recovery equipment, adjustable wrench, multimeter. Always recover refrigerant before disconnecting the switch. Verify system pressure and charge after reinstallation before restoring power.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for Carrier PH16NC04800GBAAA heat pump condensing units. Verify the part number on your existing switch before ordering, as pressure ratings vary by model variant. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — reach out today and get your system back online fast.