OEM Carrier Low Pressure Switch 55-23# (312926-258) for Model PH15NB03000GACAA

This is the factory OEM low pressure switch for the Carrier PH15NB03000GACAA heat pump. The low pressure switch continuously monitors refrigerant pressure on the suction side of the system. When pressure drops below the factory-set threshold — due to low refrigerant charge, a blocked filter, or a failing metering device — the switch opens its circuit and shuts down the compressor to prevent catastrophic damage. Typical failure symptoms include: compressor lockout on a call for cooling or heating, short-cycling (system starts and stops within seconds), or a fault code indicating low-pressure trip on the control board.

• Specs: 55-23# pressure rating | Brass inlet connector | Precision-calibrated diaphragm | Pre-wired color-coded leads | Factory-matched OEM tolerances
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part (FAP). OEM switches are factory-calibrated to exact cut-in/cut-out pressures. Generic alternatives can drift out of spec, causing nuisance trips or — worse — failing to protect the compressor when pressure truly drops.
• Install difficulty: 2/5 — Recover refrigerant before disconnecting the switch from the refrigerant circuit. Tools needed: manifold gauge set, recovery machine, wire connectors or crimper. Always verify system charge after reinstallation and leak-check the port. Not a DIY repair in most jurisdictions — EPA 608 certification required for refrigerant handling.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse. Free shipping on qualifying orders.

Compatibility: Designed for the Carrier PH15NB03000GACAA heat pump. Cross-references: Sensata PS80-02-F1270, PSL 312926-258, 300R18. Always verify the part number on your unit's wiring diagram or data plate before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions.