{"product_id":"carrier-ph15nb03700gbbaa-pressure-switch-1vlc9v","title":"OEM Carrier Low Pressure Switch 55-23# for PH15NB03700GBBAA","description":"\u003ch1\u003eOEM Carrier Low Pressure Switch 55-23# (312926-258) for Model PH15NB03700GBBAA\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM low pressure switch (part number \u003cstrong\u003e312926-258\u003c\/strong\u003e), the factory-specified replacement for the \u003cstrong\u003eCarrier PH15NB03700GBBAA\u003c\/strong\u003e 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 metering device, or a failing TXV — this switch opens the circuit and shuts down the compressor to prevent catastrophic damage. Common symptoms of a failed low pressure switch include the system going into lockout shortly after startup, error codes indicating a low pressure fault, or the compressor refusing to energize at all.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 55-23# pressure rating | Factory-calibrated setpoints | Brass inlet connector | Precision-machined diaphragm | Pre-wired color-coded leads for direct swap\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier Factory Authorized Part (FAP), manufactured to exact OEM tolerances. Aftermarket switches often use inferior diaphragm materials and drift off calibration over time, risking nuisance trips or — worse — compressor damage from undetected low pressure events.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always recover refrigerant per EPA Section 608 before disconnecting pressure switches. Tools needed: refrigerant recovery machine, manifold gauge set, wire terminals or crimping tool, multimeter for continuity verification post-install. Photograph all wiring before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In stock and ships same business day from our NationalHVACParts.com warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for Carrier model \u003cstrong\u003ePH15NB03700GBBAA\u003c\/strong\u003e heat pump systems. Verify your existing switch's pressure rating (55-23#) against your unit's data plate or wiring diagram before ordering. Our technical team is available to confirm fitment — contact us before you buy if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641668292979,"sku":"CARRIE-PH15NB03700GBBAA-PRESSURE_SWITCH-312926-258","price":74.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641668325747,"sku":"CARRIE-PH15NB03700GBBAA-PRESSURE_SWITCH-312926-258-GEN","price":65.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-312926-258_3474ef4f-5976-4d45-88ef-daf733ac3786.jpg?v=1775036342","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph15nb03700gbbaa-pressure-switch-1vlc9v","provider":"National HVAC Parts","version":"1.0","type":"link"}