{"product_id":"carrier-ph14nb018000aaaa-pressure-switch-1vlc9v","title":"OEM Carrier High \u0026 Low Pressure Switch Kit for PH14NB018000AAAA","description":"\u003ch1\u003eOEM Carrier High \u0026amp; Low Pressure Switch Set for Model PH14NB018000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM pressure switch listing covers both the \u003cstrong\u003ehigh pressure switch (312926-252)\u003c\/strong\u003e and \u003cstrong\u003elow pressure switch (312926-258)\u003c\/strong\u003e — the factory-specified refrigerant circuit protection components for the \u003cstrong\u003eCarrier PH14NB018000AAAA\u003c\/strong\u003e heat pump system. These switches continuously monitor refrigerant pressure on both the high and low sides of the refrigerant circuit. When pressure drifts outside safe operating limits — due to refrigerant loss, a blocked condenser coil, or a failing metering device — the corresponding switch opens, triggering a system lockout to prevent compressor damage. Common symptoms of failure include the unit going into lockout shortly after startup, fault codes indicating low or high pressure trips, or a system that short-cycles and will not resume normal operation.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e High Pressure Switch: OEM Part 312926-252 | Low Pressure Switch: OEM Part 312926-258 | Factory-calibrated trip points matched to PH14NB018000AAAA refrigerant circuit design | Spade terminal connections\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM switches use factory-calibrated pressure set points. Aftermarket alternatives often carry wider tolerances that can allow the compressor to operate outside safe pressure bands, shortening its service life significantly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 3\/5\u003c\/strong\u003e — Refrigerant circuit work requires an EPA 608-certified technician. Tools needed: manifold gauge set, needle-nose pliers, multimeter for continuity check, and torque wrench. Always recover refrigerant before disconnecting any pressure switch on the high side.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty on both switches. Orders ship same business day from our warehouse when placed before 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Both switches are direct OEM replacements for the \u003cstrong\u003eCarrier PH14NB018000AAAA\u003c\/strong\u003e heat pump. Verify your existing switch part numbers against 312926-252 (high) and 312926-258 (low) from your unit's wiring diagram or data plate before ordering. Not sure which switch you need? Our HVAC parts specialists can confirm fitment — contact us before you order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641774920051,"sku":"CARRIE-PH14NB018000AAAA-PRESSURE_SWITCH-312926-252","price":40.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641774952819,"sku":"CARRIE-PH14NB018000AAAA-PRESSURE_SWITCH-312926-252-GEN","price":35.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-312926-252_938e0878-30e4-4fb6-b088-4ac217240ee7.jpg?v=1775033063","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph14nb018000aaaa-pressure-switch-1vlc9v","provider":"National HVAC Parts","version":"1.0","type":"link"}