{"product_id":"carrier-ph14nb042000aaaa-pressure-switch-1vlc9v","title":"OEM Carrier High \u0026 Low Pressure Switch Kit for PH14NB042000AAAA","description":"\u003ch1\u003eOEM Carrier High \u0026amp; Low Pressure Switch Kit 312926-252 \/ 312926-258 for Model PH14NB042000AAAA\u003c\/h1\u003e\u003cp\u003eThese two OEM Carrier pressure switches are the factory-specified refrigerant safety controls for the \u003cstrong\u003eCarrier PH14NB042000AAAA\u003c\/strong\u003e heat pump. The \u003cstrong\u003ehigh pressure switch (312926-252, 670\/470 PSI)\u003c\/strong\u003e monitors refrigerant discharge pressure and trips the compressor offline if pressure exceeds safe operating limits — protecting the compressor from catastrophic over-pressure failure. The \u003cstrong\u003elow pressure switch (312926-258, 55\/23 PSI)\u003c\/strong\u003e guards against low-charge or loss-of-refrigerant conditions by cutting compressor power before pressures drop to a damaging level. When either switch fails or trips without resetting, the system typically enters a hard lockout: the unit will not start, the thermostat call goes unanswered, and fault codes pointing to high- or low-pressure lockout appear on the control board.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Numbers \u0026amp; Specs:\u003c\/strong\u003e High Pressure Switch — OEM #312926-252 | Cut-out: 670 PSI \/ Cut-in: 470 PSI | Low Pressure Switch — OEM #312926-258 | Cut-out: 55 PSI \/ Cut-in: 23 PSI | Factory Authorized Parts, Carrier Corporation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e These are genuine Carrier Factory Authorized Parts (FAP) with precision-calibrated diaphragms and exact PSI set points. Generic aftermarket switches often carry ±10–15% pressure tolerances, risking nuisance trips or, worse, failing to protect the compressor at the correct threshold.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 3\/5\u003c\/strong\u003e — Refrigerant circuit work requires an EPA Section 608 certified technician. Recover refrigerant before removing switches. Tools needed: manifold gauge set, refrigerant recovery unit, adjustable wrench, multimeter for continuity verification. Photograph existing wiring before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty. Ships same business day from our warehouse. Free shipping on orders over $99.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as direct OEM replacements for \u003cstrong\u003eCarrier PH14NB042000AAAA\u003c\/strong\u003e heat pump units. Always verify refrigerant type, cut-in\/cut-out PSI ratings, and connector type against your unit's data plate before ordering. Not sure? Our HVAC parts specialists verify fitment before you buy — order today and get it shipped out the same business day.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641752703347,"sku":"CARRIE-PH14NB042000AAAA-PRESSURE_SWITCH-312926-252","price":66.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641752736115,"sku":"CARRIE-PH14NB042000AAAA-PRESSURE_SWITCH-312926-252-GEN","price":58.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-312926-252_7cec8ff9-fb00-4a1e-995d-6876a319333d.jpg?v=1775033080","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph14nb042000aaaa-pressure-switch-1vlc9v","provider":"National HVAC Parts","version":"1.0","type":"link"}