{"product_id":"carrier-ph13nb042000aaaa-pressure-switch-1vlc9v","title":"OEM Carrier High \u0026 Low Pressure Switch Kit for PH13NB042000AAAA","description":"\u003ch1\u003eOEM Carrier High \u0026amp; Low Pressure Switch Kit — 312926-252 \u0026amp; 312926-258 for PH13NB042000AAAA\u003c\/h1\u003e\u003cp\u003eThese two OEM pressure switches are the factory-specified replacements for the \u003cstrong\u003eCarrier PH13NB042000AAAA\u003c\/strong\u003e heat pump. The \u003cstrong\u003ehigh pressure switch (312926-252, 670\/470 PSI)\u003c\/strong\u003e monitors refrigerant discharge pressure and opens the safety circuit if pressure exceeds safe operating limits, protecting the compressor from damage due to overcharge, blocked condenser airflow, or a failed condenser fan motor. The \u003cstrong\u003elow pressure switch (312926-258, 55\/23 PSI)\u003c\/strong\u003e monitors suction-side pressure and opens the circuit under low-charge or freeze conditions, preventing the compressor from running in a damaging vacuum. When either switch fails, symptoms typically include nuisance lockouts, fault codes indicating high or low pressure trips, or a system that short-cycles and shuts down within seconds of startup.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Numbers \u0026amp; Specs:\u003c\/strong\u003e 312926-252 High Pressure Switch — 670 PSI cut-out \/ 470 PSI cut-in | 312926-258 Low Pressure Switch — 55 PSI cut-out \/ 23 PSI cut-in | Both are \u003cstrong\u003eCarrier Factory Authorized Parts (FAP)\u003c\/strong\u003e meeting OEM tolerances\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are factory-calibrated to exact cut-in\/cut-out setpoints. Aftermarket substitutes often carry wider pressure tolerances, which can allow unsafe operating conditions or cause repeated nuisance trips — risking compressor burnout over time.\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, multimeter, wire stripper, and 1\/4\" flare fittings. Always recover refrigerant before replacing a pressure switch inline with the refrigerant circuit. Confirm electrical connections match the original wiring diagram inside the unit access panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty. Both units ship same business day from our warehouse, individually packaged and ready to install.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as direct OEM replacements for Carrier model \u003cstrong\u003ePH13NB042000AAAA\u003c\/strong\u003e heat pump systems. Verify refrigerant type and system operating pressures against your unit's data plate before ordering. Unsure about fitment? Our HVAC parts specialists confirm compatibility before you buy — order today and get same-day shipping.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641915920755,"sku":"CARRIE-PH13NB042000AAAA-PRESSURE_SWITCH-312926-252","price":59.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641915953523,"sku":"CARRIE-PH13NB042000AAAA-PRESSURE_SWITCH-312926-252-GEN","price":52.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-312926-252_1c2754cd-ddb8-4f3d-bed3-806fb29a3f0a.jpg?v=1775033016","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph13nb042000aaaa-pressure-switch-1vlc9v","provider":"National HVAC Parts","version":"1.0","type":"link"}