{"product_id":"carrier-ph13nb03700gaaaa-pressure-switch-1vlc9v","title":"OEM Carrier High \u0026 Low Pressure Switch Kit for PH13NB03700GAAAA","description":"\u003ch1\u003eOEM Carrier High \u0026amp; Low Pressure Switch Kit — 312926-252 \u0026amp; 312926-258 for PH13NB03700GAAAA\u003c\/h1\u003e\u003cp\u003eThis factory-matched OEM pressure switch kit includes both the \u003cstrong\u003e312926-252 High Pressure Switch (670–470 PSI)\u003c\/strong\u003e and the \u003cstrong\u003e312926-258 Low Pressure Switch (55–23 PSI)\u003c\/strong\u003e, the exact components specified by Carrier for the \u003cstrong\u003ePH13NB03700GAAAA\u003c\/strong\u003e split-system heat pump. These refrigerant-side safety switches monitor system pressure in real time and cut power to the compressor circuit the instant an out-of-range condition is detected — preventing catastrophic compressor failure caused by refrigerant overcharge, loss of charge, blocked airflow, or a failing metering device. When either switch trips and fails to auto-reset, you'll typically see a hard lockout fault on the thermostat or control board, with the system failing to maintain temperature.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs — High Pressure Switch (312926-252):\u003c\/strong\u003e Cut-out 670 PSI | Auto-reset at 470 PSI | Factory Authorized Part | Direct refrigerant-circuit mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs — Low Pressure Switch (312926-258):\u003c\/strong\u003e Cut-out 55 PSI | Auto-reset at 23 PSI | Factory Authorized Part | Pre-wired leads for drop-in replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM Carrier pressure switches are calibrated to exact factory cut-out and reset pressures. Generic alternatives frequently carry wider tolerances, allowing marginal pressure conditions to go undetected and shortening compressor lifespan significantly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 3\/5\u003c\/strong\u003e — Refrigerant-side work requires an EPA 608 certification. Recover refrigerant before replacing switches. Tools needed: manifold gauge set, refrigerant recovery unit, wire strippers, multimeter. Photograph all wiring before disconnecting. Recheck system pressures after reinstallation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty on both switches. Ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003ePH13NB03700GAAAA\u003c\/strong\u003e split-system heat pump. Verify part numbers against your unit's wiring diagram and data plate before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — \u003cstrong\u003eorder now and get same-day shipping on in-stock OEM parts.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641916248435,"sku":"CARRIE-PH13NB03700GAAAA-PRESSURE_SWITCH-312926-252","price":61.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641916281203,"sku":"CARRIE-PH13NB03700GAAAA-PRESSURE_SWITCH-312926-252-GEN","price":54.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-312926-252_7d87e174-2ead-412f-9db0-aa7dff81c95a.jpg?v=1775033013","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph13nb03700gaaaa-pressure-switch-1vlc9v","provider":"National HVAC Parts","version":"1.0","type":"link"}