{"product_id":"carrier-ph3ana042000baaa-pressure-switch-1vlc9v","title":"OEM Carrier High Pressure Switch 670\/470 PSI — PH3ANA042000BAAA","description":"\u003ch1\u003eOEM Carrier High Pressure Switch 670\/470 PSI for Model PH3ANA042000BAAA\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM Carrier high pressure switch (part number \u003cstrong\u003e312926-252\u003c\/strong\u003e), factory-specified for the \u003cstrong\u003eCarrier PH3ANA042000BAAA\u003c\/strong\u003e packaged heat pump system. The high pressure switch is a critical refrigerant-circuit safety device: it continuously monitors the high-side refrigerant pressure and opens the control circuit to shut down the compressor the moment pressure exceeds the safe threshold — protecting the compressor, condenser coil, and refrigerant lines from catastrophic over-pressurization damage. When this switch fails or trips and won't reset, symptoms include a system that locks out immediately on startup, a compressor that cycles off within seconds, or a system that won't run at all while displaying a high-pressure fault code.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Cut-out pressure 670 PSIG | Auto-reset cut-in pressure 470 PSIG | OEM part number 312926-252 | Factory-certified replacement for Carrier PH3ANA042000BAAA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM part engineered to exact factory pressure tolerances. Off-brand switches often carry wider PSI tolerances, risking nuisance trips or — worse — failure to trip under true over-pressure conditions, which can destroy the compressor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Requires EPA 608 certification to work on the refrigerant circuit. Before replacement, recover refrigerant and verify the root cause of the high-pressure fault (blocked condenser coil, overcharge, or failed condenser fan motor). Tools needed: manifold gauge set, refrigerant recovery equipment, adjustable wrench, leak detector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for the Carrier \u003cstrong\u003ePH3ANA042000BAAA\u003c\/strong\u003e packaged heat pump. Always verify part number 312926-252 against your unit's data plate and wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment — order today for same-day shipping.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641426694515,"sku":"CARRIE-PH3ANA042000BAAA-PRESSURE_SWITCH-312926-252","price":61.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641426727283,"sku":"CARRIE-PH3ANA042000BAAA-PRESSURE_SWITCH-312926-252-GEN","price":53.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-312926-252_3738e5bf-207f-4e25-99de-9bdd2c963250.jpg?v=1775033538","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph3ana042000baaa-pressure-switch-1vlc9v","provider":"National HVAC Parts","version":"1.0","type":"link"}