{"product_id":"carrier-ph3ana018000bbaa-pressure-switch-1vlc9v","title":"OEM Carrier High \u0026 Low Pressure Switch Kit for PH3ANA018000BBAA","description":"\u003ch1\u003eOEM Carrier High \u0026amp; Low Pressure Switch Kit (312926-252 \u0026amp; 312926-258) for Model PH3ANA018000BBAA\u003c\/h1\u003e\u003cp\u003eThis factory-matched OEM pressure switch kit contains both the \u003cstrong\u003eHigh Pressure Switch (312926-252, rated 670\/470 PSI)\u003c\/strong\u003e and the \u003cstrong\u003eLow Pressure Switch (312926-258, rated 55\/23 PSI)\u003c\/strong\u003e for the Carrier \u003cstrong\u003ePH3ANA018000BBAA\u003c\/strong\u003e packaged heat pump unit. Pressure switches are critical refrigerant-circuit safety controls: the high-pressure switch opens when system pressure exceeds the safe upper threshold, shutting down the compressor to prevent catastrophic failure; the low-pressure switch opens when pressure drops too low — caused by a refrigerant leak, blocked metering device, or dirty filter — protecting the compressor from running in a starved-refrigerant condition. Symptoms of failure include sudden system lockout, error codes on the thermostat or control board, short cycling, or a unit that starts briefly then shuts off within seconds.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs — High Pressure Switch (312926-252):\u003c\/strong\u003e Cut-out 670 PSI | Cut-in 470 PSI | Factory Authorized OEM Part | Replaces: 312926252\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs — Low Pressure Switch (312926-258):\u003c\/strong\u003e Cut-out 55 PSI | Cut-in 23 PSI | Factory Authorized OEM Part | Sensata \/ Wilspec compatible cross-reference\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM switches are factory-calibrated to exact PSI setpoints for the PH3ANA018000BBAA refrigerant circuit. Generic alternatives can carry ±10–15% PSI tolerance, risking nuisance trips or — more dangerously — failure to trip when needed, leading to compressor damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 3\/5\u003c\/strong\u003e — Refrigerant circuit work requires EPA 608 certification. Always recover refrigerant before opening the circuit. Tools needed: manifold gauge set, recovery machine, torque wrench, multimeter. Photograph all wiring before disconnecting. Test system pressures after replacement to confirm proper setpoint operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty. Ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e This kit is designed for the Carrier \u003cstrong\u003ePH3ANA018000BBAA\u003c\/strong\u003e packaged heat pump. Verify part numbers 312926-252 and 312926-258 against your unit's wiring diagram and data plate before ordering. Our fitment team is available to confirm compatibility before you buy — order with confidence and get back up and running fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641446060403,"sku":"CARRIE-PH3ANA018000BBAA-PRESSURE_SWITCH-312926-252","price":139.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641446093171,"sku":"CARRIE-PH3ANA018000BBAA-PRESSURE_SWITCH-312926-252-GEN","price":122.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-312926-252_871f4f5a-3ef0-483a-805a-a296ac8e0704.jpg?v=1775033146","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph3ana018000bbaa-pressure-switch-1vlc9v","provider":"National HVAC Parts","version":"1.0","type":"link"}