{"product_id":"carrier-ph4ang018000baaa-pressure-switch-1vlc9v","title":"OEM Carrier High Pressure Switch 670-470 PSI — PH4ANG018000BAAA","description":"\u003ch1\u003eOEM Carrier High Pressure Switch 670\/470 PSI for Model PH4ANG018000BAAA\u003c\/h1\u003e\u003cp\u003eThis OEM high pressure switch (part# \u003cstrong\u003e312926-252\u003c\/strong\u003e) is the factory-specified safety control replacement for the \u003cstrong\u003eCarrier PH4ANG018000BAAA\u003c\/strong\u003e packaged heat pump unit. The high pressure switch continuously monitors refrigerant circuit pressure and opens the control circuit whenever system pressure exceeds safe operating thresholds — protecting the compressor from catastrophic over-pressurization damage. When this switch fails or trips without resetting, common symptoms include the system locking out on a high-pressure fault, the compressor shutting down unexpectedly, or the unit failing to cool or heat entirely. Always verify whether nuisance tripping is caused by a failed switch or an underlying refrigerant charge or airflow issue before replacing.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Cut-out: 670 PSI | Cut-in (reset): 470 PSI | Factory-matched trip points | SPST normally-closed configuration | Rated for R-410A refrigerant systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM part built to exact factory trip-point tolerances. Aftermarket switches can drift outside calibrated PSI thresholds, risking either nuisance lockouts or — more dangerously — failure to protect the compressor under true over-pressure conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Refrigerant circuit work must be performed by an EPA Section 608 certified technician. Tools needed: manifold gauge set, torque wrench, leak detector. Always recover refrigerant before opening the high-side circuit. Photograph and label wiring before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003ePH4ANG018000BAAA\u003c\/strong\u003e packaged heat pump. Verify the 670\/470 PSI trip-point rating on your unit's existing switch or service manual before ordering. Cross-reference part number \u003cstrong\u003e312926-252\u003c\/strong\u003e to confirm fitment. Have questions? Our HVAC parts specialists verify compatibility before you order — reach out via chat or phone. \u003cstrong\u003eIn stock and ships today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641310433651,"sku":"CARRIE-PH4ANG018000BAAA-PRESSURE_SWITCH-312926-252","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641310466419,"sku":"CARRIE-PH4ANG018000BAAA-PRESSURE_SWITCH-312926-252-GEN","price":38.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-312926-252_750de6c5-1d68-4263-946d-1c5ed8691fb1.jpg?v=1775033477","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph4ang018000baaa-pressure-switch-1vlc9v","provider":"National HVAC Parts","version":"1.0","type":"link"}