{"product_id":"carrier-ph3zpa030000aa-transformer-h3025m","title":"OEM Carrier Control Transformer 40VA 120V\/24V for PH3ZPA030000AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model PH3ZPA030000AA\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM control circuit transformer for the \u003cstrong\u003eCarrier PH3ZPA030000AA\u003c\/strong\u003e packaged heat pump unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage switching circuits. When this part fails, the entire control circuit goes dead — your thermostat becomes unresponsive, the system won't heat or cool, and no fault codes will display because the board itself has lost power.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA output rating | 120V primary \/ 24V secondary | OEM part number HT01BD242 | Factory-matched for Carrier PH3ZPA030000AA packaged heat pump\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact factory VA and voltage tolerances, protecting sensitive control boards from voltage sag or overvoltage that undersized generic transformers can cause — especially under heavy accessory loads like zone boards or humidifiers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Photograph or label all low-voltage wiring before disconnecting. Confirm 24V output across secondary terminals with a multimeter before restoring full power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003ePH3ZPA030000AA\u003c\/strong\u003e packaged heat pump. Verify transformer VA rating and primary voltage on your unit's data plate before ordering — some configurations may use a different VA rating. Our fitment team is available to confirm compatibility before you buy. Order today for same-day shipping and get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641326981491,"sku":"CARRIE-PH3ZPA030000AA-TRANSFORMER-HT01BD242","price":35.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641327014259,"sku":"CARRIE-PH3ZPA030000AA-TRANSFORMER-HT01BD242-GEN","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD242_3031c2b4-7409-46a4-8d9a-3cd4bb1857c8.jpg?v=1775025393","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph3zpa030000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}