{"product_id":"carrier-ph12na030000acaa-transformer-h4oyjb","title":"OEM Carrier Transformer 120V\/24V 40VA for PH12NA030000ACAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 120V\/24V 40VA for Model PH12NA030000ACAA\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-replacement control transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier PH12NA030000ACAA\u003c\/strong\u003e packaged heat pump unit. The transformer steps down line voltage (120V) to the 24V AC signal that powers the entire low-voltage control circuit — including the thermostat, contactor coil, reversing valve, and control board. When this transformer fails, the result is total system non-response: the thermostat goes blank or unresponsive, and neither heating nor cooling will initiate. A blown 3A fuse on the secondary side is often the first clue that the transformer has failed or is being overloaded by a wiring fault.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01AW229 | Factory-matched windings and insulation class\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to Carrier's exact VA rating and insulation specification. Generic substitutes frequently use undersized cores that run hot under peak demand, shortening service life and risking secondary fuse failure during high-load conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter (verify 24V output after install), wire nuts or push-in connectors. Always check for downstream short circuits before replacing — a shorted control wire will blow the new transformer immediately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In stock and 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 Engineered as a direct OEM drop-in for the Carrier \u003cstrong\u003ePH12NA030000ACAA\u003c\/strong\u003e packaged heat pump. Verify your unit's data plate lists 120V primary control voltage before ordering. If your system runs on 208\/240V primary, a different transformer part number is required — contact our fitment team to confirm before purchase. We verify compatibility so you get the right part the first time.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641960780147,"sku":"CARRIE-PH12NA030000ACAA-TRANSFORMER-HT01AW229","price":35.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641960812915,"sku":"CARRIE-PH12NA030000ACAA-TRANSFORMER-HT01AW229-GEN","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01AW229_bdadace2-28df-4715-8941-14cf207acbc2.jpg?v=1775040999","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph12na030000acaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}