{"product_id":"carrier-ph12na03000gagaa-transformer-h4oyjb","title":"OEM Carrier 40VA Transformer HT01AW229 for PH12NA03000GAGAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01AW229 for Model PH12NA03000GAGAA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PH12NA03000GAGAA\u003c\/strong\u003e system. The transformer steps down line voltage from 120V to the 24V AC signal that powers the entire control circuit — including the thermostat, control board, contactors, and zone valves. When this component fails, the result is a completely unresponsive system: the thermostat goes blank, relays won't energize, and no heating or cooling can be initiated.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40 VA rating | 120V primary \/ 24V secondary | Class 2 transformer | Direct OEM replacement for part number HT01AW229\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, ensuring stable 24V output even under full control-circuit load. Undersized or off-spec generic transformers can cause nuisance tripping, erratic thermostat behavior, or premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts. Label or photograph existing wiring before disconnecting. Verify 24V output with a multimeter after installation before restoring full system 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 Engineered specifically for the Carrier \u003cstrong\u003ePH12NA03000GAGAA\u003c\/strong\u003e. Always verify your unit's data plate voltage and VA rating before ordering. If you are unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you purchase — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641958355315,"sku":"CARRIE-PH12NA03000GAGAA-TRANSFORMER-HT01AW229","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641958388083,"sku":"CARRIE-PH12NA03000GAGAA-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_c156a64b-0611-4dfc-abab-c3333d9e66d7.jpg?v=1775016509","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph12na03000gagaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}