{"product_id":"carrier-ch13na03700gacaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V\/24V for CH13NA03700GACAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model CH13NA03700GACAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier CH13NA03700GACAA\u003c\/strong\u003e split-system air conditioner. The transformer steps down 120V line voltage to the 24V signal voltage required to power the thermostat, contactor coil, and all low-voltage control circuits. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system will not respond to any calls for cooling or heating, and no components will energize. A failed transformer is often mistaken for a bad control board or thermostat, so always verify 24V output at the secondary terminals before replacing more expensive components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input: 120V AC | Output: 24V AC | VA Rating: 40VA | OEM Part Number: HT01AW229 | Replaces factory-installed unit exactly\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 class, ensuring reliable 24V output under full control circuit load. Generic transformers may be under-rated in VA, causing overheating, nuisance tripping of the internal thermal fuse, and premature failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all wire connections before removal and verify 24V output after installation before closing the cabinet.\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.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as a direct OEM replacement for Carrier model \u003cstrong\u003eCH13NA03700GACAA\u003c\/strong\u003e. Verify your unit's data plate confirms 120V\/24V control circuit configuration before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — order with confidence today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909631824243,"sku":"CARRIE-CH13NA03700GACAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909631857011,"sku":"CARRIE-CH13NA03700GACAA-TRANSFORMER-HT01AW229-GEN","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-HT01AW229_0b5abbb4-5055-4272-bc87-f551fe9fce50.jpg?v=1782940764","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ch13na03700gacaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}