{"product_id":"carrier-ha1bjx030000aaaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V-24V for HA1BJX030000AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model HA1BJX030000AAAA\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 HA1BJX030000AAAA\u003c\/strong\u003e. The transformer steps down line voltage (120V) to the 24V AC signal that powers your thermostat, contactor coil, and control board. When this component fails, the entire control circuit goes dead — the thermostat loses power, the system becomes completely unresponsive, and no heating or cooling function is possible. It is often the first component to check when a system shows zero response despite confirmed line voltage at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | Direct OEM replacement for part number HT01AW229 | Factory-matched output tolerance for reliable control circuit operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to Carrier's exact VA and voltage specifications. Generic transformers frequently undersell their VA capacity, causing brownouts to the control board under load and premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify zero voltage with a multimeter before proceeding. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Label or photograph all low-voltage wiring connections before removal. Verify transformer output (24V AC) with a multimeter after installation before restoring full power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as a direct OEM replacement for \u003cstrong\u003eCarrier model HA1BJX030000AAAA\u003c\/strong\u003e. Cross-reference OEM part number HT01AW229 against your unit's data plate and wiring diagram to confirm fitment. If you are unsure, our HVAC parts specialists verify compatibility before you order — just reach out before adding to cart.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909364273523,"sku":"CARRIE-HA1BJX030000AAAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909364306291,"sku":"CARRIE-HA1BJX030000AAAA-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_f63ef0b0-9317-435a-9565-4d65352c2dbb.jpg?v=1782939880","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ha1bjx030000aaaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}