{"product_id":"carrier-ha1bjx024000adaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V\/24V for HA1BJX024000ADAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model HA1BJX024000ADAA\u003c\/h1\u003e\u003cp\u003eThis OEM control circuit transformer (part# \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier HA1BJX024000ADAA\u003c\/strong\u003e air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dark — your thermostat goes blank, the system won't respond to any calls for heating or cooling, and nothing works. A failed transformer is often the first suspect when a system appears completely dead with no error codes.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01AW229 | Factory-matched output for stable low-voltage control circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This factory OEM transformer is wound to exact VA and voltage tolerances required by the Carrier control board. Undersized or off-tolerance generic transformers can overload, trip the internal breaker repeatedly, or cause erratic thermostat behavior.\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, needle-nose pliers, multimeter. Label and photograph all wiring connections before removing the old transformer. 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 against defects. Orders placed by 3PM local time ship same business day from our climate-controlled parts warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed and tested for the Carrier \u003cstrong\u003eHA1BJX024000ADAA\u003c\/strong\u003e air handler. Always verify your unit's data plate voltage ratings match before installation. If you're unsure of fitment, our parts specialists can confirm compatibility before you order — no guesswork required. In stock and ready to ship today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909365125491,"sku":"CARRIE-HA1BJX024000ADAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909365158259,"sku":"CARRIE-HA1BJX024000ADAA-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_f6bc1e64-7a65-473f-87d8-39cf2084e80e.jpg?v=1782941498","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ha1bjx024000adaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}