{"product_id":"carrier-ha1ajx024000aaaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V\/24V for HA1AJX024000AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model HA1AJX024000AAAA\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 HA1AJX024000AAAA\u003c\/strong\u003e air handler. The transformer steps down 120V line voltage to the 24V signal voltage required to power the thermostat, control board, contactor coil, and all low-voltage components. When the transformer fails, absolutely nothing in the system responds — the thermostat goes blank, the unit will not call for heating or cooling, and no safety controls can operate. It is often the first component to suspect when the 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 tolerance for reliable control circuit performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM Carrier transformer delivers the exact VA rating and voltage regulation the HA1AJX024000AAAA control board requires. Undersized or off-tolerance generic transformers can cause nuisance lockouts, erratic thermostat behavior, and premature control board 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, needle-nose pliers, multimeter to confirm 24V output after installation. Label or photograph all low-voltage wiring connections before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eHA1AJX024000AAAA\u003c\/strong\u003e air handler. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or existing transformer label before ordering. If you have any questions about fitment, our HVAC parts specialists confirm compatibility before you buy — no guesswork.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909371285875,"sku":"CARRIE-HA1AJX024000AAAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909371318643,"sku":"CARRIE-HA1AJX024000AAAA-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_08a35229-6836-4af1-a7e9-4e21cbe15936.jpg?v=1782941480","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ha1ajx024000aaaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}