{"product_id":"carrier-ha1ajx036000aaaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V–24V for HA1AJX036000AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V–24V for Model HA1AJX036000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier HA1AJX036000AAAA\u003c\/strong\u003e air handler. The transformer is the heartbeat of your system's low-voltage control circuit — it converts 120V line voltage down to the 24V AC signal that powers your thermostat, contactor coil, control board, and zone valves. When this transformer fails, absolutely nothing responds: the thermostat goes blank, the system will not call for heating or cooling, and downstream components appear dead even though line voltage is present 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 | Factory-matched OEM replacement | Terminals match original wiring harness footprint\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and rated to exact factory VA specifications, ensuring stable 24V output under full load. Undersized or off-tolerance generic units can sag voltage under load, causing erratic thermostat behavior, nuisance lockouts, and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the air handler at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Photograph all low-voltage and line-voltage wiring before disconnecting. Confirm 24V output at secondary terminals after installation before closing the panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock units ship 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 Designed and factory-matched for the Carrier \u003cstrong\u003eHA1AJX036000AAAA\u003c\/strong\u003e air handler. Cross-reference OEM part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e against your unit's data plate and wiring diagram to confirm fitment. If your data plate shows a different transformer part number, contact our team — we verify fitment before you order so you never buy the wrong part.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909369811315,"sku":"CARRIE-HA1AJX036000AAAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909369844083,"sku":"CARRIE-HA1AJX036000AAAA-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_62b392c6-d9a8-4347-9fba-9ab3fae1afb7.jpg?v=1782941933","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ha1ajx036000aaaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}