{"product_id":"carrier-hb1ajx024000aaaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V-24V for HB1AJX024000AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V Control Circuit for Model HB1AJX024000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eHB1AJX024000AAAA\u003c\/strong\u003e air handler unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage control wiring. When this component fails, the entire control circuit goes dark — you'll see a blank thermostat display, no response from the system, or a tripped low-voltage fuse with no obvious short present. It is often the first component to inspect when nothing works but the breaker is fine.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | Class 2 transformer | OEM part number HT01AW229 | Factory-matched windings for stable control voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine Carrier OEM transformer, wound to exact VA and voltage specifications. Generic substitutes frequently run outside ±5% voltage tolerance, causing nuisance lockouts, board resets, or premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the breaker and verify zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Photograph all wiring connections before disconnecting leads. Reconnect primary (line) and secondary (24V) wires to matching terminals and restore power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before cutoff ship the same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for Carrier model \u003cstrong\u003eHB1AJX024000AAAA\u003c\/strong\u003e air handler units. Confirm your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate or wiring diagram before ordering. If you have any fitment questions, our HVAC parts specialists will verify compatibility before your order ships — same-day service guaranteed on in-stock parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909352444275,"sku":"CARRIE-HB1AJX024000AAAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909352477043,"sku":"CARRIE-HB1AJX024000AAAA-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_161ccc32-c028-4cd4-80b8-c79d29fb5e04.jpg?v=1782939893","url":"https:\/\/nationalhvacparts.com\/products\/carrier-hb1ajx024000aaaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}