{"product_id":"carrier-hb1cjx024000aaaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V-24V for HB1CJX024000AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model HB1CJX024000AAAA\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 HB1CJX024000AAAA\u003c\/strong\u003e unit. The transformer steps down line voltage from 120V to the 24V AC signal that powers your thermostat, control board, and all low-voltage safety circuits. When the transformer fails, absolutely nothing works — the thermostat goes dark, the system won't respond to any call for heating or cooling, and you may detect a burning smell or a tripped internal fuse. It is one of the most overlooked yet critical components in any HVAC system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA capacity | Primary voltage: 120V AC | Secondary voltage: 24V AC | Factory OEM part number HT01AW229 | Designed to factory tolerance for reliable low-voltage output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers deliver a stable, clean 24V signal critical for sensitive control boards and smart thermostats. Generic units frequently output slightly off-voltage readings that can cause erratic board behavior, nuisance lockouts, or premature component failure downstream.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the breaker and verify with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminals. Label all wires before disconnecting. Confirm the old transformer is the fault by checking for 120V input but no 24V output.\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 stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as a direct OEM replacement for the Carrier \u003cstrong\u003eHB1CJX024000AAAA\u003c\/strong\u003e. Always verify your existing transformer's VA rating and primary\/secondary voltages on the data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility before you buy — same-day shipping means you're never without heat or cooling for long.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909346251123,"sku":"CARRIE-HB1CJX024000AAAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909346283891,"sku":"CARRIE-HB1CJX024000AAAA-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_ffbe851f-0867-4700-9f4c-ead8ddd197d2.jpg?v=1782939908","url":"https:\/\/nationalhvacparts.com\/products\/carrier-hb1cjx024000aaaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}