{"product_id":"carrier-gb1aav036045agja-transformer-h3hvc4","title":"OEM Carrier Transformer 40VA 120\/24V for GB1AAV036045AGJA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model GB1AAV036045AGJA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement control transformer (part# \u003cstrong\u003eHT01CN001\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier GB1AAV036045AGJA\u003c\/strong\u003e gas furnace. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, control board, gas valve, and contactor coil. When it fails, the entire control circuit goes dark: the thermostat display goes blank, the system refuses to respond to any call for heat or cooling, and you may detect a burning or overheated odor near the air handler cabinet.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory OEM part number HT01CN001 | Matches original mounting footprint and terminal configuration for direct drop-in replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers from Carrier are wound to exact VA tolerances, ensuring the 24V control circuit maintains stable voltage under full load. Generic alternatives frequently run undervoltage, causing nuisance lockouts, contactor chatter, and 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 confirm zero voltage with a multimeter before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all low-voltage wires before disconnecting. Verify transformer output reads 24–28V AC after reinstallation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In stock and ships the same business day from our HVAC-dedicated warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eGB1AAV036045AGJA\u003c\/strong\u003e gas furnace. Verify your existing transformer's VA rating and primary\/secondary voltage on the data plate or old transformer label before ordering — mismatched VA ratings can damage the control board. Need fitment confirmation? Our parts team is available to verify compatibility before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909429055859,"sku":"CARRIE-GB1AAV036045AGJA-TRANSFORMER-HT01CN001","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909429088627,"sku":"CARRIE-GB1AAV036045AGJA-TRANSFORMER-HT01CN001-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-HT01CN001_f1de7ba7-0bbe-4ae1-b0ee-2f6d449ebefe.jpg?v=1782938714","url":"https:\/\/nationalhvacparts.com\/products\/carrier-gb1aav036045agja-transformer-h3hvc4","provider":"National HVAC Parts","version":"1.0","type":"link"}