{"product_id":"carrier-gb1aav048135agja-transformer-h3hvc4","title":"OEM Carrier 40VA Transformer 120V-24V for GB1AAV048135AGJA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01CN001 for Model GB1AAV048135AGJA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01CN001\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier GB1AAV048135AGJA\u003c\/strong\u003e gas furnace. The transformer is the backbone of your furnace's low-voltage control circuit, stepping down 120V line voltage to 24VAC to power the thermostat, control board, gas valve, and all safety circuits. When this component fails, nothing in the system responds — the thermostat goes blank, the furnace won't call for heat, and no status codes appear on the control board. A failed transformer is often misdiagnosed as a bad control board, so always test the secondary output (should read 24–28VAC) before replacing larger components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120VAC | Secondary: 24VAC | OEM part number HT01CN001 | Factory-matched for Carrier GB1AAV048135AGJA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by the Carrier control board. Undersized or out-of-tolerance generic units can cause nuisance tripping of the 3A fuse, erratic board behavior, or premature failure of the gas valve coil.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdriver, multimeter, wire nuts or spade connectors. Label all wiring connections before removal. Verify secondary output with a multimeter after installation before restoring full power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eGB1AAV048135AGJA\u003c\/strong\u003e gas furnace. Always confirm the 120V primary \/ 24V secondary \/ 40VA specification on your unit's data plate or existing transformer label before ordering. Our fitment team is available to verify compatibility before you purchase — ships today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909414900083,"sku":"CARRIE-GB1AAV048135AGJA-TRANSFORMER-HT01CN001","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909414932851,"sku":"CARRIE-GB1AAV048135AGJA-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_489ea22e-4ffa-4035-940b-b33b6ec9f241.jpg?v=1782899589","url":"https:\/\/nationalhvacparts.com\/products\/carrier-gb1aav048135agja-transformer-h3hvc4","provider":"National HVAC Parts","version":"1.0","type":"link"}