{"product_id":"carrier-gb3aav048075aaja-transformer-h2usbz","title":"OEM Carrier Transformer 40VA 120V\/24V for GB3AAV048075AAJA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BC116 for Model GB3AAV048075AAJA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BC116\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier GB3AAV048075AAJA\u003c\/strong\u003e gas furnace. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, and all low-voltage control circuits. When this component fails, the entire control circuit loses power — the thermostat goes blank, the system becomes completely unresponsive, and no heating function can be initiated. A failed transformer is often misdiagnosed as a control board or thermostat failure, making it a critical first diagnostic check.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V | Secondary: 24V | OEM part number HT01BC116 | Factory-matched to Carrier GB3AAV048075AAJA wiring harness and mounting configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and impedance specifications, protecting sensitive downstream components like the control board. Generic transformers can run under-rated VA, causing voltage sag that triggers nuisance lockouts or damages the IFC board over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the breaker and disconnect switch before proceeding. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output before reassembly). Label all wiring before disconnecting from secondary terminals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for Carrier model \u003cstrong\u003eGB3AAV048075AAJA\u003c\/strong\u003e gas furnace. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility — reach out before you order if unsure. \u003cstrong\u003eIn stock and ships today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909394289011,"sku":"CARRIE-GB3AAV048075AAJA-TRANSFORMER-HT01BC116","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909394321779,"sku":"CARRIE-GB3AAV048075AAJA-TRANSFORMER-HT01BC116-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-HT01BC116_54066bab-b688-499a-a5f2-0a6a0c62b8b8.jpg?v=1782941432","url":"https:\/\/nationalhvacparts.com\/products\/carrier-gb3aav048075aaja-transformer-h2usbz","provider":"National HVAC Parts","version":"1.0","type":"link"}