{"product_id":"carrier-gb1aav048111afja-transformer-h2usbz","title":"OEM Carrier Transformer 40VA 120\/24V for GB1AAV048111AFJA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model GB1AAV048111AFJA\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-replacement control transformer (part# \u003cstrong\u003eHT01BC116\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier GB1AAV048111AFJA\u003c\/strong\u003e packaged gas\/electric unit. The transformer steps down line voltage (120V) to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuits. When this component fails, the entire control circuit goes dead — the thermostat goes blank, relays stop responding, and the system won't heat or cool regardless of settings. A failed transformer is often mistaken for a bad thermostat or control board, making it one of the first components to test during a no-power diagnostic.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | Class 2 low-voltage output | Factory-matched impedance for Carrier GB1AAV048111AFJA control circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers (HT01BC116) are wound to exact VA and impedance tolerances required by the Carrier control board. Undersized or off-spec generic units can cause nuisance tripping, undervoltage faults, and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or quick-connects. Always verify 0V at primary terminals before handling. Swap wiring one lead at a time to avoid miswiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Order by 3 PM local time and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as a direct OEM replacement for the Carrier \u003cstrong\u003eGB1AAV048111AFJA\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the data plate or wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment — just reach out before you buy. \u003cstrong\u003eIn stock and ready to ship today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909416898931,"sku":"CARRIE-GB1AAV048111AFJA-TRANSFORMER-HT01BC116","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909416931699,"sku":"CARRIE-GB1AAV048111AFJA-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_47d33288-b815-4fc5-b066-3769e5642c00.jpg?v=1782938727","url":"https:\/\/nationalhvacparts.com\/products\/carrier-gb1aav048111afja-transformer-h2usbz","provider":"National HVAC Parts","version":"1.0","type":"link"}