{"product_id":"carrier-ga1aad048070abja-transformer-h2usbz","title":"OEM Carrier Transformer 40VA 120V–24V for GA1AAD048070ABJA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V–24V for Model GA1AAD048070ABJA\u003c\/h1\u003e\u003cp\u003eThis OEM control circuit transformer (part number \u003cstrong\u003eHT01BC116\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier GA1AAD048070ABJA\u003c\/strong\u003e packaged gas\/electric unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and every low-voltage component in the system. When the transformer fails, the entire control circuit goes dark — the thermostat goes blank, the system stops responding to any call for heating or cooling, and no components energize. It is one of the first parts to check when your system appears completely dead with no error codes.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | Class 2 transformer | OEM part number HT01BC116 | Factory-matched output for stable, consistent 24V delivery\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 GA1AAD048070ABJA control board. Undersized or off-tolerance generic units can cause erratic thermostat behavior, nuisance lockouts, and premature control board failure due to voltage sag under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Note wire colors and terminal labels before disconnecting the old unit. Confirm 24V output with a multimeter after installation before restoring full system power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eGA1AAD048070ABJA\u003c\/strong\u003e packaged unit. Always verify the transformer's VA rating and primary\/secondary voltages against your unit's wiring diagram and data plate before ordering. If you are unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you purchase. In stock and ready to ship today — get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909451436403,"sku":"CARRIE-GA1AAD048070ABJA-TRANSFORMER-HT01BC116","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909451469171,"sku":"CARRIE-GA1AAD048070ABJA-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_8c47d545-78aa-4aeb-ac81-c6435baecb47.jpg?v=1782941928","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ga1aad048070abja-transformer-h2usbz","provider":"National HVAC Parts","version":"1.0","type":"link"}