{"product_id":"carrier-gb1aav042091acja-transformer-h2usbz","title":"OEM Carrier Transformer 40VA 120V-24V for GB1AAV042091ACJA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model GB1AAV042091ACJA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BC116\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier GB1AAV042091ACJA\u003c\/strong\u003e gas furnace. The transformer steps down line voltage from 120V to 24V AC to power the entire low-voltage control circuit — including the thermostat, gas valve, control board, and safety switches. When the transformer fails, nothing in the system responds: the thermostat goes blank, the furnace won't attempt ignition, and you may find a blown fuse on the control board. A failed transformer is often mistaken for a bad control board, making this an important first diagnostic step.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BC116 | Factory-matched output for full low-voltage circuit protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BC116 transformer meets Carrier's exact VA rating and insulation class. Undersized generic transformers can overheat under peak load — especially when multiple zone valves or accessories draw current simultaneously — leading to premature failure and potential control board damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify with a non-contact tester before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections before disconnecting. Confirm fuse condition on control board before replacing transformer.\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 for the Carrier \u003cstrong\u003eGB1AAV042091ACJA\u003c\/strong\u003e gas furnace. Always verify the OEM part number HT01BC116 on your existing transformer's label and cross-reference your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — contact us today and get it shipped fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909424271731,"sku":"CARRIE-GB1AAV042091ACJA-TRANSFORMER-HT01BC116","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909424304499,"sku":"CARRIE-GB1AAV042091ACJA-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_369db6d8-fdd7-47ae-88b1-25d9db3337ae.jpg?v=1782939805","url":"https:\/\/nationalhvacparts.com\/products\/carrier-gb1aav042091acja-transformer-h2usbz","provider":"National HVAC Parts","version":"1.0","type":"link"}