{"product_id":"carrier-gb1aav042091aeja-transformer-h2usbz","title":"OEM Carrier Transformer 40VA 120V\/24V for GB1AAV042091AEJA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model GB1AAV042091AEJA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part# \u003cstrong\u003eHT01BC116\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eGB1AAV042091AEJA\u003c\/strong\u003e gas furnace. The transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and control board. When it fails, the system goes completely silent: no thermostat response, no inducer startup, and no error codes — because there's no control voltage to drive anything.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | Factory OEM part number HT01BC116 | Built-in secondary fuse protection on select configurations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances for the GB1AAV042091AEJA control board's current draw. Undersized or off-spec generic units can overheat, blow secondary fuses repeatedly, or deliver unstable voltage that causes nuisance lockouts and premature board failure.\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 screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections before removing the old transformer. Verify 24V output at secondary terminals after installation before closing the panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eGB1AAV042091AEJA\u003c\/strong\u003e gas furnace. Always verify your existing transformer's VA rating and primary\/secondary voltages on the data plate before ordering — mismatched VA ratings can damage connected components. Our fitment team is available to confirm compatibility before you buy. Order today and get back to heat fast with same-day shipping.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909423255923,"sku":"CARRIE-GB1AAV042091AEJA-TRANSFORMER-HT01BC116","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909423288691,"sku":"CARRIE-GB1AAV042091AEJA-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_b23a0280-d9a8-43e7-8b3f-441198766da3.jpg?v=1782941374","url":"https:\/\/nationalhvacparts.com\/products\/carrier-gb1aav042091aeja-transformer-h2usbz","provider":"National HVAC Parts","version":"1.0","type":"link"}