{"product_id":"carrier-gb1aav024045adja-transformer-h2usbz","title":"OEM Carrier Transformer 40VA 120V\/24V for GB1AAV024045ADJA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model GB1AAV024045ADJA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part# \u003cstrong\u003eHT01BC116\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier GB1AAV024045ADJA\u003c\/strong\u003e fan coil unit. The transformer steps down 120V line voltage to 24V AC, which powers the entire low-voltage control circuit — including the thermostat, control board, and zone valves. When this transformer fails, the thermostat goes completely dark, the system stops responding to any call for heating or cooling, and in some cases a tripped secondary fuse is the first clue. No other component can bring the system back online until the transformer is replaced.\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 voltage and VA capacity for Carrier GB1AAV024045ADJA\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 control circuit. Undersized or off-tolerance generic units can overheat, trip thermal cutoffs repeatedly, or deliver insufficient current to fire contactors and gas valves reliably.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, needle-nose pliers, multimeter to confirm 24V output after installation. Label all low-voltage wiring before disconnecting from the old transformer.\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 cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003eGB1AAV024045ADJA\u003c\/strong\u003e fan coil unit. Confirm your unit's data plate lists 120V primary input and 24V\/40VA secondary before ordering. If you're unsure of fitment, our parts team is available to verify compatibility before you buy. \u003cstrong\u003eOrder today and receive same-day shipping — get your system back online fast.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909436756339,"sku":"CARRIE-GB1AAV024045ADJA-TRANSFORMER-HT01BC116","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909436789107,"sku":"CARRIE-GB1AAV024045ADJA-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_1c84226b-d903-40b3-ba29-aa453a636842.jpg?v=1782941341","url":"https:\/\/nationalhvacparts.com\/products\/carrier-gb1aav024045adja-transformer-h2usbz","provider":"National HVAC Parts","version":"1.0","type":"link"}