{"product_id":"carrier-gb1aav042075aaja-transformer-h2usbz","title":"OEM Carrier 40VA Transformer 120V-24V for GB1AAV042075AAJA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer 120V–24V for Model GB1AAV042075AAJA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BC116\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier GB1AAV042075AAJA\u003c\/strong\u003e gas furnace. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, gas valve, and every other low-voltage control circuit in the unit. When it fails, the entire control system goes dark — the thermostat display goes blank, the furnace will not respond to any call for heat, and no status codes will display. A failed transformer is often the first suspect when absolutely nothing happens after a call for heat.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BC116 | Factory-matched windings and insulation class for continuous duty\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 Carrier GB1AAV042075AAJA. Undersized or off-tolerance aftermarket units can nuisance-trip the furnace's low-voltage circuit, cause intermittent lockouts, or fail prematurely under full load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph all wiring connections before removal. Confirm 24V output at secondary terminals after install before reassembling panels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before 3 PM ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered and factory-matched for Carrier model \u003cstrong\u003eGB1AAV042075AAJA\u003c\/strong\u003e gas furnaces. Verify your existing transformer's VA rating and primary\/secondary voltage on the unit data plate or old transformer label before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909424894323,"sku":"CARRIE-GB1AAV042075AAJA-TRANSFORMER-HT01BC116","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909424927091,"sku":"CARRIE-GB1AAV042075AAJA-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_c4816d51-8254-46b9-8825-268da5a045f6.jpg?v=1782899586","url":"https:\/\/nationalhvacparts.com\/products\/carrier-gb1aav042075aaja-transformer-h2usbz","provider":"National HVAC Parts","version":"1.0","type":"link"}