{"product_id":"carrier-gb1aav042091abja-transformer-h2usbz","title":"OEM Carrier Transformer 40VA 120V\/24V for GB1AAV042091ABJA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model GB1AAV042091ABJA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BC116\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier GB1AAV042091ABJA\u003c\/strong\u003e gas furnace. The transformer steps down 120V line voltage to the 24V signal voltage required by your thermostat, control board, gas valve, and all low-voltage control components. When the transformer fails, the entire low-voltage control circuit goes dead — the thermostat goes blank, nothing responds to a call for heat, and the system will not attempt ignition. A blown fuse on the secondary side is often the first warning sign before full transformer failure.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | Class 2 transformer | OEM part number HT01BC116 | Factory-matched construction for direct drop-in fit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This factory OEM transformer is wound to exact VA and voltage tolerances for the GB1AAV042091ABJA control circuit. Generic transformers frequently run under-rated VA, causing overheating, nuisance fuse failures, and premature control board damage — costing far more in downstream repairs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after installation. Label or photograph all wiring connections before removal. Secondary circuit fuse should be inspected and replaced if blown.\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 3PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eGB1AAV042091ABJA\u003c\/strong\u003e gas furnace. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or wiring diagram before ordering. If you're unsure, our HVAC parts specialists confirm fitment before you buy — no guesswork, no returns.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909424697715,"sku":"CARRIE-GB1AAV042091ABJA-TRANSFORMER-HT01BC116","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909424730483,"sku":"CARRIE-GB1AAV042091ABJA-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_132d1ac4-d4d1-4ac8-a381-e6b5d9fe752a.jpg?v=1782941371","url":"https:\/\/nationalhvacparts.com\/products\/carrier-gb1aav042091abja-transformer-h2usbz","provider":"National HVAC Parts","version":"1.0","type":"link"}