{"product_id":"carrier-gb1aav042091adja-transformer-h2usbz","title":"OEM Carrier Transformer 40VA 120V-24V for GB1AAV042091ADJA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BC116 for Model GB1AAV042091ADJA\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer (part# \u003cstrong\u003eHT01BC116\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier GB1AAV042091ADJA\u003c\/strong\u003e gas furnace. The control transformer converts 120V line voltage to 24V AC, powering the thermostat, gas valve, control board, and all low-voltage control circuits throughout the system. When this component fails, the entire control circuit goes dead — the thermostat displays nothing, the furnace won't fire, and no components respond. It is often the first component to diagnose when a system is completely unresponsive despite having line power confirmed at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Class 2 transformer | OEM part number HT01BC116 | Factory-matched output tolerances for stable low-voltage operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BC116 is wound to Carrier's exact VA and voltage specifications, ensuring stable 24V output under full load. Undersized or off-tolerance generic transformers can cause erratic board behavior, nuisance lockouts, and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade connectors, multimeter. Label or photograph all wire connections before removal. Replacement typically takes 20–30 minutes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. 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\u003eGB1AAV042091ADJA\u003c\/strong\u003e gas furnace. Verify OEM part number HT01BC116 and transformer VA\/voltage ratings on your unit's data plate or existing transformer label before ordering. Not sure if this is the right part? Our HVAC parts specialists confirm fitment before you order — no guesswork, no returns.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909423976819,"sku":"CARRIE-GB1AAV042091ADJA-TRANSFORMER-HT01BC116","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909424009587,"sku":"CARRIE-GB1AAV042091ADJA-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_13b9f3fa-f3c5-4db7-822d-1bd51ae24b6a.jpg?v=1782939807","url":"https:\/\/nationalhvacparts.com\/products\/carrier-gb1aav042091adja-transformer-h2usbz","provider":"National HVAC Parts","version":"1.0","type":"link"}