{"product_id":"carrier-gb1aav042091agja-transformer-h3hvc4","title":"OEM Carrier Transformer 40VA 120\/24V for GB1AAV042091AGJA — HT01CN001","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01CN001 for Model GB1AAV042091AGJA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01CN001\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier GB1AAV042091AGJA\u003c\/strong\u003e gas furnace. The transformer steps down line voltage from 120V to the 24V AC signal that powers your thermostat, control board, gas valve, and all low-voltage control components. When it fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any call for heat or cooling, and no fault codes are generated because the board itself has no power.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | Class 2 output | UL-recognized construction | Direct OEM factory replacement for part number HT01CN001\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and insulated to exact factory specifications, ensuring stable 24V output under full load. Generic units can exhibit voltage sag under peak demand, causing intermittent lockouts, nuisance tripping of safeties, 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 before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wires before disconnecting. Measure secondary output (should read 24–28V AC) after installation to confirm proper operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003eGB1AAV042091AGJA\u003c\/strong\u003e gas furnace. Confirm your existing transformer's VA rating and primary\/secondary voltages on the data plate before ordering. If you're unsure of fitment, our HVAC parts specialists verify compatibility before every order — no guesswork required. Order by 3PM local time and your part ships today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909422141811,"sku":"CARRIE-GB1AAV042091AGJA-TRANSFORMER-HT01CN001","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909422174579,"sku":"CARRIE-GB1AAV042091AGJA-TRANSFORMER-HT01CN001-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-HT01CN001_677829b3-167b-4468-b157-4f0bc7a6f15e.jpg?v=1782938721","url":"https:\/\/nationalhvacparts.com\/products\/carrier-gb1aav042091agja-transformer-h3hvc4","provider":"National HVAC Parts","version":"1.0","type":"link"}