{"product_id":"carrier-gb1aav036065agja-transformer-h3hvc4","title":"OEM Carrier 40VA Transformer 120V–24V for GB1AAV036065AGJA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model GB1AAV036065AGJA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part# \u003cstrong\u003eHT01CN001\u003c\/strong\u003e) is the factory-specified control transformer for the \u003cstrong\u003eCarrier GB1AAV036065AGJA\u003c\/strong\u003e gas furnace. The transformer steps down 120V line voltage to 24V to power the control circuit, thermostat, and all low-voltage components. When this part fails, the entire system becomes unresponsive — the thermostat goes blank, the furnace won't fire, and no error codes are produced because the control board itself has lost power. If your system is completely dead with no response from the thermostat, a failed transformer is the first thing to check.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01CN001 | Factory-matched output for reliable control circuit operation\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 GB1AAV036065AGJA control board. Generic units may undervolt the circuit under load, causing intermittent lockouts, nuisance trips, or premature control board failure.\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, needle-nose pliers, multimeter (to confirm 0V before touching wiring). Photograph all low-voltage wiring connections before disconnecting. Transformer mounts to the blower compartment panel and connects to the main harness in 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 Engineered specifically for the Carrier \u003cstrong\u003eGB1AAV036065AGJA\u003c\/strong\u003e gas furnace. Verify your unit's data plate shows 120V\/24V control circuit and cross-reference OEM part number HT01CN001 before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — no guesswork, no returns.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909427188083,"sku":"CARRIE-GB1AAV036065AGJA-TRANSFORMER-HT01CN001","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909427220851,"sku":"CARRIE-GB1AAV036065AGJA-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_2f4b1726-c7b7-4268-94cd-222662ac79be.jpg?v=1782899682","url":"https:\/\/nationalhvacparts.com\/products\/carrier-gb1aav036065agja-transformer-h3hvc4","provider":"National HVAC Parts","version":"1.0","type":"link"}