{"product_id":"carrier-upflow250fau14b-transformer-h3hvc4","title":"OEM Carrier Furnace Transformer 40VA 120V–24V for UPFLOW250FAU14B","description":"\u003ch1\u003eOEM Carrier Furnace Transformer 40VA 120V to 24V — HT01CN001 for Model UPFLOW250FAU14B\u003c\/h1\u003e\u003cp\u003eThe Carrier HT01CN001 is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier UPFLOW250FAU14B\u003c\/strong\u003e upflow gas furnace. This transformer steps down 120V line voltage to a safe 24V (with 12V secondary tap) to power the furnace's entire low-voltage control circuit — including the thermostat, ignition board, gas valve, and all safety switches. When this transformer fails, the entire control system goes dark: the thermostat loses power, the furnace refuses to start, or you may notice a burning smell or audible buzzing at the transformer itself.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 120V primary | 24V \/ 12V secondary | 40VA rated | Factory-matched OEM tolerances | Part #: HT01CN001 | Replaces legacy part numbers HT01BJ115, 19EA41612, 19EA42612\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine Carrier factory part — not a generic substitute. OEM transformers are wound and insulated to exact VA and thermal ratings for the UPFLOW250FAU14B. Undersized or off-spec generic transformers can overload immediately if control wiring has even minor resistance issues.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always shut off the furnace disconnect and verify zero voltage before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all 24V wiring terminals before disconnecting. The transformer mounts to the blower compartment panel with two screws; primary and secondary leads connect to quick-connect or screw terminals.\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 as a direct OEM replacement for Carrier model \u003cstrong\u003eUPFLOW250FAU14B\u003c\/strong\u003e. Verify your existing transformer's primary voltage (120V), secondary voltage (24V\/12V), and VA rating (40VA) on the unit's data plate or existing transformer label before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640220373363,"sku":"CARRIE-UPFLOW250FAU14B-TRANSFORMER-HT01CN001","price":353.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640220406131,"sku":"CARRIE-UPFLOW250FAU14B-TRANSFORMER-HT01CN001-GEN","price":311.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01CN001_daebe634-cd24-4f0a-b517-d8bfdb1db4fc.jpg?v=1775031865","url":"https:\/\/nationalhvacparts.com\/products\/carrier-upflow250fau14b-transformer-h3hvc4","provider":"National HVAC Parts","version":"1.0","type":"link"}