{"product_id":"carrier-upflow125fauhac14b-transformer-h3hvc4","title":"OEM Carrier Furnace Transformer 40VA 120V–24V for UPFLOW125FAUHAC14B","description":"\u003ch1\u003eOEM Carrier Furnace Transformer 40VA 120V to 24V — HT01CN001 for Model UPFLOW125FAUHAC14B\u003c\/h1\u003e\u003cp\u003eThe Carrier HT01CN001 is the factory-specified control circuit transformer for the \u003cstrong\u003eUPFLOW125FAUHAC14B\u003c\/strong\u003e upflow gas furnace. Its job is to step line voltage down from 120V to a safe 24V DC that powers the thermostat, control board, gas valve relay, and every other low-voltage component in the system. When this transformer fails — typically from an electrical surge, a short in the control wiring, or years of normal wear — the entire 24V control circuit goes dead: the thermostat goes blank, the furnace refuses to respond to any command, and you may hear a faint buzz or hum from the transformer housing itself.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 120V primary | 12V \/ 24V secondary | 40VA rated | OEM part number HT01CN001 | Replaces legacy part numbers HT01BJ115, 19EA41612, 19EA42612\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier Factory Authorized Part — not an aftermarket substitute. OEM transformers are wound and potted to exact VA and impedance tolerances, ensuring stable 24V output under full control-circuit load. Generic units often underperform at VA limits, leading to nuisance lockouts and premature control board damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Shut off power at the disconnect AND the breaker before beginning. Tools needed: multimeter (verify zero voltage before touching terminals), flat-head and Phillips screwdrivers, needle-nose pliers, wire nuts or push-in connectors. Photograph all low-voltage wiring connections before disconnecting. Check control wiring for shorts before powering up the new transformer — an unresolved short will blow the new unit immediately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Factory-matched for Carrier model \u003cstrong\u003eUPFLOW125FAUHAC14B\u003c\/strong\u003e upflow gas furnace. Verify primary voltage (120V) and VA rating (40VA) on your unit's data plate before ordering. If your furnace uses a 208V or 240V primary, a different transformer part number is required — contact our team to confirm fitment before placing your order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640231252339,"sku":"CARRIE-UPFLOW125FAUHAC14B-TRANSFORMER-HT01CN001","price":353.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640231285107,"sku":"CARRIE-UPFLOW125FAUHAC14B-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_7e49c031-7c39-4511-ae72-3b9d2b1db347.jpg?v=1775031863","url":"https:\/\/nationalhvacparts.com\/products\/carrier-upflow125fauhac14b-transformer-h3hvc4","provider":"National HVAC Parts","version":"1.0","type":"link"}