{"product_id":"carrier-upflow125uaac14b-transformer-h3hvc4","title":"OEM Carrier Transformer 120V–24V 40VA for UPFLOW125UAAC14B","description":"\u003ch1\u003eOEM Carrier Furnace Transformer 120V to 24V 40VA — HT01CN001 for Model UPFLOW125UAAC14B\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part# HT01CN001) for the \u003cstrong\u003eCarrier UPFLOW125UAAC14B\u003c\/strong\u003e upflow gas furnace. The transformer steps down 120V line voltage to a 24V\/12V secondary signal that powers the entire low-voltage control circuit — including the thermostat, control board, gas valve, and safety switches. When this transformer fails, the system loses all control-circuit power: the thermostat goes blank, the furnace won't respond to any call for heat or cooling, and in many cases nothing happens at all when the system is commanded to run. A failed transformer is often misdiagnosed as a thermostat or control board issue, making correct identification of this part critical before replacing more expensive components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 120V primary | 24V \/ 12V secondary | 40VA rating | Factory-matched OEM tolerances | Replaces legacy part numbers HT01BJ115, 19EA41612, 19EA42612\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01CN001 is wound to exact Carrier factory specifications, ensuring precise 24V output under full control-circuit load. Generic transformers with loose VA tolerances can sag under load, causing erratic board behavior, nuisance lockouts, or premature secondary-component failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Confirm 0V at primary terminals before handling. Label all low-voltage wiring before disconnecting from the old transformer. Verify output reads ~24V AC after installation before restoring full system power.\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 Designed as the direct OEM drop-in replacement for the \u003cstrong\u003eCarrier UPFLOW125UAAC14B\u003c\/strong\u003e upflow gas furnace. Always verify your unit's data plate and existing transformer VA rating before ordering to ensure a correct fit. Have your model and serial number ready — our team is available to confirm fitment before you purchase. \u003cstrong\u003eOrder now and receive same-day shipping on in-stock units.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640230498675,"sku":"CARRIE-UPFLOW125UAAC14B-TRANSFORMER-HT01CN001","price":353.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640230531443,"sku":"CARRIE-UPFLOW125UAAC14B-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_a6ef51a0-50c0-40a6-8ec4-58265c74cd87.jpg?v=1775041111","url":"https:\/\/nationalhvacparts.com\/products\/carrier-upflow125uaac14b-transformer-h3hvc4","provider":"National HVAC Parts","version":"1.0","type":"link"}