{"product_id":"carrier-u19x100u48a-transformer-h3hvc4","title":"OEM Carrier Transformer 40VA 120V–24V for U19X100U48A — HT01CN001","description":"\u003ch1\u003eOEM Carrier 40VA Transformer 120V to 24V for Model U19X100U48A — Part# HT01CN001\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement control transformer for the \u003cstrong\u003eCarrier U19X100U48A\u003c\/strong\u003e, part number \u003cstrong\u003eHT01CN001\u003c\/strong\u003e. The transformer steps down 120V line voltage to a safe 24V (12\/24V secondary) to power the low-voltage control circuit — including your thermostat, contactor coil, and control board logic. When this transformer fails, the entire control circuit goes dead: the thermostat displays nothing, the system refuses to respond to any command, and you may detect a burning smell or audible buzzing near the air handler or furnace cabinet.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary | 12V \/ 24V secondary | Direct OEM drop-in replacement for Carrier U19X100U48A | Replaces legacy part numbers HT01BJ115, 19EA41612, 19EA42612\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generic units risk nuisance tripping, control board damage, and shortened system life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (verify 0V before touching wiring), wire stripper, and needle-nose pliers. Photograph all wiring connections before removing the old transformer. Verify secondary voltage output with a multimeter after installation before restoring full power.\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 an exact OEM replacement for Carrier model \u003cstrong\u003eU19X100U48A\u003c\/strong\u003e. Always confirm the part number on your existing transformer's label and verify primary\/secondary voltage ratings on your unit's data plate before ordering. Need help confirming fitment? Our HVAC parts specialists are standing by to verify compatibility before you buy — same-day shipping guaranteed on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640248095091,"sku":"CARRIE-U19X100U48A-TRANSFORMER-HT01CN001","price":369.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640248127859,"sku":"CARRIE-U19X100U48A-TRANSFORMER-HT01CN001-GEN","price":325.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01CN001_4acf4e18-c74a-4e78-a570-0f5d24868eec.jpg?v=1775041434","url":"https:\/\/nationalhvacparts.com\/products\/carrier-u19x100u48a-transformer-h3hvc4","provider":"National HVAC Parts","version":"1.0","type":"link"}