{"product_id":"carrier-c48a903064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C48A903064 — HT01BD702","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA for Model C48A903064 — Part HT01BD702\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement control transformer (part# \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C48A903064\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage required by your thermostat, control board, contactor coil, and all low-voltage accessories. When this transformer fails, the entire control circuit goes dark — your thermostat will appear dead, the system won't respond to any calls for heating or cooling, and no safety or diagnostic functions will operate.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Class 2 control transformer | Factory-matched to Carrier C48A903064 wiring harness and board interface\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers from Carrier are wound to exact VA and voltage tolerance specifications. Undersized or off-tolerance generic transformers can overheat, trip internal breakers, or cause erratic low-voltage behavior that's difficult to diagnose and can damage downstream components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always disconnect power at the disconnect box and breaker before beginning work. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wires before removal. Verify 24V 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 against defects. Ships same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed and factory-specified for the \u003cstrong\u003eCarrier C48A903064\u003c\/strong\u003e packaged unit. Cross-reference OEM part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e against your unit's data plate and wiring diagram before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before every order — reach out and we'll confirm. \u003cstrong\u003eIn stock and ships today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909719576947,"sku":"CARRIE-C48A903064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909719609715,"sku":"CARRIE-C48A903064-TRANSFORMER-HT01BD702-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-HT01BD702_6b426aa3-2029-4032-93cc-050e016dcace.jpg?v=1782940308","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a903064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}