{"product_id":"carrier-c48a503551-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C48A503551","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C48A503551\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C48A503551\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, contactor coil, and control board. When it fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to calls for heating or cooling, and no safety or operating sequence can begin. It is one of the most overlooked yet critical components in any HVAC system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA capacity | 120V primary \/ 24V secondary | Class 2 transformer | OEM part number HT01BD236 | Factory-matched for Carrier C48A503551 packaged units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact Carrier specifications, ensuring stable 24V output under full control circuit load. Generic alternatives often run undervoltage during peak demand, causing erratic contactor chatter, nuisance lockouts, and premature board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire stripper, multimeter. Label and photograph existing wiring before disconnecting. Typical replacement time is 20–30 minutes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our NationalHVACParts.com warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as a direct OEM replacement for \u003cstrong\u003eCarrier C48A503551\u003c\/strong\u003e packaged units. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or wiring diagram before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — order with confidence and get back up and running fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909732749683,"sku":"CARRIE-C48A503551-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909732782451,"sku":"CARRIE-C48A503551-TRANSFORMER-HT01BD236-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-HT01BD236_e190abe8-0817-4f78-8ff3-f61eb27b04ce.jpg?v=1782940204","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a503551-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}