{"product_id":"carrier-c48a504052-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C48A504052","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C48A504052\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified step-down transformer for the \u003cstrong\u003eCarrier C48A504052\u003c\/strong\u003e packaged unit. It converts 120V line voltage to the 24V signal required to power the control board, thermostat circuit, and all low-voltage components. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any calls for heating or cooling, and no fault codes will display. A failed transformer is often misdiagnosed as a control board failure, making this an essential first diagnostic step.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | Hardwired leads | Factory-matched output tolerance for stable low-voltage control signal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM Carrier transformer (HT01BD236) is wound to exact factory VA and voltage specifications. Generic transformers may deliver unstable 24V output, causing erratic thermostat behavior, contactor chatter, or nuisance lockouts that are difficult to diagnose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire stripper, multimeter. Confirm 24V output at secondary leads 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 Engineered for the Carrier \u003cstrong\u003eC48A504052\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate or wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment before you purchase — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909730685299,"sku":"CARRIE-C48A504052-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909730718067,"sku":"CARRIE-C48A504052-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_d171d2d4-fe75-4905-8989-657dedc80cb8.jpg?v=1782940215","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a504052-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}