{"product_id":"carrier-c48a405052-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C48A405052 — Ships Today","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model C48A405052\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C48A405052\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 120V to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, absolutely nothing in the control system responds: the thermostat goes blank, the system won't call for heating or cooling, and diagnostic LEDs on the control board may go dark entirely.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD236 | Factory-matched output tolerance for stable control voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to Carrier's exact VA and voltage specifications. Undersized or off-tolerance generic transformers can sag under load, causing intermittent control lockouts, nuisance tripping, and premature contactor coil failure.\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, wire stripper, multimeter, wire nuts. Always verify 0V at the primary terminals with a multimeter before handling. Photograph existing wiring connections before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. 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 for the Carrier \u003cstrong\u003eC48A405052\u003c\/strong\u003e packaged unit. Before ordering, verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or existing component label. Compatible with the standard 40VA 24V control circuit configuration. Our fitment team is available to confirm compatibility before you order — reach out with your full model and serial number.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909738942835,"sku":"CARRIE-C48A405052-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909738975603,"sku":"CARRIE-C48A405052-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_d16fa12f-c347-4d46-a282-d0a7b235d130.jpg?v=1782939231","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a405052-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}