{"product_id":"carrier-c48a203552-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C48A203552 — Ships Today","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C48A203552\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier C48A203552\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage required to power the thermostat, control board, contactor coil, and all low-voltage control circuits. When this transformer fails, absolutely nothing in the control system responds — the thermostat goes blank, the system won't call for heating or cooling, and no fault codes appear because the board itself has no power.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01BD236 | Factory-matched to Carrier C48A203552 electrical specifications\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 the factory control board. Undersized or off-tolerance generic transformers can overheat, trip their internal fuse, or cause erratic low-voltage behavior that mimics board or thermostat failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: multimeter (verify 0V before touching wiring), 1\/4\" and 5\/16\" nut drivers, wire stripper. Always verify primary and secondary voltages after installation before restoring control circuit connections.\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 stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for Carrier model \u003cstrong\u003eC48A203552\u003c\/strong\u003e packaged units. Confirm your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. If you're unsure whether this is the right part, our HVAC parts specialists verify fitment before you buy — no guesswork required. Order now and get same-day shipping on in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909759848819,"sku":"CARRIE-C48A203552-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909759881587,"sku":"CARRIE-C48A203552-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_d2bae49e-b195-426a-9662-e5c2f6af5c61.jpg?v=1782899278","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a203552-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}