{"product_id":"carrier-c4850c50ay03551-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50AY03551 — Ships Today","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C4850C50AY03551\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50AY03551\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When it fails, the entire control circuit goes dead: the thermostat goes blank, the system won't respond to any call for heating or cooling, and there are no error codes 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 output voltage and VA capacity for reliable control circuit operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact factory VA tolerances, preventing overload tripping and premature failure caused by undersized aftermarket windings common in generic alternatives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 24V output with a meter before reassembling the unit. Always label wires before disconnecting the old transformer.\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 This transformer is the specified OEM replacement for the Carrier \u003cstrong\u003eC4850C50AY03551\u003c\/strong\u003e packaged unit. If you are unsure whether this part fits your specific unit configuration, verify the part number on your existing transformer's label or contact our fitment team before ordering. Orders placed before 3PM EST ship same day.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909811523955,"sku":"CARRIE-C4850C50AY03551-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909811556723,"sku":"CARRIE-C4850C50AY03551-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_c642c95d-ae2f-49f2-b8dd-d05804b0098a.jpg?v=1782938955","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50ay03551-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}