{"product_id":"carrier-c4850c48ay03561-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C4850C48AY03561","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer (HT01BD236) for Model C4850C48AY03561\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer for the \u003cstrong\u003eCarrier C4850C48AY03561\u003c\/strong\u003e packaged unit. The control transformer steps line voltage (120V) down to the 24V signal voltage that powers your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this transformer fails, the entire control circuit goes dead — your thermostat goes blank, the system stops responding to calls for heating or cooling, and no components will energize. If you're reading 0V at your 24V secondary terminals, this transformer is the first place to check.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e OEM Part Number HT01BD236 | 40VA rating | Primary: 120V | Secondary: 24V | Hardwired terminal connections | Factory-matched impedance and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers from Carrier use UL-listed cores wound to exact VA and voltage specifications. Undersized or off-tolerance generic transformers can overload under heavy relay switching, causing nuisance trips or premature failure of downstream control boards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Always verify 0V at primary terminals before handling. Label all low-voltage wiring prior to disconnecting the old unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as the direct OEM replacement for \u003cstrong\u003eCarrier model C4850C48AY03561\u003c\/strong\u003e packaged units. Confirm your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or wiring diagram before ordering. Our parts specialists are available to verify fitment — order with confidence and get back up and running fast. \u003cstrong\u003eIn stock — ships today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909882761587,"sku":"CARRIE-C4850C48AY03561-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909882794355,"sku":"CARRIE-C4850C48AY03561-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_5f5c6171-a8c4-40f7-a470-3cde62dcc70f.jpg?v=1782940047","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48ay03561-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}