{"product_id":"carrier-c4850c50aj03661-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Transformer for C4850C50AJ03661 — Ships Today","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer 120V–24V for Model C4850C50AJ03661\u003c\/h1\u003e\u003cp\u003eThis OEM replacement control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified unit for the \u003cstrong\u003eCarrier C4850C50AJ03661\u003c\/strong\u003e packaged system. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dead — your thermostat goes blank, the system stops responding to calls for heating or cooling, and no safety controls or relays will operate. It is often the first component to check when a unit appears completely non-functional despite confirmed line voltage at the disconnect.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120VAC | Secondary: 24VAC | OEM part number HT01BD236 | Factory-matched for Carrier C4850C50AJ03661 packaged systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact VA and voltage tolerances specified by Carrier engineering. Undersized or off-tolerance generic transformers can sag under load, causing nuisance lockouts, board resets, and premature contactor coil failure throughout the system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect and lock out power before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Confirm primary and secondary wiring labels before disconnecting. Always verify 24VAC output at secondary terminals after installation before restoring full system power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In-stock units ship same business day from our warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the \u003cstrong\u003eCarrier C4850C50AJ03661\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. If you are unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you purchase. Order today and get same-day shipping on this in-stock OEM Carrier control transformer.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909840556403,"sku":"CARRIE-C4850C50AJ03661-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909840589171,"sku":"CARRIE-C4850C50AJ03661-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_e8c5c82d-48cd-4cfc-ac3e-e3a9832ee6b3.jpg?v=1782899401","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50aj03661-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}