{"product_id":"carrier-c4850c50aj03651-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50AJ03651 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model C4850C50AJ03651\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50AJ03651\u003c\/strong\u003e packaged unit. The transformer converts 120V line voltage down to the 24V signal required to power the entire control circuit — including the thermostat, contactor coil, gas valve, and control board. When this part fails, absolutely nothing in the system responds: the thermostat goes blank, the unit won't call for heating or cooling, and no components energize. A failed transformer is often misdiagnosed as a control board failure, making this an essential first diagnostic check.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input 120V AC | Output 24V AC | 40VA rated | OEM part number HT01BD236 | Factory-matched to Carrier C4850C50AJ03651 control circuit requirements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact factory VA rating and voltage tolerances. Undersized or off-tolerance generic transformers can overheat, trip internal fuses, or damage downstream control boards — making OEM the only reliable choice for this critical component.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before beginning. Tools needed: multimeter, flathead and Phillips screwdrivers, wire nuts or spade connectors. Test input and output voltage with a multimeter after installation to confirm proper operation before reassembling the unit.\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 Designed as a direct OEM replacement for the \u003cstrong\u003eCarrier C4850C50AJ03651\u003c\/strong\u003e packaged unit. Always verify your existing transformer's input\/output voltage and VA rating against your unit's data plate before ordering. If you're unsure of fitment, our parts specialists are available to confirm compatibility before you purchase — same-day shipping on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909840654707,"sku":"CARRIE-C4850C50AJ03651-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909840687475,"sku":"CARRIE-C4850C50AJ03651-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_b325834a-469c-4733-adaf-259694d217e2.jpg?v=1782938859","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50aj03651-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}