{"product_id":"carrier-c4850c50ak04051-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50AK04051 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C4850C50AK04051\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eC4850C50AK04051\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dark — your thermostat loses communication with the unit, and nothing responds to a call for heating or cooling. A blown transformer is often misdiagnosed as a failed control board, making this a critical first diagnostic step.\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 for Carrier C4850C50AK04051 packaged unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact factory VA and voltage tolerances. Generic units frequently undervolt the control circuit under load, causing intermittent lockouts, nuisance trips, and premature contactor coil failure.\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: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Verify 24V output with a multimeter before reassembly. Always confirm no secondary short exists before installing the new transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Leaves our warehouse the same business day when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Directly replaces transformer HT01BD236 in Carrier model \u003cstrong\u003eC4850C50AK04051\u003c\/strong\u003e packaged units. Confirm 120V primary and 40VA rating on your unit's data plate before ordering. Our parts specialists are available to verify fitment — contact us before you buy if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909828563315,"sku":"CARRIE-C4850C50AK04051-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909828596083,"sku":"CARRIE-C4850C50AK04051-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_8689b797-939a-41fc-9ca2-267851ad4c72.jpg?v=1782938878","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50ak04051-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}