{"product_id":"carrier-c4850c48ay02751-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V-24V for C4850C48AY02751","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C48AY02751\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C48AY02751\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, and all low-voltage control circuit components. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, no calls for heat or cool are processed, and the system will not respond to any inputs. A failed transformer is often mistaken for a bad thermostat or control board, making proper diagnosis essential before replacement.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Class 2 transformer | Factory-matched to OEM Carrier specifications | OEM Part Number: HT01BD236\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by the Carrier control board. Undersized or off-tolerance generic units can overheat, trip internal protection, or cause erratic low-voltage behavior and nuisance lockouts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (verify 0V before touching wires), wire stripper. Label and photograph all wiring connections before disconnecting the old unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In-stock and ships same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as a direct OEM replacement for \u003cstrong\u003eCarrier C4850C48AY02751\u003c\/strong\u003e packaged units. Always verify your unit's data plate voltage requirements and VA rating before ordering to ensure proper fitment. Not sure if this is the right part? Our HVAC parts specialists verify fitment before every order — contact us before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909884629363,"sku":"CARRIE-C4850C48AY02751-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909884662131,"sku":"CARRIE-C4850C48AY02751-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_7de8fa54-21f3-4d5d-932b-6f9a0a55d2f9.jpg?v=1782939259","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48ay02751-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}