{"product_id":"carrier-c4850c48ay02761-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V-24V for C4850C48AY02761","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C48AY02761\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C48AY02761\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage required by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dark — the thermostat loses power, the system won't respond to any call for heating or cooling, and in many cases the unit appears completely dead despite having line voltage present.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Factory-matched thermal protection and core lamination for long service life\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and tested to Carrier's exact VA rating and insulation class. Undersized or off-spec generic transformers can overheat under contactor coil inrush loads, causing nuisance tripping or premature failure and potentially damaging downstream control boards.\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 servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching wiring). Photograph or label all wire connections before removal. Reinstallation is straightforward — two primary leads and two secondary leads.\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 Engineered specifically for the \u003cstrong\u003eCarrier C4850C48AY02761\u003c\/strong\u003e packaged unit. Cross-reference OEM part number HT01BD236 against your unit's wiring diagram and data plate to confirm 120V primary and 24V\/40VA secondary ratings before ordering. Our parts specialists are available to verify fitment — order with confidence.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909884563827,"sku":"CARRIE-C4850C48AY02761-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909884596595,"sku":"CARRIE-C4850C48AY02761-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_90265c32-5c3f-4f8e-9f4d-4b7fd5fccac0.jpg?v=1782939261","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48ay02761-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}