{"product_id":"carrier-c4850c50aj03551-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V-24V for C4850C50AJ03551","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C50AJ03551\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-specified control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50AJ03551\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system refuses any call for heating or cooling, and no fault codes are generated because the board itself has no power. Replacing this part is often the first diagnostic step when a unit appears completely unresponsive.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120VAC | Secondary: 24VAC | OEM part number HT01BD236 | Factory-matched impedance and insulation class for Carrier packaged equipment\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 factory control board. Undersized or off-tolerance aftermarket units can overheat under load, trip thermal protection, or deliver unstable 24V that causes nuisance faults and board damage over time.\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. Confirm 0V at both primary terminals before disconnecting wires. Label or photograph all low-voltage wiring before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. 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 Designed as a direct OEM replacement for the Carrier \u003cstrong\u003eC4850C50AJ03551\u003c\/strong\u003e packaged unit. Verify primary voltage (120V) and VA rating on your unit's wiring diagram or data plate before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork required. Order today and receive same-day shipping on all in-stock parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909841506675,"sku":"CARRIE-C4850C50AJ03551-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909841539443,"sku":"CARRIE-C4850C50AJ03551-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_9bd85c18-6c74-4bc0-a438-6311ff5dd763.jpg?v=1782939293","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50aj03551-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}