{"product_id":"carrier-c4850c48ay03661-transformer-h302a1","title":"OEM Carrier 40VA Transformer 24V Control Circuit for C4850C48AY03661","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C48AY03661\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C48AY03661\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, contactor coil, and control board. When this component fails, the entire low-voltage control circuit goes dead — the thermostat goes blank, the system stops responding to calls for cooling or heating, and nothing operates. Replacing a failed transformer is one of the most cost-effective repairs in HVAC service.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Factory-matched to Carrier C4850C48AY03661 wiring harness and mounting bracket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine OEM Carrier transformer manufactured to exact VA and voltage tolerances. Generic transformers frequently underperform at rated load, causing nuisance tripping of the secondary fuse and premature control board failure — especially in packaged units with higher 24V circuit demands.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching terminals). Photograph all wiring connections before removal. Secondary fuse should also be inspected and replaced if blown.\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 climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the \u003cstrong\u003eCarrier C4850C48AY03661\u003c\/strong\u003e packaged unit. Always verify your existing transformer's VA rating and primary\/secondary voltages against your unit's data plate before ordering. If your secondary fuse blew, diagnose the root cause (shorted wiring or failed component) before installing to protect the new transformer. Our HVAC parts specialists are available to confirm fitment — just reach out before you order. \u003cstrong\u003eIn stock — order by 3PM and ships today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909881778547,"sku":"CARRIE-C4850C48AY03661-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909881811315,"sku":"CARRIE-C4850C48AY03661-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_19aa3d09-d39a-474b-8765-cc7aaafd459e.jpg?v=1782899805","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48ay03661-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}