{"product_id":"carrier-c48a404051-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Transformer for C48A404051 — Ships Today","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C48A404051\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-specified control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C48A404051\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this part fails, the entire control circuit goes dead: the thermostat loses power, the system won't respond to any call for heating or cooling, and nothing turns on despite the unit having full line voltage. A failed transformer is one of the most commonly overlooked causes of a completely unresponsive HVAC system.\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 output tolerance for stable low-voltage control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound and rated to Carrier's exact specifications. Generic replacements often use thinner windings and lower-grade cores that run hot, degrade faster under load, and can cause erratic control behavior or nuisance tripping of downstream fuses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Confirm 24V output across secondary terminals after install before reconnecting control wiring. Always check for a shorted control circuit that may have caused the original failure.\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 Designed for the Carrier \u003cstrong\u003eC48A404051\u003c\/strong\u003e packaged unit. Verify primary voltage (120V) and VA rating on your unit's data plate before ordering. If your unit runs a 208\/240V primary, do not use this transformer. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you order — reach out before purchasing.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909740188019,"sku":"CARRIE-C48A404051-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909740220787,"sku":"CARRIE-C48A404051-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_a3c5ad1c-be87-4a14-931b-43a0257f9261.jpg?v=1782899445","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a404051-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}