{"product_id":"carrier-c48a303561-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C48A303561 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA for Model C48A303561\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eC48A303561\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V control circuit voltage required to power the thermostat, contactor coil, control board, and all low-voltage safety controls. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any calls for heating or cooling, and no contactors or relays will energize.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory-matched OEM winding | Designed for Carrier packaged unit control circuit demands\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD236 transformer is wound to exact factory VA and voltage tolerances. Generic transformers often run undersized on VA rating, causing overheating and premature burnout — especially in systems with multiple 24V accessories such as zone boards, humidistats, or communicating thermostats.\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 to confirm 24V output after installation. Photograph all low-voltage wiring connections before disconnecting. Always verify the secondary fuse or circuit protector after replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits Carrier model \u003cstrong\u003eC48A303561\u003c\/strong\u003e packaged unit. Verify transformer VA rating and primary\/secondary voltages on your unit's wiring diagram or data plate before ordering. If you are unsure of fitment, our technical team is available to confirm the correct part for your specific unit before you order — same-day shipping on all in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909751099763,"sku":"CARRIE-C48A303561-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909751132531,"sku":"CARRIE-C48A303561-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_cc15f7b9-f7fa-4ec1-8f67-bd5dd1a5fd5a.jpg?v=1782899336","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a303561-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}