{"product_id":"carrier-subclr50hj402459-transformer-h30291","title":"OEM Carrier Transformer 40VA 208\/240V–24V for SUBCLR50HJ402459","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V — HT01BD209 for Model SUBCLR50HJ402459\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified control transformer for the \u003cstrong\u003eCarrier SUBCLR50HJ402459\u003c\/strong\u003e HVAC unit. Its job is to step down 208\/240V line voltage to a safe 24V signal that powers the thermostat, control board, contactor coil, and all low-voltage control circuits. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, no call for heating or cooling is processed, and the system will not respond at all. It is often the first component to check when everything appears powered but nothing responds.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA capacity | 208\/240V primary input | 24V secondary output | 50\/60 Hz | Class 2 control transformer | Replaces HT01BD207, HT01CN232, and 9076-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD209 is wound to exact Carrier factory tolerances, ensuring stable 24V output under full load. Generic transformers often exhibit voltage sag under load, which causes erratic control board behavior, nuisance lockouts, and premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power to the unit before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wires before disconnecting. Verify 24V output at secondary terminals with a meter before reconnecting controls.\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 Fits Carrier model \u003cstrong\u003eSUBCLR50HJ402459\u003c\/strong\u003e. Verify your existing transformer's VA rating and primary voltage on the unit data plate or wiring diagram before ordering. Need help confirming fitment? Our HVAC parts team is standing by — order with confidence and get back up and running today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640291512691,"sku":"CARRIE-SUBCLR50HJ402459-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640291545459,"sku":"CARRIE-SUBCLR50HJ402459-TRANSFORMER-HT01BD209-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-HT01BD209_83e94aad-2f80-4f8e-8878-332fd64ba08b.jpg?v=1782942448","url":"https:\/\/nationalhvacparts.com\/products\/carrier-subclr50hj402459-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}