{"product_id":"carrier-hgrh50hj441456-transformer-h30291","title":"OEM Carrier Transformer 40VA 120V\/24V for HGRH50HJ441456","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model HGRH50HJ441456\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier HGRH50HJ441456\u003c\/strong\u003e. The transformer steps down line voltage from 120V to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the system will appear completely unresponsive: the thermostat goes blank, the unit won't call for heating or cooling, and no control functions operate. A failed transformer is often misdiagnosed as a thermostat or control board failure, making it the first component to test during a no-power diagnostic.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01BD209 | Factory-matched output for Carrier control circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to Carrier's exact VA rating and voltage tolerance. Undersized or off-brand transformers can sag under load, causing 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 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or terminals, multimeter to verify 24V output after installation. Label all low-voltage wiring before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for Carrier model \u003cstrong\u003eHGRH50HJ441456\u003c\/strong\u003e. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — no guesswork.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909328851315,"sku":"CARRIE-HGRH50HJ441456-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909328884083,"sku":"CARRIE-HGRH50HJ441456-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_b27ca369-f1b9-4331-a5af-5ea4ae0f1cbd.jpg?v=1782941647","url":"https:\/\/nationalhvacparts.com\/products\/carrier-hgrh50hj441456-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}