{"product_id":"carrier-hgrh50hj442377-transformer-h30291","title":"OEM Carrier Transformer 40VA 120V\/24V for HGRH50HJ442377","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model HGRH50HJ442377\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier HGRH50HJ442377\u003c\/strong\u003e. It steps line voltage down from 120V to 24V to power the thermostat, control board, and all low-voltage control circuit components. When the transformer fails, the entire control circuit loses power — your thermostat goes blank, the system stops responding to calls for heating or cooling, and no error codes will display because the board itself is unpowered. It is one of the first components to check during a complete system no-response diagnosis.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01BD209 | Factory-matched output tolerance for stable low-voltage control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage specifications for the Carrier control circuit. Undersized or off-tolerance generic transformers can cause nuisance tripping, control board damage, or premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Always verify primary and secondary wire colors before disconnecting the old unit.\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 This transformer is the direct OEM replacement for \u003cstrong\u003eCarrier model HGRH50HJ442377\u003c\/strong\u003e. Always verify your existing transformer's VA rating and primary\/secondary voltages against the data plate inside your unit before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork required. Order today and receive same-day shipping on all in-stock parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909327507827,"sku":"CARRIE-HGRH50HJ442377-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909327540595,"sku":"CARRIE-HGRH50HJ442377-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_8e87949e-64f1-4acf-947b-9fb7484a3ce1.jpg?v=1782941657","url":"https:\/\/nationalhvacparts.com\/products\/carrier-hgrh50hj442377-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}