{"product_id":"carrier-hgrh50hj441135-transformer-h30291","title":"OEM Carrier Transformer 40VA 120V\/24V for HGRH50HJ441135","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model HGRH50HJ441135\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier HGRH50HJ441135\u003c\/strong\u003e. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuits. When this transformer fails, absolutely nothing in the system responds — no thermostat display, no contactor pull-in, no ignition sequence. It is one of the most overlooked yet critical components in any HVAC system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V AC | OEM part number HT01BD209 | Factory-matched impedance and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers like this HT01BD209 include factory-spec thermal cutoffs and exact VA ratings. Undersized or off-brand transformers can overload and fail quickly when multiple 24V accessories (humidifiers, zone boards, UV lights) draw simultaneously.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 24V output across secondary terminals after installation before restoring full system power.\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 specifically for the Carrier \u003cstrong\u003eHGRH50HJ441135\u003c\/strong\u003e. Confirm your unit's control circuit voltage and VA demand on the data plate before ordering. If you're unsure of fitment, our HVAC parts specialists verify compatibility before your order ships — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909329932659,"sku":"CARRIE-HGRH50HJ441135-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909329965427,"sku":"CARRIE-HGRH50HJ441135-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_25387fa2-fea6-4010-b6d5-a191f32f79ab.jpg?v=1782941635","url":"https:\/\/nationalhvacparts.com\/products\/carrier-hgrh50hj441135-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}