{"product_id":"carrier-py3gnaa42090aa-transformer-h30291","title":"OEM Carrier Transformer 40VA 208\/230V–24V for PY3GNAA42090AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/230–24V for Model PY3GNAA42090AA\u003c\/h1\u003e\u003cp\u003eThe \u003cstrong\u003eCarrier HT01BD209\u003c\/strong\u003e is the factory OEM control transformer for the \u003cstrong\u003ePY3GNAA42090AA\u003c\/strong\u003e HVAC system. This transformer steps down 208\/230V line voltage to the 24V signal voltage that powers your thermostat, control board, contactor coil, and all other low-voltage control components. When this transformer fails, the entire control circuit goes dark — the thermostat goes blank, nothing responds to a call for heating or cooling, and the system appears completely dead. It is one of the most common and most misdiagnosed failures in residential and light commercial HVAC systems.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/230V Primary | 24V Secondary | 40VA rated | 50\/60 Hz | Class 2 control transformer | OEM Part # HT01BD209\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM transformer wound to exact factory VA and voltage specifications. Generic transformers often run low on secondary voltage under load, causing erratic thermostat behavior, nuisance lockouts, and premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire labels or tape. Photograph all wiring connections before disconnecting. Primary wires connect to line voltage terminals; secondary wires feed the 24V control circuit.\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 for the Carrier \u003cstrong\u003ePY3GNAA42090AA\u003c\/strong\u003e. Also replaces legacy Carrier part numbers HT01BD207, HT01CN232, and 9076-00. Verify your unit's control transformer VA rating and primary voltage on the equipment data plate before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — just reach out before placing your order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640448766323,"sku":"CARRIE-PY3GNAA42090AA-TRANSFORMER-HT01BD209","price":50.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640448799091,"sku":"CARRIE-PY3GNAA42090AA-TRANSFORMER-HT01BD209-GEN","price":44.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_c0bb4aee-dd9e-4265-844a-6d380c658a10.jpg?v=1775041635","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gnaa42090aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}