{"product_id":"carrier-py3pna042090na-transformer-h30291","title":"OEM Carrier Transformer 40VA 208\/240V-24V for PY3PNA042090NA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V — Model PY3PNA042090NA\u003c\/h1\u003e\u003cp\u003eThe \u003cstrong\u003eCarrier HT01BD209\u003c\/strong\u003e is the factory-specified 40VA control transformer for the \u003cstrong\u003ePY3PNA042090NA\u003c\/strong\u003e packaged unit. The transformer steps down the line voltage from 208\/240V to the 24V signal required by the control board, thermostat, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dark — the thermostat loses communication, the system will not respond to calls for heating or cooling, and no safety fault codes will appear because the board itself has lost power. Replacing it with the correct OEM part restores proper voltage regulation and protects downstream components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input 208\/240V | Output 24V | Power Rating 40VA | Frequency 50\/60Hz | OEM Part # HT01BD209\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact factory VA tolerance, protecting sensitive control boards from voltage fluctuation. Generic aftermarket units may run outside spec, risking premature board failure and voiding system warranties.\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, wire stripper, multimeter. Label all low-voltage wires before disconnecting. Confirm input and output voltage with a meter after installation before restoring full power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer 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 Direct OEM replacement for Carrier model \u003cstrong\u003ePY3PNA042090NA\u003c\/strong\u003e packaged units. Verify 208\/240V primary and 24V secondary on your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — contact us today and we'll get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640384737651,"sku":"CARRIE-PY3PNA042090NA-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640384770419,"sku":"CARRIE-PY3PNA042090NA-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_d0d18108-7aeb-4719-9f54-cb0a697f09a8.jpg?v=1782942232","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3pna042090na-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}