{"product_id":"carrier-py3pna024040na-transformer-h30291","title":"OEM Carrier Control Transformer 120V–24V 40VA for PY3PNA024040NA","description":"\u003ch1\u003eOEM Carrier Control Transformer 120V–24V 40VA for Model PY3PNA024040NA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier control transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3PNA024040NA\u003c\/strong\u003e packaged unit. The transformer steps down line voltage (120V primary) to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching circuits. When this part fails, the entire control circuit goes dead — the thermostat loses power, the system stops responding to calls for heating or cooling, and no fault codes are generated because the board itself has no power to report them.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 120V primary | 24V secondary output | 40VA rated | Factory-matched OEM tolerance | Spade or screw terminal connections\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and rated to exact factory VA specifications, ensuring the 24V rail stays stable under full control-circuit load. Generic units can sag under load, causing intermittent lockouts, nuisance tripping of the secondary fuse, and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output after install), wire nuts or spade connectors. Photograph all wiring before disconnecting the old transformer.\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 Engineered as a direct OEM fit for Carrier model \u003cstrong\u003ePY3PNA024040NA\u003c\/strong\u003e. Always verify primary voltage and VA rating on your unit's data plate before ordering. If you are unsure of fitment, our HVAC parts specialists can confirm compatibility before you purchase — same-day shipping available on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640402628979,"sku":"CARRIE-PY3PNA024040NA-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640402661747,"sku":"CARRIE-PY3PNA024040NA-TRANSFORMER-HT01BD209-GEN","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209.jpg?v=1775025364","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3pna024040na-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}