{"product_id":"carrier-py3pna048090ab-transformer-h30291","title":"OEM Carrier Transformer 40VA 208\/240V–24V for PY3PNA048090AB","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V for Model PY3PNA048090AB\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3PNA048090AB\u003c\/strong\u003e packaged unit. The transformer steps down 208\/240V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage switching circuits. When this part fails, the entire control circuit goes dead — the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and no error codes appear because the board itself has lost power.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 208\/240V primary input | 24V secondary output | 50\/60 Hz | Factory-matched Carrier OEM tolerances\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and potted to Carrier's exact VA rating and insulation class. Generic units are often undersized or loosely rated, causing voltage sag under full load that triggers nuisance lockouts and accelerates control board wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power and confirm zero voltage at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Always photograph and label low-voltage wiring connections before removal. Confirm secondary output reads 24–28V AC after installation before restoring full 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 Direct OEM replacement for Carrier model \u003cstrong\u003ePY3PNA048090AB\u003c\/strong\u003e packaged gas\/electric units. Cross-references: HT01CN232, HT01CN233. Verify your unit's data plate voltage before ordering — this transformer is rated for 208\/240V primary only. Not for use on 120V primary applications. Questions about fitment? Our HVAC parts specialists verify compatibility before you order — contact us today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640383164787,"sku":"CARRIE-PY3PNA048090AB-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640383197555,"sku":"CARRIE-PY3PNA048090AB-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_7374b969-508b-4d26-90c7-7cb5c27d81c6.jpg?v=1782942408","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3pna048090ab-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}