{"product_id":"carrier-py1pnb024040aaaa-transformer-h30291","title":"OEM Carrier Transformer 40VA 208\/240V–24V for PY1PNB024040AAAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V for Model PY1PNB024040AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement control transformer for the \u003cstrong\u003eCarrier PY1PNB024040AAAA\u003c\/strong\u003e HVAC system, supplied under part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e. The transformer steps down line voltage (208\/240V) to the 24V signal used by your thermostat, control board, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dark — your thermostat displays nothing, your system won't respond to a call for heat or cool, and no contactor or gas valve will energize. It is frequently the first part to check when a system appears completely unresponsive despite normal line-voltage power.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input 208\/240V | Output 24V | 40VA power rating | 50\/60 Hz | OEM part number HT01BD209\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM Carrier transformers are wound to exact VA tolerances, protecting downstream components like control boards and gas valves from voltage sag under load — a common failure mode with undersized aftermarket units.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdriver, needle-nose pliers, multimeter to verify 24V output after install. Label all low-voltage wiring before disconnecting.\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 Fits Carrier model \u003cstrong\u003ePY1PNB024040AAAA\u003c\/strong\u003e. Verify input voltage on your unit's data plate (208V or 240V single-phase) before ordering to confirm this is the correct transformer for your application. Have your model and serial number ready? Our parts team verifies fitment before your order ships — reach out before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640909058419,"sku":"CARRIE-PY1PNB024040AAAA-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640909091187,"sku":"CARRIE-PY1PNB024040AAAA-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_626182c9-cdbc-4de2-886d-ec4f0923b4ab.jpg?v=1782942252","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py1pnb024040aaaa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}