{"product_id":"carrier-py4gnaa30060aa-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 208\/240V–24V — PY4GNAA30060AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V for Model PY4GNAA30060AA\u003c\/h1\u003e\u003cp\u003eThis genuine OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY4GNAA30060AA\u003c\/strong\u003e packaged unit. The transformer steps down 208\/240V line voltage to the 24V DC signal that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When it fails, the entire control circuit goes dark — you'll see a blank thermostat display, no response to calls for heating or cooling, and potentially a tripped low-voltage fuse. Replacing this transformer is almost always the fastest and most cost-effective fix for a completely unresponsive unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA output | 208\/240V primary | 24V secondary | 50\/60 Hz rated | Replaces OEM part numbers HT01BD207, HT01CN232, and 9076-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD209 is factory-wound to exact VA and voltage tolerances, ensuring the control board, contactor coil, and thermostat receive clean, stable 24V power. Generic substitutes may run slightly high or low on secondary voltage, causing nuisance lockouts or premature board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade connectors, multimeter. Photograph all wiring connections before removing the old transformer. Secondary fuse should be inspected and replaced if blown.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Factory-matched for Carrier model \u003cstrong\u003ePY4GNAA30060AA\u003c\/strong\u003e packaged HVAC unit. Also compatible with select Bryant and Payne models using the same 40VA 208\/240V–24V transformer specification. Always verify your unit's data plate voltage before ordering. Have questions about fitment? Our HVAC parts team confirms compatibility before you buy — no guesswork.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640332407155,"sku":"CARRIE-PY4GNAA30060AA-TRANSFORMER-HT01BD209","price":87.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640332439923,"sku":"CARRIE-PY4GNAA30060AA-TRANSFORMER-HT01BD209-GEN","price":77.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_abbb2322-0414-4da9-a107-2758ca272ca5.jpg?v=1775025819","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py4gnaa30060aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}