{"product_id":"carrier-py3gna048115na-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 208\/240V–24V — PY3GNA048115NA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V for Model PY3GNA048115NA\u003c\/h1\u003e\u003cp\u003eThe \u003cstrong\u003eCarrier HT01BD209\u003c\/strong\u003e is the factory-specified 40VA step-down control transformer for the \u003cstrong\u003ePY3GNA048115NA\u003c\/strong\u003e packaged HVAC unit. This transformer converts the line-voltage power supply (208\/240V primary) down to the 24V AC signal that powers the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, the system goes completely silent: no thermostat display, no blower, no heating or cooling response. A failed transformer is often traced to a shorted control wire or a failed component that caused an overcurrent event, so always inspect the control circuit before installing the replacement.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e OEM Part # HT01BD209 | Input: 208\/240V AC | Output: 24V AC | Rating: 40VA | Frequency: 50\/60 Hz | Factory-matched to Carrier PY3GNA048115NA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine Carrier OEM transformer, wound and insulated to factory specifications. Generic transformers rated at 40VA can exhibit voltage sag under full control-circuit load, leading to erratic thermostat behavior or nuisance lockouts — a risk the OEM unit eliminates.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output and check for control circuit shorts before energizing). Always inspect low-voltage wiring for chafing or shorts prior to installation.\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\u003ePY3GNA048115NA\u003c\/strong\u003e packaged HVAC unit. Verify your unit's data plate voltage ratings (208\/240V primary, 24V secondary, 40VA) before ordering. Not sure it's the right part? Our HVAC parts specialists are available to confirm fitment before you buy — call or chat today for same-day shipping assistance.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640472621427,"sku":"CARRIE-PY3GNA048115NA-TRANSFORMER-HT01BD209","price":55.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640472654195,"sku":"CARRIE-PY3GNA048115NA-TRANSFORMER-HT01BD209-GEN","price":48.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_0bc5e674-5a86-4e6c-a516-083d06775455.jpg?v=1775025778","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gna048115na-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}