{"product_id":"carrier-py3gnaa48115na-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 208\/240V–24V for PY3GNAA48115NA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V for Model PY3GNAA48115NA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3GNAA48115NA\u003c\/strong\u003e packaged unit. The transformer steps down the 208\/240V line voltage to the 24V signal voltage that powers your thermostat, control board, contactor coil, and all other low-voltage control circuit components. When this transformer fails, the entire control circuit goes dark — your thermostat becomes unresponsive, the system won't cycle on, and no error codes will appear because the board itself has lost power.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/240V Primary | 24V Secondary | 40VA Rating | 50\/60Hz | Class 2 Control Transformer — factory-matched to Carrier OEM spec\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e Genuine Carrier OEM transformers are wound to exact VA and voltage tolerances. Undersized or out-of-spec generic units can brown out control boards and shorten contactor coil life — always match the original VA rating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Always switch off line voltage at the disconnect and confirm zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all low-voltage and line-voltage wiring connections before disconnecting. Reconnect secondary (24V) wires first, then primary (line voltage) wires.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Ships same business day from our warehouse. Also replaces legacy part numbers HT01BD207 and HT01CN232.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for Carrier model \u003cstrong\u003ePY3GNAA48115NA\u003c\/strong\u003e packaged units. Verify your existing transformer's primary voltage (208\/240V), secondary voltage (24V), and VA rating (40VA) against your unit data plate before ordering. Not sure it fits? Our HVAC parts team confirms fitment before you buy — order with confidence and get it shipped today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640446767475,"sku":"CARRIE-PY3GNAA48115NA-TRANSFORMER-HT01BD209","price":56.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640446800243,"sku":"CARRIE-PY3GNAA48115NA-TRANSFORMER-HT01BD209-GEN","price":50.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_352920cc-bba5-4fed-9a3c-ec0b98ada98c.jpg?v=1775025687","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gnaa48115na-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}