{"product_id":"carrier-py4gpaa36090aa-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 120V–24V for PY4GPAA36090AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V–24V for Model PY4GPAA36090AA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY4GPAA36090AA\u003c\/strong\u003e packaged unit. The transformer steps down line voltage (120V primary) to the 24V AC signal used by the low-voltage control circuit — powering the thermostat, contactor coils, gas valve, and all safety controls. When the transformer fails, the entire control circuit goes dark: the thermostat shows no power, nothing responds to a call for heating or cooling, and the system appears completely dead.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01BD209 | Factory-matched winding and mounting dimensions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the exact factory OEM transformer. OEM units are wound to precise VA tolerances, ensuring reliable coil pull-in and preventing nuisance tripping of the built-in secondary fuse. Generic transformers can run under-rated, causing overheating and premature failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always disconnect power at the disconnect box before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 24V output after install). Label all low-voltage wires 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 Engineered for the Carrier \u003cstrong\u003ePY4GPAA36090AA\u003c\/strong\u003e packaged unit. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640315335027,"sku":"CARRIE-PY4GPAA36090AA-TRANSFORMER-HT01BD209","price":40.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640315367795,"sku":"CARRIE-PY4GPAA36090AA-TRANSFORMER-HT01BD209-GEN","price":35.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_484fc890-7ce1-401c-8bce-9746b9bc25b2.jpg?v=1775025403","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py4gpaa36090aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}