{"product_id":"carrier-py4gnaa60090aa-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 208\/240V–24V for PY4GNAA60090AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V — HT01BD209 for Model PY4GNAA60090AA\u003c\/h1\u003e\u003cp\u003eThis genuine OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY4GNAA60090AA\u003c\/strong\u003e packaged unit. The transformer steps down line voltage (208\/240V primary) to a safe 24V secondary signal that powers your thermostat, control board, and all low-voltage control circuitry. When this transformer fails, the entire control circuit loses power — resulting in a completely unresponsive system: the thermostat goes blank, no heating or cooling stages activate, and no error codes are displayed because the board itself has no power to communicate.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/240V Primary | 24V Secondary | 40VA rating | 50\/60 Hz | OEM part # HT01BD209 | Replaces HT01BD207, HT01CN232, and 9076-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and impedance tolerances required by Carrier's control board. Undersized or off-tolerance generic transformers can cause nuisance tripping, control board brownouts, or accelerated board failure — always use OEM when the control board is involved.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect before beginning. Tools needed: multimeter (to verify 0V before touching wiring), flathead and Phillips screwdrivers, needle-nose pliers, wire nuts or spade terminals. Photograph all wiring before disconnecting. Verify 24V output at secondary terminals before reassembling the unit.\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 Factory-matched for Carrier model \u003cstrong\u003ePY4GNAA60090AA\u003c\/strong\u003e packaged unit. Always verify your unit's data plate voltage matches 208\/240V primary input before ordering. Cross-references: HT01BD207, HT01CN232, 9076-00, 4000A46E07AE28. Questions about fitment? Our HVAC parts team confirms compatibility before you order — reach out before purchasing.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640328835443,"sku":"CARRIE-PY4GNAA60090AA-TRANSFORMER-HT01BD209","price":50.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640328868211,"sku":"CARRIE-PY4GNAA60090AA-TRANSFORMER-HT01BD209-GEN","price":44.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_f7c7fe88-028b-427b-9194-24e549db6c78.jpg?v=1775025745","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py4gnaa60090aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}