{"product_id":"carrier-py3gnaa24040aa-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 208\/240V–24V — PY3GNAA24040AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V for Model PY3GNAA24040AA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM control transformer for the \u003cstrong\u003eCarrier PY3GNAA24040AA\u003c\/strong\u003e packaged unit, identified by part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e. The transformer steps down line voltage (208\/240V) to the 24V signal that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When it fails, the result is complete loss of control circuit function — a blank thermostat, a system that won't respond to any call for heating or cooling, or a tripped secondary fuse caused by a shorted low-voltage circuit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA | 208\/240V primary | 24V secondary | 50\/60 Hz | Replaces HT01BD207, HT01CN232 \u0026amp; 9076-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances. Undersized or off-tolerance aftermarket units can overheat, blow fuses repeatedly, or damage sensitive control boards over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — De-energize the unit at the disconnect before starting. Tools needed: multimeter (verify 0V at transformer terminals), flathead and Phillips screwdrivers, wire nuts or spade connectors. Always confirm primary and secondary wiring polarity matches the old unit before powering back up.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Same-business-day shipping from our warehouse stock.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for \u003cstrong\u003eCarrier PY3GNAA24040AA\u003c\/strong\u003e packaged units. Verify existing transformer VA rating and primary voltage on your unit's data plate before ordering. Cross-references: HT01BD207, HT01CN232, 9076-00. Need help confirming fitment? Our team checks compatibility before you order — ships today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640462070131,"sku":"CARRIE-PY3GNAA24040AA-TRANSFORMER-HT01BD209","price":50.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640462102899,"sku":"CARRIE-PY3GNAA24040AA-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_04b9638c-e436-4535-9c96-ac8502fa8a76.jpg?v=1775025780","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gnaa24040aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}