{"product_id":"carrier-py3gnaa30040na-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 208\/240V–24V — PY3GNAA30040NA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V for Model PY3GNAA30040NA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3GNAA30040NA\u003c\/strong\u003e system. The transformer steps down line voltage from 208\/240V to the 24V signal required by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this component fails, the entire 24V control circuit goes dark — the thermostat becomes unresponsive, the system will not energize, and no call for heating or cooling is answered. It is one of the first components an experienced technician checks when a unit shows zero response to any thermostat command.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA capacity | 208\/240V primary input | 24V secondary output | 50\/60 Hz | Class 2 control transformer | Factory-matched Carrier OEM specification\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM part built to exact factory tolerances. Generic transformers may carry higher VA ripple and looser voltage output tolerances, which can stress sensitive control boards and solid-state components over time. OEM is the only safe choice for critical 24V control circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before touching any wiring. Tools needed: flat-head and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all low-voltage wiring before disconnecting. Confirm output voltage with a multimeter after installation before restoring full power.\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 Designed for the Carrier \u003cstrong\u003ePY3GNAA30040NA\u003c\/strong\u003e. Also replaces legacy part numbers HT01BD207, HT01CN232, and 9076-00. Always verify your unit's data plate voltage specifications match the 208\/240V primary rating before ordering. Our team is available to confirm fitment — just reach out before you buy. \u003cstrong\u003eOrder today and receive same-day shipping on all in-stock parts.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640459678067,"sku":"CARRIE-PY3GNAA30040NA-TRANSFORMER-HT01BD209","price":87.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640459710835,"sku":"CARRIE-PY3GNAA30040NA-TRANSFORMER-HT01BD209-GEN","price":77.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_f2cd2b9d-0c38-46b6-b1a2-30a6291be4ee.jpg?v=1775025783","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gnaa30040na-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}