{"product_id":"carrier-py3gna030040aa-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 208\/230V–24V — PY3GNA030040AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/230V to 24V for Model PY3GNA030040AA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3GNA030040AA\u003c\/strong\u003e HVAC system. The transformer steps down high-voltage line power (208\/230V) to the 24V signal voltage that runs your thermostat, control board, relays, and all low-voltage components. When this transformer fails, the entire control circuit goes dark — you'll see a blank thermostat, no response to calls for heating or cooling, and no board activity whatsoever. It is one of the most commonly overlooked failure points in a complete system no-start diagnosis.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 208\/230V primary input | 24V secondary output | 50\/60 Hz | Class 2 control transformer | Approx. 1 lb.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM part, wound to exact factory VA and voltage tolerances. Undersized or off-spec aftermarket transformers can sag under full control-circuit load, causing intermittent lockouts and premature board failures.\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: flathead and Phillips screwdrivers, wire stripper, multimeter (verify 24V output after install). Label all wires before disconnecting. This is a straightforward swap for any experienced DIYer or technician.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as a direct OEM replacement for \u003cstrong\u003eCarrier model PY3GNA030040AA\u003c\/strong\u003e. This part also replaces prior Carrier transformer part numbers \u003cstrong\u003eHT01BD207\u003c\/strong\u003e, \u003cstrong\u003eHT01CN232\u003c\/strong\u003e, and \u003cstrong\u003e9076-00\u003c\/strong\u003e — verify your unit's data plate and existing wiring configuration before ordering. Have a fitment question? Our HVAC parts specialists confirm compatibility before your order ships.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640486285683,"sku":"CARRIE-PY3GNA030040AA-TRANSFORMER-HT01BD209","price":87.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640486318451,"sku":"CARRIE-PY3GNA030040AA-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_a589e5d9-8486-48ab-ba2f-cf2a23640665.jpg?v=1775025539","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gna030040aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}