{"product_id":"carrier-py3gpaa42090na-transformer-h30291","title":"OEM Carrier 40VA Transformer 208\/230V–24V for PY3GPAA42090NA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer 208\/230V to 24V for Model PY3GPAA42090NA\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM control transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier PY3GPAA42090NA\u003c\/strong\u003e packaged HVAC unit. The transformer steps down 208\/230V line voltage to the 24V signal required to power the thermostat, control board, contactor coil, and all low-voltage components. When this transformer fails, the entire control circuit goes dark — symptoms include a completely unresponsive thermostat, a system that won't call for heating or cooling, and a control board that shows no status LED activity. This is one of the first parts to test when nothing appears to work at all.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/230V Primary | 24V Secondary | 40VA capacity | 50\/60Hz | Class 2 control transformer | Direct OEM replacement for 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 tolerance, ensuring the 24V secondary holds steady under full control-circuit load. Undersized or off-spec generics can sag under load, causing erratic board behavior, nuisance lockouts, or premature contactor failure.\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 beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wires before disconnecting. Verify 24V output at secondary terminals after install 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 Engineered as the direct OEM replacement for \u003cstrong\u003eCarrier model PY3GPAA42090NA\u003c\/strong\u003e. Also replaces obsolete Carrier part numbers HT01BD207, HT01CN232, and 9076-00. Confirm primary voltage matches your unit's supply voltage (208V or 230V) before ordering — check the data plate inside the unit's electrical panel. Need help verifying fitment? Our HVAC parts team is standing by to confirm before you order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640437789043,"sku":"CARRIE-PY3GPAA42090NA-TRANSFORMER-HT01BD209","price":56.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640437821811,"sku":"CARRIE-PY3GPAA42090NA-TRANSFORMER-HT01BD209-GEN","price":49.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_925a3c36-0040-46ca-b351-97a03330caee.jpg?v=1775016425","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gpaa42090na-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}