{"product_id":"carrier-py3gna042090na-transformer-h30291","title":"OEM Carrier Transformer 40VA 208\/240V–24V for PY3GNA042090NA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V for Model PY3GNA042090NA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part #HT01BD209) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3GNA042090NA\u003c\/strong\u003e packaged unit. The transformer steps down the high-voltage supply (208\/240V) to the 24V signal voltage that powers every component in the control circuit — thermostat, contactor coil, gas valve, and control board. When it fails, the entire system goes silent: no call-for-heat, no call-for-cool, no fan response. Nothing works until the transformer is replaced.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/240V primary input | 24V secondary output | 40VA power rating | 50\/60 Hz | OEM part #HT01BD209 | Factory-matched for \u003cstrong\u003ePY3GNA042090NA\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine Carrier OEM transformer, wound to exact VA and voltage tolerances. Generic aftermarket transformers often run outside ±5% tolerance, causing nuisance board faults, burnt coils, and premature component failure across the entire control circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box and confirm zero voltage with a multimeter before touching any wiring. Photograph or label all low-voltage wires before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Typical replacement time: 20–30 minutes.\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 drop-in for \u003cstrong\u003eCarrier PY3GNA042090NA\u003c\/strong\u003e packaged units. Verify your unit's data plate shows a 208\/240V primary and 24V secondary control circuit before ordering. Our parts specialists are available to confirm fitment — order with confidence and get your system back online today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640476356979,"sku":"CARRIE-PY3GNA042090NA-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640476389747,"sku":"CARRIE-PY3GNA042090NA-TRANSFORMER-HT01BD209-GEN","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-HT01BD209_cc0a1715-3eb0-44ff-8a69-2403a6390d5c.jpg?v=1782942348","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gna042090na-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}