{"product_id":"carrier-py3gna048090ab-transformer-h30291","title":"OEM Carrier Transformer 40VA 208\/240V–24V for PY3GNA048090AB","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V — HT01BD209 for Model PY3GNA048090AB\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier control transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3GNA048090AB\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 208\/240V to the 24V signal required to power the thermostat, control board, and all low-voltage switching circuits. When this transformer fails, the entire control circuit goes dark — the thermostat becomes unresponsive, relays won't energize, and the system will not heat, cool, or circulate air. A failed transformer is often misdiagnosed as a bad thermostat or control board, so always confirm 24V output at the secondary terminals before replacing other components.\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\/60Hz | OEM part number HT01BD209 | Factory-matched tolerance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD209 is wound and rated to exact factory specifications. Generic substitutes frequently run undersized VA ratings, causing nuisance tripped breakers on transformer secondaries and premature failure — especially in systems with multiple low-voltage accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always disconnect power at the disconnect and breaker before servicing. Tools needed: multimeter (verify 0V before touching wires), flat-head screwdriver, wire stripper, and needle-nose pliers. Photograph all wire connections before removal. Verify 24V output after installation before closing the panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer 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\u003ePY3GNA048090AB\u003c\/strong\u003e packaged unit. Verify your unit's data plate shows a 208\/240V primary and 24V secondary control circuit before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — contact us today and get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640474751347,"sku":"CARRIE-PY3GNA048090AB-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640474784115,"sku":"CARRIE-PY3GNA048090AB-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_20a52b5a-417f-4e06-a14d-afbf27f29e5d.jpg?v=1782942351","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gna048090ab-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}