{"product_id":"carrier-py2ppb042090aa-transformer-h30291","title":"OEM Carrier Transformer 40VA 208\/240V–24V for PY2PPB042090AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V for Model PY2PPB042090AA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part #HT01BD209) is the factory-specified 40VA step-down transformer for the \u003cstrong\u003eCarrier PY2PPB042090AA\u003c\/strong\u003e packaged unit. It converts 208\/240V line voltage down to the 24V DC signal required to power the control board, thermostat circuit, and all low-voltage controls. When this transformer fails, the entire control circuit goes dead — the system will not respond to the thermostat, will not initiate any heating or cooling sequence, and may appear completely unresponsive. A blown fuse on the secondary side is often the first clue a transformer has shorted or been overloaded.\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 | Factory OEM part #HT01BD209\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA tolerances for your unit's control load. Undersized or off-tolerance generic units can overheat, trip thermal protection, or fail prematurely under peak demand — putting the entire control circuit at risk.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph or label all wiring connections before removal. Verify 24V output with a multimeter after installation before restoring system 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 as a direct OEM replacement for the Carrier \u003cstrong\u003ePY2PPB042090AA\u003c\/strong\u003e packaged unit. Verify your existing transformer's input voltage, output voltage, and VA rating against your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — order with confidence.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640512205171,"sku":"CARRIE-PY2PPB042090AA-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640512237939,"sku":"CARRIE-PY2PPB042090AA-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_c0bcb1a0-ec2a-438c-bf18-4b4e3057ba4c.jpg?v=1782942318","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py2ppb042090aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}