{"product_id":"carrier-py2pnb042090aa-transformer-h30291","title":"OEM Carrier Transformer 40VA 208\/240V–24V for PY2PNB042090AA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer 208\/240V to 24V for Model PY2PNB042090AA\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM Carrier replacement transformer (part #HT01BD209) factory-specified for the \u003cstrong\u003eCarrier PY2PNB042090AA\u003c\/strong\u003e. The control transformer steps down line voltage (208\/240V) to the 24V signal voltage that powers your thermostat, contactor coil, control board, and every other low-voltage component in the system. When this transformer fails, the entire control circuit loses power — resulting in a completely unresponsive system, a blank thermostat, or a unit that won't start under any call for heating or cooling.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input 208\/240V | Output 24V | 40VA power rating | 50\/60 Hz | OEM part number HT01BD209 | Factory-matched construction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD209 is wound and insulated to Carrier's exact factory specification. Generic transformers frequently carry looser VA tolerances, which can overload under peak demand and damage downstream control boards — an expensive secondary failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power and verify 0V at the unit before touching any wiring. Tools needed: multimeter, flathead and Phillips screwdrivers, wire stripper. Note wire colors and terminal positions before disconnecting the old unit. A quick continuity check of secondary output (should read ~24–28V AC) confirms successful installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty included. 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 the factory replacement for Carrier model \u003cstrong\u003ePY2PNB042090AA\u003c\/strong\u003e. Always confirm input voltage on your unit's data plate (208V or 240V) before ordering. Not sure it fits? Our HVAC parts team verifies compatibility before you buy — order with confidence.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640539074931,"sku":"CARRIE-PY2PNB042090AA-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640539107699,"sku":"CARRIE-PY2PNB042090AA-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_6e0c026a-9679-4c0e-bc57-79c5af5c94ae.jpg?v=1782942298","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py2pnb042090aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}