{"product_id":"carrier-py3pna024040nb-transformer-h30291","title":"OEM Carrier Transformer 40VA 120V→24V for PY3PNA024040NB","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD209 for Model PY3PNA024040NB\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3PNA024040NB\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching circuits. When this part fails, the entire control circuit goes dark — the thermostat loses power, the system becomes completely unresponsive, and no heating or cooling function can be initiated.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory OEM tolerance | Matches original footprint and wire terminals for direct drop-in replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM transformer built to exact VA and voltage specifications. Generic alternatives may carry insufficient VA capacity, causing thermal overload trips under normal control-circuit loads and premature failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Always label or photograph wire connections before removing the old unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock units ship 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\u003ePY3PNA024040NB\u003c\/strong\u003e packaged unit. Verify transformer VA rating and primary\/secondary voltages on your unit's data plate before ordering. Not sure it fits? Our technical team confirms fitment before you buy — reach out before placing your order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640401678707,"sku":"CARRIE-PY3PNA024040NB-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640401711475,"sku":"CARRIE-PY3PNA024040NB-TRANSFORMER-HT01BD209-GEN","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_146d5e2e-b1f6-4399-8c41-cc25786871a8.jpg?v=1775041469","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3pna024040nb-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}