{"product_id":"carrier-py3pna024040aa-transformer-h30291","title":"OEM Carrier Transformer 40VA 208\/240V–24V for PY3PNA024040AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V — Model PY3PNA024040AA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part #HT01BD209) is the factory-specified control transformer for the \u003cstrong\u003eCarrier PY3PNA024040AA\u003c\/strong\u003e packaged HVAC unit. Its job is critical and simple: step down the 208\/240V line voltage to the 24V low-voltage signal used by your thermostat, control board, contactor coil, and every other control-circuit component. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any call for heating or cooling, and a multimeter at the secondary terminals will read zero volts instead of 24V.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input 208\/240V | Output 24V | 40VA power rating | 50\/60Hz | Factory OEM part #HT01BD209 | Direct drop-in fit for PY3PNA024040AA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and potted to Carrier's exact tolerances. Generic aftermarket units often run outside ±5% output voltage, which can cause nuisance lockouts, erratic board behavior, and premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph or label all low-voltage wire connections before removing the old unit. Verify 24V at secondary terminals after reinstall before closing the panel.\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 Engineered for the Carrier \u003cstrong\u003ePY3PNA024040AA\u003c\/strong\u003e packaged unit. Also fits additional Carrier, Bryant, and Payne models that specify the HT01BD209 control transformer — verify your unit's model and data plate before ordering. Not sure? Our HVAC parts specialists confirm fitment at no charge before you buy. Order today and get same-day shipping on all in-stock parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640403939699,"sku":"CARRIE-PY3PNA024040AA-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640403972467,"sku":"CARRIE-PY3PNA024040AA-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_d8791f1b-88e7-4580-84c1-969767c8122e.jpg?v=1782942388","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3pna024040aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}