{"product_id":"carrier-py3pna024040ab-transformer-h30291","title":"OEM Carrier Transformer 120V–24V 40VA for PY3PNA024040AB","description":"\u003ch1\u003eOEM Carrier Control Transformer 120V–24V 40VA for Model PY3PNA024040AB\u003c\/h1\u003e\u003cp\u003eThis OEM replacement control transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified unit for the \u003cstrong\u003eCarrier PY3PNA024040AB\u003c\/strong\u003e system. The transformer steps down line voltage (120V) to the 24V signal voltage that powers your thermostat, control board, and all low-voltage control circuits. When this part fails, the entire control system goes dark — the thermostat loses power, the system will not respond to any calls for heating or cooling, and no fault codes will display on the board.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01BD209 | Factory-matched construction for Carrier PY3PNA024040AB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine Carrier OEM transformer, wound to exact VA and voltage specifications. Generic aftermarket transformers often have looser voltage regulation and lower-quality insulation, risking repeated control board failures or nuisance tripping.\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: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after installation. Photograph all wiring connections before disconnecting the old transformer.\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 \u003cstrong\u003eCarrier model PY3PNA024040AB\u003c\/strong\u003e. Verify your existing transformer's primary\/secondary voltage and VA rating on its label before ordering to confirm fitment. Our parts specialists are available to verify compatibility before you buy — order with confidence and get it shipped today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640403448179,"sku":"CARRIE-PY3PNA024040AB-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640403480947,"sku":"CARRIE-PY3PNA024040AB-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_eee86392-2cc4-4fbf-b791-73ea38652f41.jpg?v=1775041077","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3pna024040ab-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}