{"product_id":"carrier-py3pna018040na-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 208\/240V–24V — PY3PNA018040NA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V for Model PY3PNA018040NA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part #HT01BD209) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3PNA018040NA\u003c\/strong\u003e system. The transformer steps down 208\/240V line voltage to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When it fails, the entire control circuit loses power: the thermostat goes blank, nothing responds, and the system shuts down completely with no error codes.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/240V primary | 24V secondary | 40VA rated | 50\/60 Hz | Factory-matched OEM tolerances | Also replaces HT01BD207, HT01CN232, and 9076-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances. Undersized or off-tolerance generic units can cause erratic low-voltage behavior, nuisance lockouts, or premature control board failure — especially under full 40VA load conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Turn off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Photograph existing wiring connections before disconnecting. Verify 24V output with a multimeter after installation before closing the panel.\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 Direct OEM replacement for Carrier model \u003cstrong\u003ePY3PNA018040NA\u003c\/strong\u003e. Also cross-references HT01BD207, HT01CN232, and 9076-00. Verify input voltage (208V or 240V) against your unit's data plate before ordering. Not sure it fits? Our team verifies fitment before you order — contact us and we'll confirm.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640404332915,"sku":"CARRIE-PY3PNA018040NA-TRANSFORMER-HT01BD209","price":87.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640404365683,"sku":"CARRIE-PY3PNA018040NA-TRANSFORMER-HT01BD209-GEN","price":77.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_3be6e900-82ad-41d6-ab79-ed4844290692.jpg?v=1775025804","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3pna018040na-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}