{"product_id":"carrier-py3gna042060aa-transformer-h30291","title":"OEM Carrier Transformer 40VA 208\/240V–24V for PY3GNA042060AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V — Model PY3GNA042060AA\u003c\/h1\u003e\u003cp\u003eThe Carrier HT01BD209 is the factory OEM control transformer for the \u003cstrong\u003eCarrier PY3GNA042060AA\u003c\/strong\u003e and related HVAC systems. This transformer steps down the 208\/240V line voltage to a clean 24V output that powers the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and safety switches. When this transformer fails, the result is often a completely unresponsive system: the thermostat goes blank, no relay clicks, and the unit refuses to start at all. A failed transformer may also blow the 3A control fuse repeatedly, making it easy to misdiagnose as a wiring or board problem.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/240V primary input | 24V secondary output | 40VA power rating | 50\/60 Hz | OEM part number HT01BD209 | Also supersedes HT01CN232 and HT01CN233\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact Carrier tolerances, ensuring stable 24V output under load. Undersized or off-spec aftermarket units can sag under peak current draw, causing nuisance lockouts 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 breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output post-install). Label and photograph all wiring before disconnecting. Total job time: approximately 20–30 minutes.\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 NationalHVACParts.com warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as a direct OEM drop-in replacement for the \u003cstrong\u003eCarrier PY3GNA042060AA\u003c\/strong\u003e. Verify your unit's control voltage requirement is 24V and line voltage is 208\/240V before ordering. Need fitment help? Our HVAC parts specialists verify compatibility before you buy — call or chat anytime.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640479240563,"sku":"CARRIE-PY3GNA042060AA-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640479273331,"sku":"CARRIE-PY3GNA042060AA-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_dc84ba4d-a77a-45a7-b8df-3370deda9864.jpg?v=1782942343","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gna042060aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}