{"product_id":"carrier-py3gpaa60090na-transformer-h30291","title":"OEM Carrier 40VA Transformer 120V–24V for PY3GPAA60090NA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model PY3GPAA60090NA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3GPAA60090NA\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and all safety switches. When this component fails, the system goes completely silent: no thermostat response, no contactor pull-in, and no call-for-heat or call-for-cool. A blown transformer is commonly caused by a shorted control wire, a failed contactor coil, or a mis-wired thermostat that overloads the secondary circuit.\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 | Mount type: bracket\/chassis mount | OEM part number: HT01BD209\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit meets Carrier's exact VA rating and insulation class, ensuring the secondary circuit is never under-powered. Generic transformers often run underrated VA, causing nuisance trips and premature failure under peak load conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output after install). Label all low-voltage wires before disconnecting. Inspect all control wiring for shorts before energizing — a shorted wire is the #1 cause of transformer failure.\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 for the Carrier \u003cstrong\u003ePY3GPAA60090NA\u003c\/strong\u003e packaged gas\/electric unit. Always verify your unit's data plate voltage requirements match before installation. Our parts specialists are available to confirm fitment before you order — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640433824115,"sku":"CARRIE-PY3GPAA60090NA-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640433856883,"sku":"CARRIE-PY3GPAA60090NA-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_a004dd76-276b-4f91-b5d6-29867be7f0bd.jpg?v=1775016368","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gpaa60090na-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}