{"product_id":"carrier-py3gna036090aa-transformer-h30291","title":"OEM Carrier 24V Control Transformer HT01BD209 for PY3GNA036090AA","description":"\u003ch1\u003eOEM Carrier 24V Control Transformer HT01BD209 for Model PY3GNA036090AA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3GNA036090AA\u003c\/strong\u003e packaged HVAC unit. The transformer steps down 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, the entire system goes dark: the thermostat loses power, no relays energize, and nothing operates. A blown transformer is often the first sign of a shorted wire or faulty component elsewhere in the 24V circuit, so always inspect the low-voltage wiring before installing a replacement.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Primary: 120V AC | Secondary: 24V AC | VA rating: 40VA (typical factory spec) | Terminal-style connections | UL-recognized component | Factory-matched for Carrier PY3GNA036090AA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound to Carrier's exact VA and impedance specifications. Generic transformers are often under-rated in VA, causing overheating and premature failure — especially on systems with multiple 24V loads such as zone boards or dual-fuel controls.\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, multimeter (to verify 24V output after install and to check for shorts before energizing). Always confirm no short circuit exists in the 24V circuit before installing a new 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 Engineered as a direct OEM replacement for Carrier model \u003cstrong\u003ePY3GNA036090AA\u003c\/strong\u003e. Verify your unit's control circuit voltage and VA requirements on the data plate before ordering. If your old transformer shows signs of burn marks or a tripped internal fuse, inspect all downstream 24V wiring for shorts before powering up. Need fitment confirmation? Our HVAC parts specialists verify compatibility before every order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640481075571,"sku":"CARRIE-PY3GNA036090AA-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640481108339,"sku":"CARRIE-PY3GNA036090AA-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_96036dff-6598-4528-82bb-7d1f9c4bec45.jpg?v=1775015773","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gna036090aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}