{"product_id":"carrier-py3gna042090ab-transformer-h30291","title":"OEM Carrier Transformer 40VA 120V–24V for PY3GNA042090AB","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V–24V for Model PY3GNA042090AB\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3GNA042090AB\u003c\/strong\u003e packaged unit. The transformer converts 120V line voltage to the 24V AC signal that powers the control board, thermostat circuit, and all low-voltage switching in the system. When this component fails, the entire control circuit goes dead — no thermostat response, no contactor pull-in, and no ignition sequence will occur, making it one of the first components to check when diagnosing a completely unresponsive unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | Class 2 transformer | Factory-matched output tolerance for stable control-circuit voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD209 is wound and potted to Carrier's exact VA and voltage specifications. Generic transformers may output slightly off-voltage 24V, which can cause nuisance lockouts, erratic board behavior, or premature control board failure over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before replacing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all low-voltage wire connections before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders ship same business day from our warehouse when placed before 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as a direct OEM replacement for Carrier model \u003cstrong\u003ePY3GNA042090AB\u003c\/strong\u003e. Always verify the VA rating and primary\/secondary voltages against your unit's data plate and existing transformer label before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640477045107,"sku":"CARRIE-PY3GNA042090AB-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640477077875,"sku":"CARRIE-PY3GNA042090AB-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_865c0150-c0ff-499a-8620-f9e54eb58c6b.jpg?v=1775041423","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gna042090ab-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}