{"product_id":"payne-pa3znb042000aa-transformer-h30291","title":"OEM Payne Transformer 40VA 120V\/24V for PA3ZNB042000AA","description":"\u003ch1\u003eOEM Payne 40VA Control Transformer for Model PA3ZNB042000AA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified control transformer for the \u003cstrong\u003ePayne PA3ZNB042000AA\u003c\/strong\u003e packaged air conditioner. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, contactor coil, and all low-voltage control wiring. When the transformer fails, the entire control circuit goes dead — your thermostat loses power, the system stops responding, and no heating or cooling occurs. If your system is completely unresponsive and a blown control fuse doesn't explain it, a failed transformer is the next suspect.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01BD209 | Factory-matched output tolerance for reliable control circuit operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine OEM Payne transformer built to exact factory specifications. Generic transformers often use undersized windings and lower-grade cores that run hot, trip on overload, and fail prematurely — especially in high-demand multi-stage systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all low-voltage wires before disconnecting. Verify 24V output at secondary terminals after installation before restoring full power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the \u003cstrong\u003ePayne PA3ZNB042000AA\u003c\/strong\u003e packaged unit. Always verify the OEM part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e against your unit's data plate or existing transformer label before ordering. Our parts specialists are available to confirm fitment — order with confidence and get your system back online fast.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908879176051,"sku":"PAYNE-PA3ZNB042000AA-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908879208819,"sku":"PAYNE-PA3ZNB042000AA-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_6e984219-a166-447e-835b-dc9b73d73c98.jpg?v=1780719000","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa3znb042000aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}