{"product_id":"payne-pa3znb024000aa-transformer-h30291","title":"OEM Payne Transformer 40VA 120V\/24V for PA3ZNB024000AA","description":"\u003ch1\u003eOEM Payne Control Transformer 40VA for Model PA3ZNB024000AA\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM replacement transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) for the \u003cstrong\u003ePayne PA3ZNB024000AA\u003c\/strong\u003e air conditioner. The transformer steps down 120V line voltage to the 24V signal that powers your thermostat, contactor coil, and all control board logic. When it fails — whether from a wiring short, age, or voltage spike — the entire control circuit goes dark: the thermostat shows no power, the system will not call for cooling or heating, and no safety safeties can operate. Replacing the transformer is typically the first diagnostic step when the system is completely unresponsive despite normal line voltage at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD209 | Factory-matched output tolerance for reliable low-voltage signaling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound and tested to Payne\/ICP factory specifications. Generic transformers often run low on secondary output voltage under load, causing erratic thermostat behavior, contactor chatter, and nuisance lockouts that are difficult to diagnose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all low-voltage wires before disconnecting. Verify 24V output at secondary terminals with a multimeter after install before restoring full power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. 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 as a direct OEM replacement for \u003cstrong\u003ePayne PA3ZNB024000AA\u003c\/strong\u003e. Always confirm the 40VA rating and 120V\/24V primary-to-secondary configuration against your unit's wiring diagram or data plate before ordering. Our parts specialists are available to verify fitment — order with confidence and get your system back online today.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908884582771,"sku":"PAYNE-PA3ZNB024000AA-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908884615539,"sku":"PAYNE-PA3ZNB024000AA-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_9f12450a-ef8e-4eaf-b2d8-36a116f5aa72.jpg?v=1780718993","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa3znb024000aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}