{"product_id":"payne-pa3zna049000aa-transformer-h30291","title":"OEM Payne 40VA Transformer 120V-24V for PA3ZNA049000AA — HT01BD209","description":"\u003ch1\u003eOEM Payne 40VA Control Transformer for Model PA3ZNA049000AA (Part# HT01BD209)\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer is the factory-specified replacement for the \u003cstrong\u003ePayne PA3ZNA049000AA\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, absolutely nothing in the control system responds: the thermostat goes blank, the system won't call for heating or cooling, and you may detect a burning smell or a blown 3A control fuse nearby. Replacing it with the correct OEM unit restores proper 24V output and protects downstream components from voltage irregularities caused by an undersized or mismatched aftermarket part.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Replaces OEM part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e | Factory-matched output tolerance for stable low-voltage control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer meets Payne's exact VA rating and insulation class. Generic transformers frequently under-deliver under load, causing erratic thermostat behavior, nuisance lockouts, and premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify zero voltage before proceeding. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or quick-connect terminals. Always confirm primary and secondary wiring polarity before energizing.\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 for the Payne \u003cstrong\u003ePA3ZNA049000AA\u003c\/strong\u003e packaged unit. Cross-reference OEM part number HT01BD209 against your unit's wiring diagram and data plate to confirm 120V\/24V 40VA specification before ordering. Our fitment team is available to verify compatibility prior to purchase — order with confidence and get your system back online fast.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908885008755,"sku":"PAYNE-PA3ZNA049000AA-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908885041523,"sku":"PAYNE-PA3ZNA049000AA-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_da007c73-e9f9-46a9-b98f-07549085ff0a.jpg?v=1780716998","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa3zna049000aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}