{"product_id":"payne-pa3ppa048000aa-transformer-h30291","title":"OEM Payne Transformer 40VA 120\/24V for PA3PPA048000AA — HT01BD209","description":"\u003ch1\u003eOEM Payne 40VA Control Transformer for Model PA3PPA048000AA — Part HT01BD209\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-replacement control transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) for the \u003cstrong\u003ePayne PA3PPA048000AA\u003c\/strong\u003e packaged air conditioning unit. The transformer steps down 120V line voltage to the 24V signal needed to power your thermostat, contactor coil, control board, and all low-voltage safety circuits. When this transformer fails, the entire control circuit goes dead — nothing responds, the thermostat goes blank, and the system will not start at all. A failed transformer is one of the most commonly misdiagnosed HVAC faults, often confused with a bad control board or thermostat.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | Factory-matched OEM tolerances | Compatible with Payne packaged unit control circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit (HT01BD209) is wound to exact factory specifications, ensuring stable 24V output under full load. Generic transformers often under-perform at rated VA, causing nuisance lockouts, intermittent contactor chatter, and shortened control board life.\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. Always verify 24V output with a multimeter after installation before closing the unit. Photograph existing wiring before disconnecting.\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 Designed specifically for the Payne \u003cstrong\u003ePA3PPA048000AA\u003c\/strong\u003e 4-ton packaged air conditioning unit. Confirm your existing transformer's VA rating and primary\/secondary voltages on the data plate inside the control compartment before ordering. Our fitment team is available to verify compatibility prior to purchase — same-day shipping available on all in-stock orders.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908896510323,"sku":"PAYNE-PA3PPA048000AA-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908896543091,"sku":"PAYNE-PA3PPA048000AA-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_71c091fd-195f-4298-a3c4-0f5e830129fe.jpg?v=1780718798","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa3ppa048000aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}