{"product_id":"payne-pa4zna030000aa-transformer-h30291","title":"OEM Payne Transformer 40VA 120V\/24V for PA4ZNA030000AA — HT01BD209","description":"\u003ch1\u003eOEM Payne Control Transformer 40VA 120V\/24V for Model PA4ZNA030000AA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement control transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) for the \u003cstrong\u003ePayne PA4ZNA030000AA\u003c\/strong\u003e air conditioner. The transformer steps down 120V line voltage to the 24V signal that powers your thermostat, contactor coil, and all low-voltage control circuits. When this component fails, the entire control circuit loses power — your thermostat goes blank, the system stops responding to calls for cooling, and no diagnostic codes are generated because the board itself has no power to run. A failed transformer is often mistaken for a bad thermostat or control board, making it one of the most important first checks during a no-power service call.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD209 | Factory-matched for Payne PA4ZNA030000AA control circuit requirements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound and rated to exact factory specifications, ensuring proper VA capacity and voltage stability under peak demand. Undersized generic transformers can overheat, blow fuses, or cause erratic thermostat behavior — especially when multiple accessories share the 24V circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections before disconnecting. Verify primary and secondary voltages with a meter after installation before restoring full system power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed and factory-specified for the Payne \u003cstrong\u003ePA4ZNA030000AA\u003c\/strong\u003e split-system air conditioner. Confirm your existing transformer's VA rating and primary\/secondary voltages against your unit's data plate before ordering. Our fitment team is available to verify compatibility before you buy — no guesswork required. Order now and enjoy same-day shipping on all in-stock OEM parts.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908353085811,"sku":"PAYNE-PA4ZNA030000AA-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908353118579,"sku":"PAYNE-PA4ZNA030000AA-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_fad7f92c-1e66-4f46-be48-529f3d0b4b54.jpg?v=1780719032","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa4zna030000aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}