{"product_id":"payne-pa3znb030000aa-transformer-h30291","title":"OEM Payne Control Transformer 40VA 120\/24V for PA3ZNB030000AA","description":"\u003ch1\u003eOEM Payne Control Transformer 40VA 120V\/24V for Model PA3ZNB030000AA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003ePayne PA3ZNB030000AA\u003c\/strong\u003e air conditioner. The transformer steps down 120V line voltage to 24V to power the control circuit, including the thermostat, contactor coil, and control board. When the transformer fails, the entire control circuit goes dark — your thermostat becomes unresponsive, the system won't call for cooling or heating, and nothing happens when you adjust the setpoint. A blown transformer is often caused by a shorted wire, a failed contactor coil, or a wiring error during a previous service call.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V | Secondary: 24V | OEM part number HT01BD209 | Factory-matched output for reliable low-voltage control circuit operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine OEM transformer engineered to Payne's exact VA rating and insulation class. Generic transformers often underrate their true VA capacity, causing premature thermal cutout trips and repeat failures under normal system load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Label and photograph all wiring connections before disconnecting the old transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the \u003cstrong\u003ePayne PA3ZNB030000AA\u003c\/strong\u003e split-system unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork, no return hassle.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908883108211,"sku":"PAYNE-PA3ZNB030000AA-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908883140979,"sku":"PAYNE-PA3ZNB030000AA-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_271beaa1-e8e8-4f90-9f42-2b02a9f2a50a.jpg?v=1780718132","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa3znb030000aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}