{"product_id":"payne-pa4gnxa48000aa-transformer-h30291","title":"OEM Payne Transformer 40VA 120V-24V for PA4GNXA48000AA","description":"\u003ch1\u003eOEM Payne 40VA Control Transformer for Model PA4GNXA48000AA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part# \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified step-down transformer for the \u003cstrong\u003ePayne PA4GNXA48000AA\u003c\/strong\u003e split-system air conditioner. The transformer converts 120V line voltage to the 24V AC signal that powers the entire control circuit — including the thermostat, contactor coil, and control board. When this component fails, the system goes completely silent: the thermostat goes blank, the contactor won't energize, and no heating or cooling cycle can begin. A failed transformer is one of the most commonly misdiagnosed HVAC faults, often mistaken for a bad control board or thermostat.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD209 | Factory-matched to Payne PA4GNXA48000AA control circuit requirements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit meets exact VA rating and insulation class specifications. Undersized or off-brand transformers can overheat, blow the 3A control fuse repeatedly, or cause erratic thermostat behavior — problems that disappear when the correct OEM part is installed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Check for a blown 3A control fuse on the board before replacing — a shorted zone valve or contactor coil will immediately burn a new transformer if the fault isn't cleared first.\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 for the Payne \u003cstrong\u003ePA4GNXA48000AA\u003c\/strong\u003e 4-ton split-system condenser. Verify your unit's control voltage and VA requirement on the data plate or wiring diagram before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before your order ships — no guesswork required.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908861874547,"sku":"PAYNE-PA4GNXA48000AA-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908861907315,"sku":"PAYNE-PA4GNXA48000AA-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_093b9874-4bc1-4e71-a9ea-a98f4495eabe.jpg?v=1780718891","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa4gnxa48000aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}