{"product_id":"payne-pa3ppa042000ab-transformer-h30291","title":"OEM Payne Transformer 40VA 120V\/24V for PA3PPA042000AB — HT01BD209","description":"\u003ch1\u003eOEM Payne 40VA Control Transformer for Model PA3PPA042000AB — Part HT01BD209\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) for the \u003cstrong\u003ePayne PA3PPA042000AB\u003c\/strong\u003e air conditioner. The transformer steps down line voltage (120V) to the 24V signal that powers your thermostat, contactor coil, and all low-voltage control circuits. When it fails, the entire control system goes dark — the thermostat goes blank, the system won't respond to any call for cooling or heating, and no components energize. A failed transformer is often misdiagnosed as a bad thermostat or control board, making correct identification critical before replacing expensive parts.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary input | 24V secondary output | Factory-matched OEM part number HT01BD209 | Designed for Payne PA3PPA042000AB split-system applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This factory OEM transformer is wound to exact VA and voltage specifications for the PA3PPA042000AB. Generic replacements may under-deliver on VA capacity, causing nuisance tripping of the control fuse or premature contactor coil failure under sustained load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify voltage is absent before proceeding. Tools needed: flathead and Phillips screwdrivers, wire nuts or terminal connectors, multimeter to confirm 24V output after installation. Label all low-voltage wiring before disconnecting.\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 stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Payne \u003cstrong\u003ePA3PPA042000AB\u003c\/strong\u003e split-system condenser. Always confirm the transformer's VA rating and primary\/secondary voltages match your unit's data plate before ordering. Our fitment team is available to verify compatibility before you buy — in stock and ready to ship today.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908896838003,"sku":"PAYNE-PA3PPA042000AB-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908896870771,"sku":"PAYNE-PA3PPA042000AB-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_afaf22a3-cc6f-4212-8f49-d60debe9f90f.jpg?v=1780718983","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa3ppa042000ab-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}