{"product_id":"payne-pa2pnb042000aa-transformer-h30291","title":"OEM Payne Transformer 40VA 120V→24V for PA2PNB042000AA","description":"\u003ch1\u003eOEM Payne Control Transformer 40VA 120V\/24V for Model PA2PNB042000AA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified step-down transformer for the \u003cstrong\u003ePayne PA2PNB042000AA\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 it fails, nothing works: the thermostat goes dark, the system won't respond to any call for cooling or heating, and you may find a blown 3A or 5A fuse on the control board as a secondary symptom.\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 | Matches factory wiring harness and mounting footprint exactly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by the Payne control board. Undersized or off-tolerance generic units can cause erratic control behavior, nuisance tripping, or repeat fuse failures — costing far more in diagnostic time than the price difference.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and confirm voltage is off with a multimeter before beginning. Tools needed: flathead and Phillips screwdriver, wire stripper, multimeter. Label or photograph all wiring connections before removing the old transformer. Typical job time: 20–30 minutes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Payne \u003cstrong\u003ePA2PNB042000AA\u003c\/strong\u003e split-system condenser. Always verify primary and secondary voltage ratings on your unit's data plate before ordering. If you're unsure of fitment, our HVAC parts team is available to confirm compatibility before you buy — no guesswork required.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908922823027,"sku":"PAYNE-PA2PNB042000AA-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908922855795,"sku":"PAYNE-PA2PNB042000AA-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_3e54008e-808b-4445-ba0f-f7ac1a2dc9cb.jpg?v=1780719041","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa2pnb042000aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}