{"product_id":"carrier-py1pnb036090aaaa-transformer-h30291","title":"OEM Carrier Transformer 40VA 208\/240V–24V for PY1PNB036090AAAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V — Model PY1PNB036090AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified control transformer for the \u003cstrong\u003eCarrier PY1PNB036090AAAA\u003c\/strong\u003e packaged unit. Its job is to step down the high-voltage line power (208\/240V) to the 24V low-voltage signal used by your thermostat, control board, and every relay and valve in the system. When this transformer fails, the entire control circuit goes dark — the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and contactors will not energize. A blown transformer is also often a symptom of a downstream short, so always check for wiring faults before installing a replacement.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input 208\/240V AC | Output 24V AC | 40VA power rating | 50\/60 Hz | Direct OEM factory replacement for part number HT01BD209\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and potted to Carrier's exact VA tolerance. Undersized or off-tolerance aftermarket units can overheat quickly when driving multiple 24V loads simultaneously, leading to repeat failures.\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 proceeding. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Always confirm input voltage matches your unit's data plate. Check for shorts on the 24V secondary before energizing.\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 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits Carrier model \u003cstrong\u003ePY1PNB036090AAAA\u003c\/strong\u003e packaged unit. Verify your data plate lists a 208\/240V primary input and 24V secondary before ordering. Cross-reference OEM part number HT01BD209. Our team is available to confirm fitment — reach out before you order if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640904438131,"sku":"CARRIE-PY1PNB036090AAAA-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640904470899,"sku":"CARRIE-PY1PNB036090AAAA-TRANSFORMER-HT01BD209-GEN","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-HT01BD209_508eac3f-1d5d-473c-a1db-56fda427f125.jpg?v=1782942261","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py1pnb036090aaaa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}