{"product_id":"carrier-py1ppb030040aaaa-transformer-h30291","title":"OEM Carrier Transformer 40VA 208\/240V–24V for PY1PPB030040AAAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V — HT01BD209 for Model PY1PPB030040AAAA\u003c\/h1\u003e\u003cp\u003eThe \u003cstrong\u003eCarrier HT01BD209\u003c\/strong\u003e is the factory-specified 40VA step-down transformer for the \u003cstrong\u003ePY1PPB030040AAAA\u003c\/strong\u003e packaged unit. Its job is to convert 208\/240V line voltage down to the 24V that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When this transformer fails — due to a shorted control circuit, age, or a wiring fault — the entire control circuit goes dark: the thermostat goes blank, relays won't energize, and the unit refuses to respond to any call for heating or cooling. Replacing it with the correct OEM part restores full low-voltage power immediately.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA power rating | 208\/240V primary input | 24V secondary output | 50\/60Hz | Factory-matched to Carrier PY1PPB030040AAAA control circuit requirements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD209 is wound to exact VA and impedance specs. Generic transformers may carry the correct voltage markings but often run outside tolerance under full load, causing nuisance tripped breakers, brownouts on contactor coils, and premature control board failures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power (line and control) before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Always verify 0V at primary terminals before touching wires. Photo-document all wiring connections prior to removal. Swap primary and secondary leads in sequence, apply power, and confirm 24V output at secondary before closing the panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty. In stock and ships the same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for Carrier model \u003cstrong\u003ePY1PPB030040AAAA\u003c\/strong\u003e packaged units. Verify your existing transformer's input voltage, output voltage, and VA rating on the data plate or component label before ordering. Not sure it fits? Contact our technical team — we confirm fitment before every order ships.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640805511539,"sku":"CARRIE-PY1PPB030040AAAA-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640805544307,"sku":"CARRIE-PY1PPB030040AAAA-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_634fa6f8-6693-4cfd-bb26-f39ed06e755f.jpg?v=1782942268","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py1ppb030040aaaa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}