{"product_id":"carrier-py3ppa030040ab-transformer-h30291","title":"OEM Carrier Transformer 120V–24V 40VA for PY3PPA030040AB","description":"\u003ch1\u003eOEM Carrier Control Transformer 120V–24V 40VA for Model PY3PPA030040AB\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-replacement control transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier PY3PPA030040AB\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage required to power the thermostat, control board, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dark — the thermostat becomes unresponsive, contactors won't energize, and the system will not heat or cool regardless of thermostat input. A failed transformer is one of the first components to check when a system shows zero response to any thermostat command.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input 120V AC | Output 24V AC | 40VA rated | OEM part number HT01BD209 | Factory-matched windings and insulation class for Carrier specifications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM transformer wound to exact factory VA and voltage tolerances. Generic aftermarket transformers often run under-rated VA, which can cause nuisance tripping of the internal thermal overload or premature failure under peak control-circuit demand.\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 beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all low-voltage wiring before disconnecting. Verify output voltage with a multimeter after installation before restoring control-circuit connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. 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 and factory-specified for the Carrier \u003cstrong\u003ePY3PPA030040AB\u003c\/strong\u003e packaged unit. Always verify your unit's data plate voltage and VA requirements before ordering. Our parts specialists are available to confirm fitment — contact us before you order if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640369828211,"sku":"CARRIE-PY3PPA030040AB-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640369860979,"sku":"CARRIE-PY3PPA030040AB-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_553e3d5d-28de-4fa8-a7d3-73b8a1d7a454.jpg?v=1775041080","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3ppa030040ab-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}