{"product_id":"carrier-py3gpaa30040aa-transformer-h30291","title":"OEM Carrier Transformer 40VA 208\/230V–24V for PY3GPAA30040AA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD209 for Model PY3GPAA30040AA\u003c\/h1\u003e\u003cp\u003eThis genuine OEM Carrier transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3GPAA30040AA\u003c\/strong\u003e packaged unit. The control transformer steps down line voltage from \u003cstrong\u003e208\/230V primary\u003c\/strong\u003e to a stable \u003cstrong\u003e24V secondary output\u003c\/strong\u003e at \u003cstrong\u003e40VA\u003c\/strong\u003e, powering the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, the system goes completely unresponsive: no call-for-cooling, no call-for-heating, and no 24V signal to any downstream component. A blown fuse on the secondary side or a completely dead control board are the most common symptoms pointing directly to transformer failure.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/230V Primary | 24V Secondary | 40VA Rating | 50\/60 Hz | Factory OEM tolerance — direct plug-and-play fitment for PY3GPAA30040AA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers maintain precise secondary voltage under load fluctuations. Generic units can sag under peak draw, causing erratic control board behavior and nuisance lockouts. This is a genuine Carrier part — no guesswork on fitment or output stability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire labels or tape. Always verify 0V at terminals before touching wiring. Label all low-voltage leads before disconnecting. Test secondary output (should read ~24–28V AC) after installation before closing the panel.\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 Confirmed fit for Carrier model \u003cstrong\u003ePY3GPAA30040AA\u003c\/strong\u003e. Also replaces legacy Carrier part numbers HT01BD207, HT01CN232, and 9076-00. Verify your unit's data plate voltage before ordering — this transformer is rated for 208\/230V primary input only. Not compatible with 460V or 575V primary applications. Questions about fitment? Our HVAC parts specialists verify compatibility before you order — no returns needed.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640442081651,"sku":"CARRIE-PY3GPAA30040AA-TRANSFORMER-HT01BD209","price":50.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640442114419,"sku":"CARRIE-PY3GPAA30040AA-TRANSFORMER-HT01BD209-GEN","price":44.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_534525f0-a736-4226-b853-a09c53d68cd4.jpg?v=1775041637","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gpaa30040aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}