{"product_id":"carrier-py2ppb048090ab-transformer-h30291","title":"OEM Carrier Transformer 40VA 208\/240V–24V for PY2PPB048090AB","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer 208\/240V to 24V — HT01BD209 for Model PY2PPB048090AB\u003c\/h1\u003e\u003cp\u003eThe \u003cstrong\u003eCarrier HT01BD209\u003c\/strong\u003e is the factory-specified 40VA control transformer for the \u003cstrong\u003ePY2PPB048090AB\u003c\/strong\u003e packaged gas\/electric unit. Its job is straightforward but absolutely critical: it steps down the 208\/240V line voltage to the 24V signal voltage that powers every low-voltage control in the system — thermostat, contactor coil, gas valve, and control board. When this transformer fails, the entire control circuit goes dead. You'll see a completely unresponsive thermostat, no fan operation, no heating, and no cooling — as if the system has no power at all. A blown secondary fuse on the control board is often the first clue that the transformer has shorted.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input (primary) voltage: 208\/240V AC | Output (secondary) voltage: 24V AC | Power rating: 40VA | Frequency: 50\/60 Hz | OEM part number: HT01BD209\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This factory OEM transformer is wound to exact Carrier tolerances, ensuring stable 24V output under full VA load. Off-brand substitutes frequently deliver fluctuating secondary voltage that causes nuisance lockouts, erratic thermostat behavior, and premature control board failure.\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, wire stripper, multimeter. Photograph all low-voltage wiring connections before removal. Check for the short that burned out the original transformer before energizing the new part.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for \u003cstrong\u003eCarrier model PY2PPB048090AB\u003c\/strong\u003e packaged units. Verify your unit's data plate shows a 208\/240V primary and 24V secondary control circuit before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — order with confidence and get back up and running today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640508535155,"sku":"CARRIE-PY2PPB048090AB-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640508567923,"sku":"CARRIE-PY2PPB048090AB-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_b6df7cba-a05f-464e-9d9e-54fc51edcb2c.jpg?v=1782942326","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py2ppb048090ab-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}