{"product_id":"carrier-py3gna048090nb-transformer-h30291","title":"OEM Carrier 40VA Transformer HT01BD209 for PY3GNA048090NB","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD209 for Model PY3GNA048090NB\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3GNA048090NB\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When it fails, the system goes completely unresponsive: no thermostat display, no contactor pull-in, and often a blown 3A or 5A fuse on the control board. Replacing this part with the correct OEM unit restores stable 24V output and protects downstream components from voltage fluctuation.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Primary voltage 120V | Secondary voltage 24V | 40VA rating | Factory-matched impedance and thermal cutoff | OEM Part# \u003cstrong\u003eHT01BD209\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer meets Carrier's exact VA rating and winding tolerances. Undersized or off-brand transformers can sag under load, causing intermittent lockouts, nuisance tripping, or premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box and verify voltage is absent before servicing. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade connectors, multimeter to confirm 24V output after installation. Photograph all wiring before disconnecting.\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 Designed for the Carrier \u003cstrong\u003ePY3GNA048090NB\u003c\/strong\u003e packaged unit. Always verify part number HT01BD209 against your unit's wiring diagram or data plate before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork required. Order now for same-day shipping.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640474161523,"sku":"CARRIE-PY3GNA048090NB-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640474194291,"sku":"CARRIE-PY3GNA048090NB-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_757b3b36-1e30-41c8-9d23-91eb01eedb0e.jpg?v=1775016618","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gna048090nb-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}