{"product_id":"carrier-py3gnaa42090na-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 208\/240V–24V for PY3GNAA42090NA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V for Model PY3GNAA42090NA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part #HT01BD209) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3GNAA42090NA\u003c\/strong\u003e packaged gas\/electric unit. The transformer steps down 208\/240V line voltage to the 24V signal used by your thermostat, control board, gas valve, and every other low-voltage component in the system. When it fails, the entire control circuit goes dead — the thermostat goes blank, the system will not respond to any call for heat or cooling, and you may measure zero voltage on the 24V secondary terminals.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 208\/240V primary input | 24V secondary output | 50\/60 Hz | Replaces HT01BD207, HT01CN232, and 9076-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM transformer wound to exact VA and voltage tolerances. Undersized or off-spec generic transformers can overheat, trip their internal breaker repeatedly, or damage downstream control boards — making OEM the only safe choice here.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Always verify 0V at the primary leads before touching any wiring. Label wires before removal.\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 Carrier model \u003cstrong\u003ePY3GNAA42090NA\u003c\/strong\u003e packaged units. Cross-references HT01BD207, HT01CN232, and 9076-00. Always verify primary voltage on your unit's data plate before ordering — 460V primary units require a different part number. Questions? Our HVAC parts specialists verify fitment before you order — no guesswork.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640448405875,"sku":"CARRIE-PY3GNAA42090NA-TRANSFORMER-HT01BD209","price":50.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640448438643,"sku":"CARRIE-PY3GNAA42090NA-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_9daa6fb9-f743-43a7-9c0a-83f72088ef37.jpg?v=1775025682","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gnaa42090na-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}