{"product_id":"carrier-py3gpaa42090aa-transformer-h30291","title":"OEM Carrier Transformer 40VA 208\/240V–24V for PY3GPAA42090AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V for Model PY3GPAA42090AA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3GPAA42090AA\u003c\/strong\u003e HVAC system. The transformer steps down line voltage from 208\/240V to the 24V signal used by your thermostat, control board, and all low-voltage components. When it fails, the entire control circuit goes dark — no thermostat response, no fan, no heat or cool — making it one of the first components to check during a no-call diagnostic.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/240V Primary | 24V Secondary | 40VA Capacity | 50\/60Hz | OEM Part # HT01BD209 | Replaces HT01BD207, HT01CN232, 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 factory VA and voltage tolerances. Undersized or off-spec aftermarket transformers can sag under load, causing intermittent resets, nuisance tripped breakers, or premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the breaker and disconnect the furnace disconnect before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Label all wires before disconnecting. Confirm secondary output reads ~24–28VAC under load after installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the \u003cstrong\u003eCarrier PY3GPAA42090AA\u003c\/strong\u003e HVAC system. Also cross-references HT01BD207, HT01CN232, and 9076-00. Always verify primary voltage (208V or 240V) on your unit's data plate before ordering. Not sure if it fits? Contact our parts team — we verify fitment before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640438051187,"sku":"CARRIE-PY3GPAA42090AA-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640438083955,"sku":"CARRIE-PY3GPAA42090AA-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_ee01527d-aeb5-4471-85b7-6e30ed6d6a06.jpg?v=1782942381","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gpaa42090aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}