{"product_id":"carrier-py1ppb042090aaaa-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 208\/240V–24V — PY1PPB042090AAAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V for Model PY1PPB042090AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# HT01BD209) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY1PPB042090AAAA\u003c\/strong\u003e packaged unit. The transformer steps down 208\/240V line voltage to the 24V DC used by the thermostat, control board, contactor coil, and all low-voltage safety circuits. When it fails, the entire control circuit goes dead — the thermostat loses power, the system stops responding to calls for heating or cooling, and no components will energize. It is one of the most common root causes of a completely unresponsive HVAC system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA power rating | 208\/240V primary input | 24V secondary output | 50\/60Hz | OEM part number HT01BD209 | Factory-matched to Carrier PY1PPB042090AAAA\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 tolerances. Undersized or out-of-spec aftermarket transformers can overheat under full control-circuit load, tripping thermal protection and causing intermittent lockouts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the breaker and disconnect switch before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire nuts or terminal connectors, multimeter. Always photograph or label existing wiring before disconnecting. Verify 24V output with a multimeter after installation before reassembling the cabinet.\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\u003ePY1PPB042090AAAA\u003c\/strong\u003e packaged unit. Cross-references include HT01CN232 and HT01CN233. Verify your unit's control voltage and VA requirement on the data plate before ordering. Our team is available to confirm fitment — order with confidence and get your system back up today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640796893555,"sku":"CARRIE-PY1PPB042090AAAA-TRANSFORMER-HT01BD209","price":55.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640796926323,"sku":"CARRIE-PY1PPB042090AAAA-TRANSFORMER-HT01BD209-GEN","price":48.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_329bb76f-b4c4-481b-abca-03d1684a4072.jpg?v=1775025770","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py1ppb042090aaaa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}