{"product_id":"carrier-py3ppa048115nb-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 208\/230V–24V — PY3PPA048115NB","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/230V–24V for Model PY3PPA048115NB\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM Carrier control transformer (part #HT01BD209) factory-specified for the \u003cstrong\u003eCarrier PY3PPA048115NB\u003c\/strong\u003e packaged unit. The transformer steps down 208\/230V line voltage to the 24V low-voltage signal that powers your thermostat, control board, contactor coil, and every other safety circuit in the system. When this transformer fails — whether from a shorted control wire, a failed component drawing excess current, or simple age — the entire low-voltage circuit goes dead. Symptoms include a completely unresponsive thermostat, a system that won't energize in any mode, or a blown low-voltage fuse that keeps returning.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA capacity | 208\/230V primary input | 24V secondary output | 50\/60 Hz | OEM part #HT01BD209 | Also cross-references HT01BD207, HT01CN232, 4000A46E07AE28, and 9076-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to Carrier's exact VA and impedance ratings. Undersized or off-tolerance generic units can overheat, trip thermal protection, or fail to hold 24V under load — causing intermittent lockouts that are extremely difficult to diagnose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always shut off 120V power at the disconnect before working in the control compartment. Tools needed: flathead and Phillips screwdriver, multimeter, wire labels. Before disconnecting, photograph all wiring. Inspect all low-voltage wiring for shorts that may have caused the original failure — replacing the transformer without fixing the root cause will blow the new one too.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as the factory replacement for Carrier model \u003cstrong\u003ePY3PPA048115NB\u003c\/strong\u003e packaged gas\/electric units. Verify your unit's data plate shows 208\/230V single-phase power and 24V control circuit before ordering. Questions about fitment? Our team confirms compatibility before you buy — no guessing required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640350888307,"sku":"CARRIE-PY3PPA048115NB-TRANSFORMER-HT01BD209","price":50.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640350921075,"sku":"CARRIE-PY3PPA048115NB-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_41177f0a-59cc-4448-8bcd-412db8363568.jpg?v=1775025554","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3ppa048115nb-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}