{"product_id":"carrier-ph3zna036000aa-transformer-h3025m","title":"OEM Carrier Control Transformer 120V–24V 40VA for PH3ZNA036000AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 120V–24V 40VA for Model PH3ZNA036000AA\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-specified control transformer (part number \u003cstrong\u003eHT01BD242\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier PH3ZNA036000AA\u003c\/strong\u003e packaged heating unit. The control transformer steps down line voltage (120V primary) to 24V AC for the low-voltage control circuit — powering the thermostat, contactor coil, gas valve, and all safety switches. When the transformer fails, \u003cem\u003enothing in the control system responds\u003c\/em\u003e: the thermostat goes dark, the system won't call for heat or cooling, and the contactor won't energize. It is one of the first components to check when a unit goes completely dead despite normal line voltage at the disconnect.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 120V primary | 24V secondary | 40VA rated | OEM part number HT01BD242 | Factory-matched for Carrier packaged unit control circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the exact OEM unit sourced from Carrier. OEM transformers are wound and insulated to factory specifications, ensuring correct VA output and long-term thermal stability under continuous cycling — generic units often run underrated VA, causing premature thermal cutout trips.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Turn off all power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, multimeter (verify 24V output after install), wire nuts or push-in connectors. Label or photograph all low-voltage wiring before disconnecting the old transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In-stock units ship same business day from our warehouse when ordered before 3PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as a direct OEM replacement for the \u003cstrong\u003eCarrier PH3ZNA036000AA\u003c\/strong\u003e 3-ton packaged heating unit. Always verify your unit's data plate confirms 120V\/24V transformer specifications before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment at no charge — reach out before you order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641342611827,"sku":"CARRIE-PH3ZNA036000AA-TRANSFORMER-HT01BD242","price":37.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641342644595,"sku":"CARRIE-PH3ZNA036000AA-TRANSFORMER-HT01BD242-GEN","price":33.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD242_9b55ef4c-dd69-4993-affe-10104efbfafb.jpg?v=1775025361","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph3zna036000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}