{"product_id":"carrier-ph13nr03000gajaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V→24V for PH13NR03000GAJAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model PH13NR03000GAJAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier PH13NR03000GAJAA\u003c\/strong\u003e heat pump system. Its job is to step down line voltage (120V) to the 24V AC signal that powers your thermostat, contactor coil, and all low-voltage control components. When this transformer fails, the entire control circuit goes dark — the thermostat loses power, the system won't respond to any calls for heating or cooling, and you may measure 0V at the R and C terminals on your control board. Using the exact OEM part ensures the transformer meets factory VA rating tolerances and fits the original mounting footprint without modification.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01AW229 | Factory-matched form and fit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine Carrier OEM transformer, wound to exact factory VA and voltage specifications. Generic transformers can run under-rated VA, causing coil overheating, nuisance tripping, and premature failure of downstream low-voltage components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: Phillips and flathead screwdrivers, nut driver, multimeter. Label all low-voltage wires before disconnecting. Verify 24V output at secondary terminals before reassembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. 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 as the factory replacement for \u003cstrong\u003eCarrier model PH13NR03000GAJAA\u003c\/strong\u003e. Confirm your existing transformer's primary\/secondary voltage and VA rating on the unit data plate before ordering to ensure proper fitment. Our HVAC parts specialists are available to verify compatibility before you buy — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641874370931,"sku":"CARRIE-PH13NR03000GAJAA-TRANSFORMER-HT01AW229","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641874403699,"sku":"CARRIE-PH13NR03000GAJAA-TRANSFORMER-HT01AW229-GEN","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01AW229_5c0025e8-d236-488b-b5a0-7b8e0ea3fe89.jpg?v=1775041461","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph13nr03000gajaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}