{"product_id":"carrier-ph13nr042000aaaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V\/24V for PH13NR042000AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V–24V for Model PH13NR042000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part# \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PH13NR042000AAAA\u003c\/strong\u003e heat pump system. The transformer steps down 120V line voltage to the 24V AC signal that powers your entire control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the system goes completely unresponsive: the thermostat goes blank, the unit will not energize, and no error codes are displayed because there is no low-voltage power to run any diagnostics.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | Factory OEM-matched windings and insulation class | Direct plug-and-play fit for PH13NR042000AAAA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by the factory control board. Generic units often run under-rated VA, causing nuisance tripping of the 3-amp fuse and premature board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label all wires 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 and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed and factory-matched for the \u003cstrong\u003eCarrier PH13NR042000AAAA\u003c\/strong\u003e heat pump. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility before you buy — same-day shipping on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641866998131,"sku":"CARRIE-PH13NR042000AAAA-TRANSFORMER-HT01AW229","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641867030899,"sku":"CARRIE-PH13NR042000AAAA-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_b5680ff8-b1c9-4d9f-9e84-b76bcea4cffa.jpg?v=1775041344","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph13nr042000aaaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}