{"product_id":"carrier-ph13nr042000aeaa-transformer-h4oyjb","title":"OEM Carrier Control Transformer 120V–24V 40VA for PH13NR042000AEAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 120V–24V 40VA for Model PH13NR042000AEAA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PH13NR042000AEAA\u003c\/strong\u003e heat pump system. Its job is simple but mission-critical: step down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuits. When this transformer fails, the entire control system goes dark — the thermostat goes blank, the unit will not respond to calls for heating or cooling, and no contactors or relays will energize. If you're reading 0V at the R and C terminals on your thermostat, a failed transformer is one of the first components to suspect.\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 | Factory-matched windings and mounting footprint for direct drop-in replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound to Carrier's exact VA tolerance, ensuring the control board and thermostat receive a stable, clean 24V signal. Undersized or off-spec generic transformers can cause nuisance lockouts, erratic thermostat behavior, and premature contactor coil burnout.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Verify 0V at primary terminals before touching wiring. Photograph all connections before removal.\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 Engineered as a direct OEM replacement for the \u003cstrong\u003eCarrier PH13NR042000AEAA\u003c\/strong\u003e heat pump. Always confirm primary\/secondary voltage and VA rating on your unit's data plate before ordering. Our HVAC parts specialists are available to verify fitment — order with confidence.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641865851251,"sku":"CARRIE-PH13NR042000AEAA-TRANSFORMER-HT01AW229","price":37.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641865884019,"sku":"CARRIE-PH13NR042000AEAA-TRANSFORMER-HT01AW229-GEN","price":33.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01AW229_ea5f6d76-3b64-436e-af6f-35e3d41f4e9b.jpg?v=1775025359","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph13nr042000aeaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}