{"product_id":"carrier-ph14na024000aaaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V\/24V for PH14NA024000AAAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model PH14NA024000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PH14NA024000AAAA\u003c\/strong\u003e heat pump system. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dark — your thermostat loses power, the system won't respond to any call for heating or cooling, and no relays or contactors will energize. If you're measuring 120V on the primary side but zero volts on the secondary, this transformer is the likely culprit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | Replaces OEM part \u003cstrong\u003eHT01AW229\u003c\/strong\u003e | Factory-matched insulation class and VA rating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the factory OEM unit, wound to exact VA and voltage specifications. Generic transformers can run at marginal VA ratings that cause brownouts in the control circuit, leading to random lockouts and nuisance tripping of low-voltage fuses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Always shut off power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all wiring connections before removal. Verify 24V output on the secondary with a multimeter after installation before restoring full power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for Carrier model \u003cstrong\u003ePH14NA024000AAAA\u003c\/strong\u003e heat pump systems. Verify your existing transformer's VA rating and primary\/secondary voltages against your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment prior to purchase — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641791009139,"sku":"CARRIE-PH14NA024000AAAA-TRANSFORMER-HT01AW229","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641791041907,"sku":"CARRIE-PH14NA024000AAAA-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_f380c0a3-8f61-44ba-b3c3-9c08586c3e56.jpg?v=1775041350","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph14na024000aaaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}