{"product_id":"carrier-ph10ja042000aaaa-transformer-h4oyjb","title":"OEM Carrier Control Transformer 60VA 115\/208\/230V for PH10JA042000AAAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 60VA 115\/208\/230V–24V for Model PH10JA042000AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement control transformer for the \u003cstrong\u003eCarrier PH10JA042000AAAA\u003c\/strong\u003e packaged heat pump unit. The transformer steps down line voltage (115, 208, or 230V primary) to a safe 24V AC secondary signal that powers the entire low-voltage control circuit — including the thermostat, contactor coil, reversing valve solenoid, and control board. When this transformer fails, the result is complete loss of 24V power: the thermostat goes blank, the system is completely unresponsive, and no heating or cooling function is possible. A failed transformer may also blow the low-voltage fuse repeatedly if there is a secondary-circuit short present.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 60 VA power rating | 115\/208\/230 VAC primary (multi-tap) | 24 VAC secondary | 50\/60 Hz | Foot-mount configuration | OEM Part Number HT01AW229 \/ HT01AW229A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier Factory Authorized Part — not an aftermarket substitute. OEM transformers are wound to exact VA and voltage tolerance specifications, protecting downstream control boards and contactors from under\/over-voltage damage that generic units can cause.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Always disconnect all power (line voltage AND 24V circuit) before servicing. Tools needed: multimeter (verify 0V before touching terminals), flathead and Phillips screwdrivers, wire stripper, and needle-nose pliers. Photograph all wiring connections before removal. Verify primary tap matches your supply voltage (115V, 208V, or 230V) before energizing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer 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 Engineered as a direct drop-in replacement for \u003cstrong\u003eCarrier model PH10JA042000AAAA\u003c\/strong\u003e packaged heat pump units. Cross-references include HT01AW229A. Verify your existing transformer's VA rating and primary voltage tap before ordering to ensure a proper match. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you purchase — reach out today and we'll ship it out fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641993679219,"sku":"CARRIE-PH10JA042000AAAA-TRANSFORMER-HT01AW229","price":162.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641993711987,"sku":"CARRIE-PH10JA042000AAAA-TRANSFORMER-HT01AW229-GEN","price":142.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01AW229_004c6d8a-6245-4471-89b1-d9863015fb77.jpg?v=1775025908","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph10ja042000aaaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}