{"product_id":"carrier-ph4gpaa42000aa-transformer-h3025m","title":"OEM Carrier Transformer 75VA 208\/240\/480V–24V for PH4GPAA42000AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 75VA 208\/240\/480V–24V for Model PH4GPAA42000AA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part #HT01BD242) for the \u003cstrong\u003eCarrier PH4GPAA42000AA\u003c\/strong\u003e packaged heat pump unit. The transformer steps down high-voltage primary power — 208V, 240V, or 480V — to the 24V AC signal that powers your thermostat, contactor coils, and all low-voltage control circuits. When this transformer fails, the result is total loss of control voltage: the thermostat goes blank, the system refuses to respond to calls for heating or cooling, and no components energize. Replacing it is one of the highest-impact single-part repairs you can make.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 75VA rating | Primary: 208\/240\/480V | Secondary: 24VAC | 50\/60Hz | Foot-mount configuration | OEM part #HT01BD242\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier factory-authorized part, engineered to exact VA rating and insulation class. Undersized or off-brand transformers can overheat under full control-circuit load, causing intermittent faults and shortened service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before beginning. Tools needed: multimeter (to verify 0V before touching terminals), flathead and Phillips screwdrivers, needle-nose pliers, wire labels. Always photograph existing wiring connections before disconnecting. Verify primary voltage tap matches your supply voltage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty. In-stock orders ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for the \u003cstrong\u003eCarrier PH4GPAA42000AA\u003c\/strong\u003e packaged heat pump unit. This transformer is also cross-referenced for use in compatible Carrier, Bryant, Payne, and ICP family equipment sharing the HT01BD242 specification. Confirm your unit's primary supply voltage (208V, 240V, or 480V) matches the appropriate tap before installation. Not sure it fits? Contact our parts team — we verify fitment before you order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641226023283,"sku":"CARRIE-PH4GPAA42000AA-TRANSFORMER-HT01BD242","price":70.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641226056051,"sku":"CARRIE-PH4GPAA42000AA-TRANSFORMER-HT01BD242-GEN","price":23.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-HT01BD242_ac43f116-c73e-480e-b554-3b35656cee59.jpg?v=1782943335","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph4gpaa42000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}