{"product_id":"carrier-ph1pnb048000aaaa-transformer-h3025m","title":"OEM Carrier Transformer 75VA 208\/240\/480V–24V for PH1PNB048000AAAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 75VA 208\/240\/480V to 24VAC — HT01BD242 for Model PH1PNB048000AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement control transformer for the \u003cstrong\u003eCarrier PH1PNB048000AAAA\u003c\/strong\u003e packaged heat pump unit. The transformer steps high-line voltage (208, 240, or 480V primary) down to the 24VAC signal voltage required to power the entire low-voltage control circuit — including the thermostat, contactor coils, relay boards, and safety switches. When this transformer fails, the entire system goes dark: no thermostat response, no staging, no call-for-heat or cool — nothing works. A failed transformer is often caused by a shorted control wire, a faulty component drawing excess current, or simple end-of-life degradation. Always diagnose and clear the root cause before installing the replacement.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 75VA power rating | Primary input: 208 \/ 240 \/ 480VAC | Secondary output: 24VAC | Frequency: 50\/60Hz | Foot-mount configuration | OEM Part Number: HT01BD242\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine Carrier factory part, wound to exact VA and voltage tolerances. Generic transformers frequently run undersized on VA capacity, causing thermal overload trips under peak control-circuit demand and premature failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Requires shutting off all power at the disconnect and breaker before any work. Tools needed: multimeter (verify primary voltage and confirm 24VAC output after install), wire stripper, screwdrivers, needle-nose pliers. Always check for shorted low-voltage wiring before energizing — a dead short will blow the new transformer immediately.\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 NationalHVACParts.com warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for Carrier model \u003cstrong\u003ePH1PNB048000AAAA\u003c\/strong\u003e packaged heat pump units. The 75VA rating and multi-tap primary (208\/240\/480V) make this transformer applicable across a wide range of Carrier, Bryant, Payne, and ICP family packaged and split-system equipment — always verify the OEM part number on your existing transformer before ordering. Questions about fitment? Our HVAC parts specialists confirm compatibility before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641572086131,"sku":"CARRIE-PH1PNB048000AAAA-TRANSFORMER-HT01BD242","price":70.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641572118899,"sku":"CARRIE-PH1PNB048000AAAA-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_e7a7a240-fea8-4793-be56-956a5d7f56cb.jpg?v=1782943222","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph1pnb048000aaaa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}