{"product_id":"carrier-ph3zpa036000aa-transformer-h3025m","title":"OEM Carrier Transformer 75VA 208\/240\/480V–24V for PH3ZPA036000AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 75VA 208\/240\/480V to 24VAC for Model PH3ZPA036000AA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part #HT01BD242) is the factory-specified replacement for the \u003cstrong\u003eCarrier PH3ZPA036000AA\u003c\/strong\u003e packaged heat pump unit. The transformer steps down high-voltage power (208\/240\/480V primary) to the 24VAC low-voltage signal that drives your thermostat, contactor coils, gas valve, and all control circuit components. When this transformer fails, the result is typically a completely unresponsive system — no thermostat display response, no contactor pull-in, and no staging commands reaching any component. A failed transformer is often misdiagnosed as a bad control board, making correct identification critical before replacing costlier parts.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 75VA power rating | 208\/240\/480V multi-tap primary input | 24VAC secondary output | 50\/60Hz rated | 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 OEM transformer wound and tested to factory tolerances. Generic aftermarket transformers frequently under-deliver on VA capacity under load, causing nuisance tripping of downstream low-voltage fuses and intermittent control lockouts — especially in multi-stage systems with higher 24V current draws.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Shut off all power at the disconnect and verify zero voltage before touching any terminals. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 24VAC output after install). Always label and photograph all low-voltage wiring connections before removing the old transformer. Check and replace the low-voltage fuse (typically 3A) if the original transformer burned out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock units ship same business day when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as the direct OEM replacement for \u003cstrong\u003eCarrier model PH3ZPA036000AA\u003c\/strong\u003e. The multi-tap 208\/240\/480V primary makes this transformer suitable across commercial and residential voltage configurations. Always confirm your unit's primary voltage tap requirement on the data plate before wiring. Have a question about fitment? Our HVAC parts specialists verify compatibility before you order — reach out before checkout.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641322656115,"sku":"CARRIE-PH3ZPA036000AA-TRANSFORMER-HT01BD242","price":70.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641322688883,"sku":"CARRIE-PH3ZPA036000AA-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_98638221-cb52-4e1a-9217-3ff8664f8caa.jpg?v=1782943309","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph3zpa036000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}