{"product_id":"carrier-pf4mnb025000aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 208\/230V 40VA for PF4MNB025000AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 208\/230V Primary 24V Secondary 40VA for Model PF4MNB025000AAAA\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM replacement transformer (part #HT01CN241) factory-specified for the \u003cstrong\u003eCarrier PF4MNB025000AAAA\u003c\/strong\u003e fan coil and air handler. The transformer steps down line voltage (208\/230V primary) to 24V AC on the secondary, powering the entire 24V control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, you'll typically see a completely dead control system: the thermostat goes blank, the system won't respond to any command, or a fuse blows repeatedly on the secondary side. A failed transformer is often misdiagnosed as a bad thermostat or control board — always test transformer output voltage first before replacing more expensive components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/230V Primary | 24V Secondary | 40VA Rating | Direct OEM drop-in replacement | Part #HT01CN241\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage-regulation tolerances. Undersized or off-tolerance aftermarket units can cause nuisance fuse trips, erratic thermostat behavior, and premature control board failure — the OEM unit eliminates that risk entirely.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Always shut off the disconnect and verify zero voltage with a meter before touching any wiring. Label all wire connections before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Most techs complete the swap in under 20 minutes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse when ordered by 5PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Factory-specified for the Carrier \u003cstrong\u003ePF4MNB025000AAAA\u003c\/strong\u003e fan coil\/air handler. Always verify your unit's wiring diagram and confirm 208\/230V primary voltage at the transformer location before ordering. Need help confirming fitment? Our HVAC parts specialists are standing by — order with confidence and get your system back up fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62643271139699,"sku":"CARRIE-PF4MNB025000AAAA-TRANSFORMER-HT01CN241","price":108.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62643271172467,"sku":"CARRIE-PF4MNB025000AAAA-TRANSFORMER-HT01CN241-GEN","price":95.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01CN241_4b49cee1-fcb0-40fd-87a2-f194f973b046.jpg?v=1775041144","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pf4mnb025000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}