{"product_id":"carrier-pf1mnb030005aaaa-transformer-h3hwwy","title":"OEM Carrier 40VA Transformer HT01CN241 for PF1MNB030005AAAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01CN241 for Model PF1MNB030005AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PF1MNB030005AAAA\u003c\/strong\u003e fan coil unit. The transformer steps down 120V line voltage to the 24V signal voltage required by the control board, thermostat, and all low-voltage safety circuits. When this component fails, the entire low-voltage control circuit goes dead — the thermostat goes blank, the system ignores all calls for heating or cooling, and no contactors or relays energize. Replacing a faulty transformer is one of the most cost-effective repairs on any air handler or fan coil.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 120V primary | 24V secondary | 40VA rating | Factory-matched output tolerance | Terminal or lead-wire connections\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and potted to Carrier's exact VA rating and insulation class. Generic units are often underrated in VA, causing thermal cutout trips under full load and premature failure of the low-voltage circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always switch off power at the breaker and verify zero voltage with a multimeter before disconnecting leads. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all wires before removal and confirm polarity on reinstall.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory 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 OEM fit for \u003cstrong\u003eCarrier PF1MNB030005AAAA\u003c\/strong\u003e fan coil units. Always verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating against your unit's data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before your order ships — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62643344540019,"sku":"CARRIE-PF1MNB030005AAAA-TRANSFORMER-HT01CN241","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62643344572787,"sku":"CARRIE-PF1MNB030005AAAA-TRANSFORMER-HT01CN241-GEN","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01CN241_cb1979c9-4ed1-4b73-8bcd-9d15d8517cdb.jpg?v=1775016653","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pf1mnb030005aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}