{"product_id":"carrier-pf4mnb031000aaaa-transformer-h3hwwy","title":"OEM Carrier 40VA Transformer 208\/230V–24V for PF4MNB031000AAAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer 208\/230V–24V for Model PF4MNB031000AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier PF4MNB031000AAAA\u003c\/strong\u003e fan coil and air handler unit. The control transformer steps down the 208\/230V line voltage to a safe 24V signal used to power the thermostat circuit, control board, and all low-voltage switching components. When this transformer fails, the entire control circuit goes dead — the thermostat display may go blank, the system will not respond to calls for heating or cooling, and no safety lockouts will function. Replacing a failed transformer is one of the most cost-effective repairs in HVAC service.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 208\/230V primary input | 24V secondary output | 50\/60Hz | Direct OEM drop-in replacement for Carrier PF4MNB031000AAAA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is manufactured to exact Carrier factory specifications, ensuring correct VA capacity and winding insulation class. Undersized or off-spec generic transformers can overheat, blow the control fuse repeatedly, or fail prematurely under full 24V load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Confirm secondary output voltage (24V AC) with a meter before powering the full system. Photograph all wiring connections before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty. In-stock units ship same business day when ordered by 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for the Carrier model \u003cstrong\u003ePF4MNB031000AAAA\u003c\/strong\u003e fan coil\/air handler. Always verify the 208\/230V primary and 24V secondary 40VA rating against your unit's data plate before ordering. Need help confirming fitment? Our HVAC parts specialists are standing by — contact us before you order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62643268190579,"sku":"CARRIE-PF4MNB031000AAAA-TRANSFORMER-HT01CN241","price":103.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62643268223347,"sku":"CARRIE-PF4MNB031000AAAA-TRANSFORMER-HT01CN241-GEN","price":91.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01CN241_1bcf0a50-cbcc-4a6e-9f6a-d8c82488fbc8.jpg?v=1775016420","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pf4mnb031000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}