{"product_id":"carrier-pf4mna037000aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 208\/230V 40VA for PF4MNA037000AAAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 208\/230V 40VA — HT01CN241 for Model PF4MNA037000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PF4MNA037000AAAA\u003c\/strong\u003e fan coil\/air handler unit. The transformer steps down line voltage from \u003cstrong\u003e208\/230V primary\u003c\/strong\u003e to a safe \u003cstrong\u003e24V secondary\u003c\/strong\u003e at \u003cstrong\u003e40VA\u003c\/strong\u003e, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, nothing in the system responds: the thermostat goes blank, the blower won't energize, and no heating or cooling call is answered. It is often the first component to diagnose when a system appears completely dead despite line voltage being present at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/230V primary | 24V secondary | 40VA power rating | Direct OEM replacement for Carrier 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 tolerances required by Carrier. Undersized or off-spec generic units can cause nuisance fuse blows, control board damage, or intermittent lockouts — OEM is always the safer choice for the control circuit backbone.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph all wiring connections before disconnecting. Confirm 24V output with a multimeter after installation before reassembling the panel.\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 as a direct OEM replacement for the \u003cstrong\u003eCarrier PF4MNA037000AAAA\u003c\/strong\u003e fan coil unit. Verify your unit's data plate shows a 208\/230V primary and 24V\/40VA control circuit before ordering. Not sure? Our HVAC parts specialists verify fitment before you buy — contact us today and get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62643298304371,"sku":"CARRIE-PF4MNA037000AAAA-TRANSFORMER-HT01CN241","price":108.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62643298337139,"sku":"CARRIE-PF4MNA037000AAAA-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_1e29924e-4dec-4ee3-a585-de0e9a1a6639.jpg?v=1775041141","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pf4mna037000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}