{"product_id":"carrier-pf4mnb031l00abaa-transformer-h3hwwy","title":"OEM Carrier Control Transformer 40VA 208\/230V–24V — PF4MNB031L00ABAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/230V to 24V for Model PF4MNB031L00ABAA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier control transformer (part #HT01CN241) is the factory-specified replacement for the \u003cstrong\u003eCarrier PF4MNB031L00ABAA\u003c\/strong\u003e fan coil unit. The transformer steps down the 208\/230V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactors, and control board. When this transformer fails, the system loses all 24V control signal: the thermostat goes dark, no calls for heating or cooling are processed, and the unit is completely unresponsive despite line power being present.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/230V Primary | 24V Secondary | 40VA Capacity | OEM Part #HT01CN241 | Factory-matched to Carrier electrical tolerances\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound and rated to exact Carrier factory specifications, ensuring the correct VA headroom for all control loads on the PF4MNB031L00ABAA. Undersized or off-spec generic transformers frequently overheat, trip thermal protection, or fail prematurely under combined relay and board loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all low-voltage wiring before disconnecting. Replacement is straightforward — the transformer mounts to a chassis bracket with two screws and uses push-on or screw terminals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for Carrier model \u003cstrong\u003ePF4MNB031L00ABAA\u003c\/strong\u003e fan coil units. Verify primary voltage tap on your unit's data plate (208V or 230V) before ordering — both taps are supported by this transformer. Questions about fitment? Our HVAC parts specialists verify compatibility before you order — contact us today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62643266978163,"sku":"CARRIE-PF4MNB031L00ABAA-TRANSFORMER-HT01CN241","price":108.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62643267010931,"sku":"CARRIE-PF4MNB031L00ABAA-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_5cc1ac11-6479-4a3d-9e54-0f65ebcca779.jpg?v=1775025536","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pf4mnb031l00abaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}