{"product_id":"carrier-pf4mnb049000aaaa-transformer-h3hwwy","title":"OEM Carrier Control Transformer 40VA 208\/230V — PF4MNB049000AAAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/230V→24V for Model PF4MNB049000AAAA\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM Carrier control transformer (part #HT01CN241) factory-specified for the \u003cstrong\u003eCarrier PF4MNB049000AAAA\u003c\/strong\u003e fan coil and air handler. The transformer steps down line voltage (208\/230V primary) to the 24V AC signal that powers your thermostat, control board, and all low-voltage components. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and no low-voltage components operate. In some cases a failed transformer will trip a fuse or breaker on the secondary circuit, which is a telltale sign this part needs replacement.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/230V Primary | 24V Secondary | 40VA Rating | OEM Part #HT01CN241 | Factory-matched to Carrier PF4MNB049000AAAA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e Genuine Carrier OEM transformers are wound to exact VA and voltage tolerances. Undersized or off-spec aftermarket units can brown out control boards, cause erratic thermostat behavior, or fail prematurely under full control-circuit load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the breaker before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label all low-voltage wires before disconnecting. Verify fuse on secondary side is intact after replacement.\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 cutoff time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as a direct OEM replacement for the \u003cstrong\u003eCarrier PF4MNB049000AAAA\u003c\/strong\u003e fan coil\/air handler unit. Confirm your unit's data plate lists a 208\/230V primary and 24V\/40VA secondary before ordering. Need fitment verification? Our HVAC parts specialists confirm compatibility before your order ships — no guesswork, no returns.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62643259375987,"sku":"CARRIE-PF4MNB049000AAAA-TRANSFORMER-HT01CN241","price":107.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62643259408755,"sku":"CARRIE-PF4MNB049000AAAA-TRANSFORMER-HT01CN241-GEN","price":94.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01CN241_c97fd7d0-a3b0-4aa3-ad1d-40bde21bd650.jpg?v=1775025461","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pf4mnb049000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}