{"product_id":"carrier-pf4mna043000aaaa-transformer-h3hwwy","title":"OEM Carrier 24V Control 40VA Transformer for PF4MNA043000AAAA Fan Coil","description":"\u003cdiv class=\"product-content\"\u003e\n\u003ch1\u003eOEM Carrier 24V Control Transformer for PF4MNA043000AAAA Fan Coil\u003c\/h1\u003e\n\u003cp\u003eThe control transformer supplies the 24V low-voltage power that runs every control on your Carrier PF4MNA043000AAAA fan coil — the thermostat, the blower relay, and the control board itself. It converts the 208\/240V line voltage down to a safe, regulated 24V. When the transformer fails, the symptoms are unmistakable: the thermostat display goes blank, the unit ignores every call for heating or cooling, and the blower stays silent no matter what you set. A failing transformer may also hum, run hot to the touch, or blow the board fuse over and over.\n\nThis is a genuine Carrier Class II 40VA control transformer with a dual 208\/240V primary and a 24V secondary, wound to OEM specifications so it delivers full rated VA without sagging under the combined relay and board load.\n\nOEM matters because a cheap aftermarket transformer with a lower VA rating or thinner windings overheats under load and drops its output voltage below the 24V threshold the board's relays need to engage — causing intermittent, hard-to-diagnose failures before the part dies completely. A genuine Carrier transformer holds spec and protects the components downstream of it.\n\nInstall difficulty: 2 of 5. Tools needed: 1\/4\" and 5\/16\" nut drivers, a multimeter to verify 24V on the secondary, and wire nuts. #1 safety warning: KILL THE BREAKER to the fan coil before touching anything — the primary leads carry lethal line voltage. Confirm 0V at the primary with your meter before disconnecting wires.\n\nShips same business day from our stocked warehouse on orders placed before 3 PM CST. Backed by a 1-year OEM warranty and 30-day hassle-free returns on uninstalled parts.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis part is compatible with Carrier model PF4MNA043000AAAA. Always verify the part number against your unit's data plate before ordering.\u003c\/p\u003e\n\u003ch2\u003eWhy Choose OEM?\u003c\/h2\u003e\n\u003cp\u003eOEM parts are manufactured to the exact factory specifications for your unit. Generic aftermarket alternatives may fit physically but often use lower-rated components that reduce equipment life and void manufacturer warranties. When the cost difference between OEM and generic is $10-30, the OEM part is always the smarter investment on a system worth $5,000-$15,000.\u003c\/p\u003e\n\u003ch2\u003eShipping \u0026amp; Returns\u003c\/h2\u003e\n\u003cp\u003eSame-day shipping on orders before 3 PM CST. Standard delivery 2-5 business days, express options available at checkout. 30-day hassle-free returns on uninstalled parts — free return shipping included. 1-year OEM factory warranty coverage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62643290833267,"sku":"CARRIE-PF4MNA043000AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62643290866035,"sku":"CARRIE-PF4MNA043000AAAA-TRANSFORMER-HT01CN241-GEN","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-HT01CN241_6cf372c7-c97f-476a-838c-776beeaa7dfa.jpg?v=1782898048","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pf4mna043000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}