{"product_id":"carrier-pf4mnb043t00aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for PF4MNB043T00AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model PF4MNB043T00AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier PF4MNB043T00AAAA\u003c\/strong\u003e air handler. Its sole but critical job is to step line voltage (120V) down to 24V to power the low-voltage control circuit — including your thermostat, zone controls, and every relay on the board. When this transformer fails, \u003cem\u003enothing\u003c\/em\u003e works: the thermostat goes dark, the system is completely unresponsive, and you may measure zero volts on the secondary side with a multimeter.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input: 120V AC | Output: 24V AC | Rating: 40VA | OEM Part Number: HT01CN241 | Factory-matched insulation class and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine Carrier OEM unit — built to exact VA and thermal cutout specifications. Generic transformers often run undersized VA ratings, causing premature burnout under normal load from thermostats and zone boards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Photograph and label all wiring connections before disconnecting the old unit. Verify 24V output on secondary terminals before closing the panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. 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 Designed and tested for the Carrier \u003cstrong\u003ePF4MNB043T00AAAA\u003c\/strong\u003e air handler. Always confirm input voltage and VA rating on your unit's data plate before ordering — mismatched VA ratings will cause repeated transformer failure. Our fitment team is available to verify compatibility before you purchase.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62643260555635,"sku":"CARRIE-PF4MNB043T00AAAA-TRANSFORMER-HT01CN241","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62643260588403,"sku":"CARRIE-PF4MNB043T00AAAA-TRANSFORMER-HT01CN241-GEN","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01CN241_18b03534-9dbb-4fa1-b5ff-7b9e90a60e7e.jpg?v=1775041264","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pf4mnb043t00aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}