{"product_id":"carrier-pf1mnb018000aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 208\/230V 40VA 24V for PF1MNB018000AAAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 208\/230V 40VA for Model PF1MNB018000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part #HT01CN241) is the factory-specified 40VA step-down transformer for the \u003cstrong\u003eCarrier PF1MNB018000AAAA\u003c\/strong\u003e fan coil and air handler series. Its primary job is to step line voltage down from 208\/230V to a safe 24V AC, powering the thermostat signal wiring, control board, and all low-voltage switching in the system. When the transformer fails, nothing in the control circuit works — the thermostat goes dark, contactors don't energize, and the system produces no heating or cooling response whatsoever.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/230V Primary | 24V Secondary | 40VA Power Rating | Direct OEM drop-in 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 tolerance specs. Undersized or off-tolerance aftermarket transformers can overheat, blow fuses, or damage control boards — stick with OEM for a part this critical.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Always shut off power at the breaker and verify zero voltage with a multimeter before touching wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all 24V secondary wires before disconnecting the old unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as the direct OEM replacement for \u003cstrong\u003eCarrier model PF1MNB018000AAAA\u003c\/strong\u003e fan coil and air handler units. Verify your unit's data plate shows a 208\/230V primary and 24V secondary requirement before ordering. Our fitment team is available to confirm compatibility — reach out before you order if you're unsure.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62643346375027,"sku":"CARRIE-PF1MNB018000AAAA-TRANSFORMER-HT01CN241","price":108.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62643346407795,"sku":"CARRIE-PF1MNB018000AAAA-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_06bc53d4-2490-42d3-9618-0e94bcfa36b1.jpg?v=1775041129","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pf1mnb018000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}