{"product_id":"carrier-pf1mnc042000aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 24V Control Circuit for PF1MNC042000AAAA","description":"\u003ch1\u003eOEM Carrier 24V Control Circuit Transformer HT01CN241 for Model PF1MNC042000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer is the factory-specified replacement for the \u003cstrong\u003eCarrier PF1MNC042000AAAA\u003c\/strong\u003e fan coil unit. Its sole but critical job is to convert 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage relay coils throughout the system. When this transformer fails, \u003cstrong\u003enothing works\u003c\/strong\u003e — the thermostat goes dark, the contactor coil loses its signal, and the entire unit becomes unresponsive. It is one of the first components any technician checks on a completely dead system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Primary voltage: 120V AC | Secondary voltage: 24V AC | OEM Part Number: HT01CN241 | Factory-matched VA rating for Carrier PF1MNC042000AAAA low-voltage control circuit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA specifications, protecting sensitive control boards from under-voltage brown-outs and over-current surges that off-brand units commonly cause. Using the OEM part preserves your control board warranty.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Power down and lock out the unit before any work. Tools needed: flathead and Phillips screwdriver, multimeter (verify 0V before touching secondary leads), wire nuts or push-in connectors. Photograph all wiring before disconnecting. Test secondary voltage output before re-energizing the full system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed before cut-off ship same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed and factory-matched for \u003cstrong\u003eCarrier model PF1MNC042000AAAA\u003c\/strong\u003e fan coil units. Always verify primary\/secondary voltage and VA rating on your existing transformer's data label before ordering to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you buy — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62643336151411,"sku":"CARRIE-PF1MNC042000AAAA-TRANSFORMER-HT01CN241","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62643336184179,"sku":"CARRIE-PF1MNC042000AAAA-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_ad6b9b96-93d0-4c39-b720-6dd094b0f69c.jpg?v=1775041213","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pf1mnc042000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}