OEM Carrier Transformer 40VA 120V/24V for Model FC4DNF036008AAAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FC4DNF036008AAAA fan coil unit. Its job is to step down line voltage (120V) 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 will not respond to any calls for heating or cooling, and you may detect a burned or charred smell near the air handler cabinet.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 transformer | Direct OEM replacement for Carrier part number HT01CN241 | Mounts to factory bracket location
• OEM vs Generic: This is a genuine OEM Carrier transformer wound to exact factory VA and voltage tolerances. Generic transformers are often underrated, causing thermal overload failures within one season — especially in systems with multiple low-voltage accessories such as zone boards or humidifiers.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Verify output voltage at secondary terminals (should read 24–26V AC) before reassembling. Photograph all wiring connections prior to removal.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FC4DNF036008AAAA fan coil unit. Always confirm your existing transformer's VA rating, primary voltage, and secondary voltage against your unit's data plate before ordering. Our parts specialists are available to verify fitment — just ask before you buy. Order today and take advantage of same-day shipping on all in-stock OEM Carrier parts.