OEM Carrier 40VA Control Transformer 208/230V–24V for Model PF4MNA018L00AAAA

This is the genuine OEM Carrier replacement transformer (part number HT01CN241) engineered specifically for the Carrier PF4MNA018L00AAAA air handler. The transformer steps down line voltage from 208/230V on the primary side to a safe 24V on the secondary side, powering the low-voltage control circuit that governs your thermostat, zone valves, and system switching. When this transformer fails, the entire control circuit goes dark — symptoms include a completely unresponsive thermostat, no fan, and no heating or cooling response despite power being present at the unit.

• Specs: 208/230V Primary | 24V Secondary | 40VA rated | OEM part number HT01CN241 | Direct factory-matched replacement
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part, built to exact voltage and VA tolerances. Generic transformers often run outside rated VA capacity, risking control board damage and nuisance tripping of secondary fusing.
• Install difficulty: 2/5 — Shut off all power to the air handler before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all low-voltage wiring before disconnecting terminals.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse when ordered by 3 PM local time.

Compatibility: Designed for the Carrier PF4MNA018L00AAAA fan coil / air handler. Also used across Carrier, Bryant, ICP, Heil, and Tempstar platforms sharing this transformer specification. Always verify your existing transformer's primary voltage, secondary voltage, and VA rating against your unit's data plate before ordering. Our fitment team is available to confirm compatibility — just reach out before you order.