OEM Carrier Transformer 40VA 120V to 24V for Model FA4CNC036010AAAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FA4CNC036010AAAA air handler. Its job is to step down the 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage switching functions. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any call for heating or cooling, and no contactors or relays will energize. If you're getting 120V at the primary and nothing at the secondary, this is your part.

• Specs: 40VA rated | 120V primary / 24V secondary | OEM part number HT01CN241 | Factory-matched output for Carrier FA4CNC036010AAAA air handler control circuits
• OEM vs Generic: OEM transformers are wound and insulated to exact factory VA ratings, ensuring stable 24V output under full control-circuit load. Generic units can sag under load, causing nuisance lockouts, thermostat brownouts, and premature control board failure.
• Install Difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Verify 0V at primary terminals before touching wiring. Photograph all wire connections before disconnecting. Match primary and secondary wire leads carefully on reinstall.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse.

Compatibility: Designed for the Carrier FA4CNC036010AAAA fan coil air handler. Always verify your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — no guesswork required. Order today and ship today.