OEM Carrier Control Transformer 40VA 120V to 24V for Model FV4ANF003000AAAA

This is the OEM factory-specified replacement transformer (part number HT01CN236) for the Carrier FV4ANF003000AAAA fan coil air handler. The transformer steps down line voltage (120V) to the 24V low-voltage signal used by the control board, thermostat, and all switching circuits. When this transformer fails, the entire control circuit loses power — the result is a completely unresponsive system: no thermostat communication, no blower response, and no heating or cooling function whatsoever.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01CN236 | Factory-matched for Carrier FV4ANF003000AAAA air handler control circuit
• OEM vs Generic: OEM transformers are wound and rated to exact factory VA specifications, protecting downstream control boards and thermostats from voltage fluctuation. Generic alternatives may run under-rated VA, causing premature burnout or nuisance tripping of the control board's fuse.
• Install difficulty: 2/5 — Shut off all power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all low-voltage wiring before disconnecting. Verify 24V output with a multimeter after installation before restoring system power.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Designed for the Carrier FV4ANF003000AAAA fan coil air handler. Confirm your existing transformer's VA rating and primary/secondary voltages on the unit's data plate or wiring diagram before ordering. If your system shows a blown fuse on the control board alongside transformer failure, inspect for a short in the low-voltage wiring before replacing. Our fitment team is available to verify compatibility before you order — reach out with your model and serial number for a confirmed match.