OEM Carrier Transformer 40VA 120V/24V for Model FA4ANC018005AGAA

This OEM step-down transformer (part number HT01CN236) is the factory-specified replacement for the Carrier FA4ANC018005AGAA fan coil air handler. The transformer converts 120V line voltage to the 24V AC signal that powers the entire control circuit — including the thermostat, contactor coil, and control board. When this component fails, the result is a completely unresponsive system: the thermostat goes blank, the air handler won't respond to any call for heating or cooling, and no control-voltage components will energize. A failed transformer is often misdiagnosed as a bad control board, so always verify 24V output at the secondary terminals before replacing more expensive parts.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN236 | Compact chassis-mount design for air handler applications
• OEM vs Generic: This OEM transformer meets Carrier's exact VA rating and insulation class. Undersized or off-tolerance generic transformers can overheat under full control-circuit load, tripping the internal auto-reset breaker or failing prematurely.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or quick-connect terminals. Label all wiring before removal. Verify 24V output on secondary terminals after installation before closing the panel.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier FA4ANC018005AGAA fan coil air handler. Confirm your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Our fitment team is available to verify compatibility before you buy — same-day shipping on all in-stock orders.