OEM Carrier Transformer 40VA 120V to 24V for Model FA4ANC030008AGAA

This is the factory OEM replacement transformer (part number HT01CN236) for the Carrier FA4ANC030008AGAA air handler. The transformer steps line voltage (120V) down to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuits. When this part fails, the entire control circuit goes dark — your thermostat goes blank, the system refuses to respond to any call for heating or cooling, and nothing works. It is often the first part to check when a system is completely unresponsive despite confirmed line power at the air handler.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 transformer | Direct OEM replacement for part number HT01CN236
• OEM vs Generic: This factory OEM unit is wound to Carrier's exact VA and voltage tolerances, ensuring stable 24V output under full control circuit load. Generic transformers may sag under load, causing intermittent lockouts, nuisance trips, or premature control board failures.
• Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after installation. Photograph all low-voltage wiring connections before disconnecting. Most experienced DIYers complete this repair in under 30 minutes.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FA4ANC030008AGAA air handler. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you purchase — same-day shipping on all in-stock orders.