OEM Carrier Transformer 40VA 120V/24V for Model FA4ANF024010AGAA

This OEM replacement transformer (part number HT01CN236) is the factory-specified step-down transformer for the Carrier FA4ANF024010AGAA air handler. The transformer converts 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuits. When this component fails, nothing in the system responds — the thermostat goes dark, the air handler won't call for heating or cooling, and the control board receives no power. It is one of the most overlooked root causes of a completely unresponsive HVAC system.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN236 | Factory-matched for Carrier FA4ANF024010AGAA air handlers
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by the Carrier control board. Undersized or off-tolerance generic units can cause nuisance tripping, control board brownouts, and premature contactor coil failure.
• Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire nuts or spade connectors, multimeter to verify 24V output after installation. Label or photograph all wiring connections before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship the same business day from our stocked warehouse.

Compatibility: Designed specifically for the Carrier FA4ANF024010AGAA air handler. Verify your existing transformer's VA rating and primary/secondary voltages on the data plate inside the air handler cabinet before ordering. If you're unsure of fitment, our parts team can confirm compatibility before you purchase — just reach out before placing your order.