OEM Carrier 40VA Control Transformer for Model FA4ANF024010AFAA Air Handler

This is the OEM factory-replacement control transformer (Part# HT01CN236) for the Carrier FA4ANF024010AFAA fan coil air handler. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and any zone controls. When this component fails, the entire control system goes dark: the thermostat loses power, the system refuses to respond to any call for heating or cooling, and in some cases a blown fuse or tripped breaker on the secondary side is the only clue. Replacing the transformer is one of the most reliable fixes when no 24V signal is present at the air handler.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Factory OEM part number HT01CN236 | Direct drop-in replacement with matching mounting footprint
• OEM vs Generic: This OEM transformer is wound to Carrier's exact VA and impedance specifications. Generic alternatives often run under-rated VA, causing nuisance burnouts when multiple accessories (humidifiers, UV lights, zone boards) share the 24V circuit.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Verify 0V at primary terminals before disconnecting leads. Label wires before removal and match wire colors on reinstallation.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Designed for the Carrier FA4ANF024010AFAA fan coil air handler. Always verify your unit's data plate voltage and VA rating before ordering — some configurations may use a different VA class. If you're unsure of fitment, our HVAC parts specialists can confirm compatibility before you order. In stock and ready to ship today.