OEM Carrier 40VA Transformer HT01CN241 for Model FB4CNF036L10ACAA

This OEM step-down transformer (part# HT01CN241) is the factory-specified replacement for the Carrier FB4CNF036L10ACAA fan coil air handler. The transformer converts 120V line voltage to 24V AC to power the control circuit, including the thermostat, contactor coil, and control board. When the transformer fails, the entire control circuit goes dead — your thermostat will be unresponsive, the system won't call for cooling or heating, and nothing will operate despite line power being present at the unit.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Direct OEM replacement for part# HT01CN241 | Factory-matched impedance and thermal protection
• OEM vs Generic: This factory OEM transformer is wound to exact VA and voltage specifications for the FB4CNF036L10ACAA control circuit. Generic transformers often have loose VA tolerances that cause voltage sag under load, leading to erratic thermostat behavior, nuisance tripping, and premature control board failure.
• Install difficulty: 2/5 — Shut off all power to the air handler at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Confirm 0V at primary terminals before touching wiring. Note wire colors and terminal labels before disconnecting old transformer.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier FB4CNF036L10ACAA fan coil air handler. Verify your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — no guesswork, no return hassle.