OEM Carrier Control Transformer 40VA 120V/24V for Model FB4CNP018L05ACAA

This OEM Carrier control transformer (part# HT01CN241) is the factory-specified replacement for the Carrier FB4CNP018L05ACAA fan coil air handler. The transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, nothing in the system responds: the thermostat goes dark, the air handler won't energize, and no heating or cooling cycle can initiate. A failed transformer is often misdiagnosed as a thermostat or control board issue, making correct identification critical before replacing more expensive components.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN241 | Factory-matched output tolerance for stable low-voltage circuit operation
• OEM vs Generic: This OEM transformer is wound and rated to Carrier's exact factory specifications. Generic transformers may carry inconsistent VA ratings or lower-grade core materials, risking under-voltage conditions that cause erratic control board behavior or premature component failure.
• Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: Phillips and flathead screwdrivers, multimeter (to confirm 0V before touching terminals), wire nuts or spade connectors. Verify primary and secondary voltages with your meter after installation before restoring the system to service.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before 3PM local time.

Compatibility: Designed specifically for the Carrier FB4CNP018L05ACAA fan coil air handler. Confirm your existing transformer's VA rating and voltage markings on the unit data plate prior to ordering to ensure a direct fit. Our parts specialists are available to verify fitment — reach out before you order if you have any questions. Order today and your part ships the same business day.