OEM Carrier Control Transformer 40VA 208/230V–24V for Model PF4MNA018T00AAAA

This OEM Carrier transformer (part #HT01CN241) is the factory-specified 40VA control transformer for the Carrier PF4MNA018T00AAAA fan coil / air handler. Its sole job is to step down 208/230V line voltage to a safe 24V AC signal that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When this transformer fails, the entire control circuit goes dark — the thermostat goes blank, the system won't respond to calls for heating or cooling, and no low-voltage components will operate at all.

• Specs: 208/230V Primary | 24V Secondary | 40VA Power Rating | Direct OEM replacement for Carrier part #HT01CN241
• OEM vs Generic: OEM transformers are wound and potted to exact Carrier factory tolerances, ensuring a stable 24V output under full load. Generic units frequently deliver marginal voltage, causing erratic thermostat behavior, nuisance lockouts, and premature control board failure.
• Install Difficulty: 2/5 — Always shut off power at the breaker before working on the air handler. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label and photograph all wire connections before removal. The transformer typically mounts on the blower deck or control panel with two screws.
• Warranty: 1-year OEM manufacturer's warranty. In stock — ships same business day when ordered by 3 PM local time.

Compatibility: Designed as a direct OEM drop-in replacement for the Carrier PF4MNA018T00AAAA fan coil unit. This part is also used across Carrier, Bryant, and ICP-family air handlers that specify the HT01CN241 transformer. Verify your unit's data plate lists 208/230V primary input and 24V/40VA secondary before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — no guesswork required.