OEM Carrier 40VA Control Transformer 208/230V–24V for Model PF1MNC031000AAAA

This OEM Carrier transformer (part #HT01CN241) is the factory-specified 24V control circuit transformer for the Carrier PF1MNC031000AAAA fan coil unit. The transformer steps down the 208/230V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching functions. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to calls for heating or cooling, and no relays will energize. Replacing it with the correct OEM unit restores proper system communication instantly.

• Specs: 208/230V primary | 24V secondary | 40VA rated | Factory-matched to Carrier PF1MNC031000AAAA specifications
• OEM vs Generic: This OEM transformer meets exact Carrier factory tolerances for output voltage stability and VA capacity. Undersized or off-brand transformers can sag under load, causing erratic thermostat behavior, nuisance lockouts, and premature control board failures.
• Install difficulty: 2/5 — Always disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all wiring connections before removal and match wire-for-wire on reinstallation.
• Warranty: 1-year OEM manufacturer warranty included. In-stock units ship same business day from our warehouse.

Compatibility: Designed for the Carrier PF1MNC031000AAAA fan coil unit. Confirm your unit's data plate shows a 208/230V primary and 24V, 40VA secondary requirement before ordering. Our fitment team is available to verify compatibility — contact us before you order if you have any questions.