OEM Carrier 40VA Control Transformer 208/230V–24V for Model PF4MNB037T00AAAA

This is the genuine OEM Carrier replacement transformer (part number HT01CN241), factory-specified for the Carrier PF4MNB037T00AAAA fan coil and air handler units. The transformer steps down 208/230V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactors, relays, and control board. When this transformer fails, the entire control circuit goes dark: the thermostat display may go blank, the system won't respond to calls for heating or cooling, and no low-voltage components will energize.

• Specs: 208/230V primary voltage | 24V secondary voltage | 40VA power rating | Basler Electric model BE28316007 | Direct OEM drop-in replacement
• OEM vs Generic: OEM transformers are wound and encapsulated to Carrier's exact factory specifications, ensuring proper VA headroom and stable 24V output under full control-circuit load. Generic units often run undersized VA ratings, causing voltage sag that leads to erratic relay chatter, nuisance lockouts, and premature board failures.
• Install difficulty: 2/5 — Always shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Verify 24V output at secondary terminals before reassembly. Photograph all wiring connections before disconnecting.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse.

Compatibility: Directly replaces the factory-installed transformer in the Carrier PF4MNB037T00AAAA fan coil unit. Also used across multiple Carrier air handler and fan coil platforms — confirm your unit's data plate shows 208/230V primary and 24V/40VA secondary before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy.