OEM Carrier Control Transformer 120V/24V 40VA for Model PF1MNB018010AAAA

This OEM control transformer (part number HT01CN241) is the factory-specified replacement for the Carrier PF1MNB018010AAAA fan coil unit. The transformer steps down 120V line voltage to the 24V AC signal that powers every component in the control circuit — thermostat, zone valves, relays, and the control board itself. When the transformer fails, the entire low-voltage control circuit goes dead: the thermostat goes blank, the system will not respond to any call for heating or cooling, and in some cases a failed transformer will trip repeatedly due to a short elsewhere in the 24V circuit.

• Specs: 120V primary | 24V secondary | 40VA output | Factory-matched OEM construction | Blade or screw terminal connections (verify against unit wiring diagram)
• OEM vs Generic: OEM transformers are wound and rated to exact factory specifications, ensuring proper VA capacity under full control-circuit load. Generic units are often under-rated, causing thermal cutouts to trip prematurely and shortening the life of connected components.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output and rule out a downstream short before installing the new unit). Always identify and correct any 24V short-circuit before replacing — a shorted control circuit will blow the new transformer immediately.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PF1MNB018010AAAA fan coil unit. Confirm primary voltage (120V) and VA rating (40VA) on your unit's data plate before ordering. Not sure this is the right part? Our HVAC parts specialists verify fitment before you order — contact us for fast confirmation.