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This OEM Carrier transformer (part number HT01CN241) is the factory-specified 40VA step-down transformer for the Carrier PF4MNB061T00ABAA fan coil and air handler series. Its job is critical: it steps line voltage (208/230V) down to the 24V signal used by your thermostat, control board, and all low-voltage components. When this transformer fails, absolutely nothing in your control circuit responds — the thermostat goes blank, the system refuses to start, and you may blow a control-circuit fuse. Replacing it with the correct OEM unit restores full system function immediately.
Compatibility: Engineered as the direct OEM replacement for the Carrier PF4MNB061T00ABAA fan coil unit. Always verify your existing transformer's primary voltage and VA rating on the data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists confirm fitment before you buy — contact us today and we'll ship it out fast.