OEM Carrier Control Transformer 40VA 208/230V–24V for Model PY3GNA048115NB

This is the genuine OEM Carrier control transformer (part number HT01BD209), factory-specified for the Carrier PY3GNA048115NB packaged unit. The control transformer steps high-voltage line power (208/230V primary) down to the 24V secondary signal that energizes your control board, thermostat, contactor coils, and relay circuits. When this transformer fails, the entire low-voltage control circuit goes dead — nothing operates, no thermostat response, no fan, no heat or cooling. A failed transformer is often misdiagnosed as a bad control board, making correct identification and prompt replacement critical.

• Specs: 208/230V primary input | 24V secondary output | 40VA power rating | 50/60 Hz | Replaces HT01BD207, HT01CN232, 9076-00
• OEM vs Generic: This factory-authorized OEM transformer is wound to exact Carrier tolerances. Generic aftermarket units frequently under-deliver on VA capacity, causing nuisance tripping of the control circuit fuse and shortening the life of downstream low-voltage components.
• Install difficulty: 2/5 — Shut off all power at the breaker and disconnect switch before starting. Tools needed: flathead and Phillips screwdrivers, wire strippers, multimeter. Photograph all existing wiring before disconnecting. Verify primary and secondary voltages with a multimeter after installation before closing the cabinet.
• Warranty: 1-year OEM factory warranty against manufacturing defects. In stock and ships same business day from our warehouse.

Compatibility: Engineered as the factory-fit replacement for the Carrier PY3GNA048115NB packaged unit. Verify your unit's data plate voltage against the 208/230V primary requirement before ordering. Our team is available to confirm fitment — order with confidence and get your system back online today.