OEM Carrier Control Transformer 40VA 208/240V to 24V — HT01BD209 for Model PY1PJB048115NBAA

This is the factory OEM replacement control transformer for the Carrier PY1PJB048115NBAA packaged unit. The transformer steps down the 208/240V line voltage to the 24V signal required to power the thermostat, control board, and all low-voltage switching circuits. When this transformer fails — due to a shorted control wire, water intrusion, or age — nothing in the system responds: the thermostat goes blank, the unit won't energize, and no call for heating or cooling is processed. Replacing this transformer with the correct OEM part restores full low-voltage control circuit integrity.

• Specs: Input (Primary) Voltage: 208/240V | Output (Secondary) Voltage: 24V | Power Rating: 40VA | Frequency: 50/60 Hz | OEM Part Number: HT01BD209
• OEM vs Generic: OEM transformers are wound to exact VA capacity and insulation class for your unit. Generic transformers often use thinner windings and lower-grade core material, increasing the risk of early burnout — especially if a minor wiring fault causes momentary overload.
• Install Difficulty: 2/5 — Always shut off power at the disconnect before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wires before disconnecting. Check for shorted thermostat wiring before installing the new transformer, or the replacement may fail immediately.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY1PJB048115NBAA packaged unit. Verify your existing transformer's primary voltage, secondary voltage, and VA rating against your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — order with confidence and get your system back online today.