OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3PPA048115NA

This OEM Carrier control transformer (part number HT01BD209) is the factory-specified replacement for the Carrier PY3PPA048115NA packaged unit. The transformer steps down high-voltage line power (208/240V) to the safe 24V required by the unit's low-voltage control circuit. When it fails, the entire control system loses power — the thermostat goes dark, the system won't respond to any commands, and you may hear a faint buzz or hum at the transformer itself. Replacing this part restores full control circuit operation and brings the system back online.

• Specs: 40VA capacity | 208/240V primary | 24V secondary | 50/60Hz | Class 2 control transformer | Factory-matched for PY3PPA048115NA
• OEM vs Generic: This genuine OEM part is wound to exact Carrier factory tolerances, ensuring stable 24V output under full load. Generic transformers may sag under load or run hotter, risking premature failure of downstream control boards and thermostats.
• Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Photograph all wiring connections before removal. Verify 24V output with a multimeter after installation before restoring the system to full operation.
• Warranty & Shipping: 1-year OEM factory warranty against manufacturing defects. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3PPA048115NA packaged unit. Also replaces superseded Carrier part numbers HT01BD207, HT01CN232, and 9076-00. Always verify the voltage rating on your unit's data plate before ordering — some configurations may use a 460V primary transformer instead. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order.