OEM Carrier 40VA Control Transformer 208/240V to 24V — HT01BD209 for Model PY3GNAA24060AA

This is the OEM factory-specified control transformer for the Carrier PY3GNAA24060AA HVAC system. The transformer steps down high-voltage line power (208/240V) to the 24V low-voltage signal used by your thermostat, control board, and every relay in the system. When this component fails, the entire control circuit goes dark — you'll see a blank thermostat, no response to heat or cool calls, and a completely unresponsive system despite line voltage being present at the unit.

• Specs: Input (Primary) Voltage: 208/240V | Output (Secondary) Voltage: 24V | Frequency: 50/60 Hz | Power Rating: 40VA | OEM Part Number: HT01BD209
• OEM vs Generic: This is the genuine Carrier OEM transformer, wound to exact factory VA and voltage tolerances. Generic transformers are often rated at loose tolerances that can underpower control boards or burn out prematurely under sustained load.
• Install Difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph and label all wiring harness connections before removal. Verify 24V output with a multimeter after installation before restoring full power.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY3GNAA24060AA. Always verify your unit's data plate input voltage (208V or 240V) matches this transformer's primary tap before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today and get your system back online fast.