OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY4GPAA42060AA

This genuine OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY4GPAA42060AA packaged unit. The transformer steps down 208/240V line voltage to a stable 24V output that powers the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control circuit goes dark: the thermostat becomes unresponsive, the system won't call for heating or cooling, and nothing happens when you adjust the setpoint.

• Specs: 208/240V Primary | 24V Secondary | 40VA rating | 50/60Hz | Part # HT01BD209 | Replaces HT01BD207, HT01CN232, 9076-00
• OEM vs Generic: OEM transformers are wound to exact factory VA and voltage tolerances, ensuring the control board and contactor coils receive clean, stable 24V power. Generic units can run low under load, causing nuisance lockouts and premature control board failure.
• Install difficulty: 2/5 — Always shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdriver, multimeter, wire nuts or quick-connect terminals. Photograph all wiring connections before disconnecting leads. Verify primary voltage at your unit's data plate before ordering.
• Warranty: 1-year OEM factory warranty against defects. In-stock — ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY4GPAA42060AA packaged unit. This transformer is also cross-referenced to replace OEM part numbers HT01BD207, HT01CN232, and 9076-00. Always confirm the primary voltage and VA rating on your unit's data plate before ordering. Have questions about fitment? Our HVAC parts team verifies compatibility before you buy — contact us today and get your system back up fast.