OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3GNAA60115NA

This OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3GNAA60115NA HVAC system. The transformer steps down the 208/240V line voltage to a safe 24V AC signal that powers the entire low-voltage control circuit — including the thermostat, control board, and all safety switches. When this component fails, the result is typically a completely unresponsive system: blank thermostat display, no call for heat or cooling, and no blower operation. If your system is completely dead with line voltage confirmed at the unit, a failed transformer is the first component to test.

• Specs: 40VA capacity | 208/240V primary input | 24V secondary output | 50/60Hz compatible | Replaces obsolete P/Ns HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: OEM transformers are wound to exact factory VA and voltage tolerances, ensuring stable 24V output under full control-circuit load. Undersized or off-tolerance generic transformers can cause nuisance lockouts, intermittent control failures, and premature board damage.
• Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph all low-voltage wiring connections before disconnecting. Verify 24V output at secondary terminals after installation before closing the cabinet.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Fits Carrier model PY3GNAA60115NA. Verify primary voltage (208V or 240V) against your unit's data plate before ordering. This part also cross-references to HT01BD207, HT01CN232, and 9076-00 for multi-model applicability. Have a fitment question? Our HVAC parts specialists verify compatibility before you order — reach out before placing your order.