OEM Carrier Control Transformer 40VA 208/240V to 24V — HT01BD209 for Model PY3GNA030060AA

This is the genuine OEM Carrier control transformer (part number HT01BD209), factory-specified for the Carrier PY3GNA030060AA HVAC system. The control transformer is the backbone of your unit's 24-volt low-voltage circuit — it steps down 208/240V line voltage to the 24V signal used by the thermostat, control board, gas valve, contactor coil, and every other low-voltage component. When it fails, the entire control circuit goes dark: the thermostat goes blank, the system stops responding to calls for heating or cooling, and no safeties or sequences can operate.

• Specs: 208/240V primary input | 24V secondary output | 40VA power rating | 50/60 Hz | Compact footprint: 3.5" L × 2.2" W × 1.9" H | OEM part number HT01BD209
• OEM vs Generic: This factory-authorized OEM transformer is wound to exact Carrier tolerances, ensuring a stable 24V rail under full load. Off-brand substitutes often drift under load, causing intermittent lockouts, nuisance tripping of safeties, or premature control board failure.
• Install difficulty: 2/5 — Disconnect and lockout all power before beginning. Tools needed: multimeter (verify 0V at primary before touching wires), flathead and Phillips screwdrivers, wire nuts or spade terminals. Photograph all wiring connections before removal. Confirm primary voltage tap matches your supply voltage (208V or 240V) before energizing.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY3GNA030060AA. Also replaces superseded Carrier part numbers HT01BD207, HT01CN232, and 9076-00. Always verify your unit's supply voltage and confirm the part number on your existing transformer's label before ordering. Our fitment team is available to verify compatibility before you buy — order with confidence.