OEM Carrier Control Transformer 40VA 208/230V — HT01BD209 for Model PY3PNA048115AA

This genuine OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3PNA048115AA packaged unit. The transformer steps down 208/230V line voltage to the 24V signal required by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When it fails, the entire control circuit goes dark — you'll see a blank thermostat, hear no contactor pull-in, or find the system completely unresponsive to any call for heating or cooling.

• Specs: 40VA rating | 208/230V primary input | 24V secondary output | 50/60 Hz | Replaces HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact VA and voltage tolerances. Undersized or off-spec aftermarket units can starve the 24V circuit under load, causing nuisance lockouts and premature contactor coil failure.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter (verify 0V before touching terminals), wire nuts or spade connectors. Photograph existing wiring before removal. Confirm primary voltage matches your supply.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Directly fits Carrier PY3PNA048115AA packaged units. Cross-references OEM part numbers HT01BD207, HT01CN232, and 9076-00. Always verify your unit's data plate voltage and VA requirements before ordering. Need fitment confirmation? Our HVAC parts team will verify compatibility before your order ships — contact us today.