OEM Carrier Control Transformer 40VA 208/230V to 24V — HT01BD209 for Model PY3PNA060115AA

This genuine OEM control transformer is the factory-specified replacement for the Carrier PY3PNA060115AA packaged unit. The transformer steps down line voltage (208/230V) to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching circuits. When this part fails, the entire control circuit goes dark — you'll see a completely unresponsive thermostat, no fan, no heat, and no cooling, even though line power is present at the unit.

• Specs: 40VA rating | 208/230V primary input | 24V secondary output | 50/60 Hz | Part No. HT01BD209 | Replaces HT01BD207, HT01CN232, 9076-00
• OEM vs Generic: OEM transformers are wound to exact VA and impedance tolerances for your Carrier unit. Undersized or off-spec generic transformers can overheat, trip thermal cutoffs, and introduce voltage sag that confuses control boards and causes nuisance lockouts.
• Install difficulty: 2/5 — Disconnect all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wires before removing the old transformer. Confirm 24V output with a multimeter before buttoning up the panel.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM fit for Carrier model PY3PNA060115AA. This transformer also serves as a verified replacement for systems previously using HT01BD207, HT01CN232, or 9076-00. Always confirm line voltage on your unit's data plate matches the 208/230V primary before ordering. Have a fitment question? Our HVAC parts specialists verify compatibility before you buy — reach out before placing your order.