OEM Carrier Control Transformer 40VA 208/230V to 24V for Model PY3PNA030060AB

This genuine OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3PNA030060AB HVAC system. The transformer steps down 208/230V line voltage to the 24V required by your thermostat, control board, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dark — the thermostat loses power, the system won't respond to any calls for heating or cooling, and no low-voltage components operate. It is often the first part to diagnose when absolutely nothing responds.

• Specs: 208/230V primary input | 24V secondary output | 40VA rated | 50/60Hz | Replaces HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: This is a genuine Carrier OEM part, manufactured to exact factory VA and impedance tolerances. Generic transformers rated at nominal 40VA frequently fall short under load, causing nuisance tripped breakers and erratic board behavior.
• Install difficulty: 2/5 — Disconnect power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, needle-nose pliers. Label all wiring connections before removal. Confirm 24V output with a meter before reassembling the panel.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY3PNA030060AB. Also cross-compatible with Bryant and Payne units sharing the same transformer specification. Always verify voltage and VA rating on the original part's label before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork required.