OEM Carrier Control Transformer 40VA 208/230V to 24V for Model PY3GPAA30060AA

This OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3GPAA30060AA packaged unit. The transformer steps down 208/230V line voltage to the 24V required by the system's low-voltage control circuit — powering the thermostat, control board, relays, and all safety logic. When this transformer fails, the entire control circuit loses power, leaving the thermostat dark and the system completely unresponsive to any call for heating or cooling.

• Specs: 208/230V Primary | 24V Secondary | 40VA capacity | 50/60 Hz rated | Direct OEM replacement for HT01BD209, supersedes HT01BD207 and HT01CN232
• OEM vs Generic: OEM transformers are wound to exact Carrier factory tolerances, ensuring steady, clean 24V output. Generic equivalents may run slightly high or low on secondary voltage, causing nuisance tripping of control boards or premature contactor failure.
• Install difficulty: 2/5 — Always shut off power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (verify 0V before touching terminals). Photograph all wire connections before disconnecting. Check for shorted low-voltage wiring before installing the new transformer — a downstream short will immediately blow the new unit.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered as the direct OEM fit for the Carrier PY3GPAA30060AA packaged unit. Also replaces superseded part numbers HT01BD207 and HT01CN232. Confirm your existing transformer's primary voltage (208/230V) and VA rating (40VA) against the data plate before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — contact us today and get your system back online fast.