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This OEM replacement transformer (part# HT01BD209) is the factory-specified control circuit transformer for the Payne PA3PNA060000AA packaged air conditioner. The transformer steps down 120V line voltage to the 24V signal voltage required by your thermostat, contactor coil, and all control board logic. When this component fails, the entire control circuit loses power — the thermostat goes blank, the system won't respond to any call for heating or cooling, and nothing turns on. It is one of the first components to check when diagnosing a completely unresponsive system.
Compatibility: Designed for the Payne PA3PNA060000AA 5-ton packaged air conditioner. Confirm your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Our parts specialists are available to verify fitment prior to purchase — same-day shipping available on all in-stock orders.