OEM Payne 40VA Control Transformer for Model PA3PNA030000AB

This OEM replacement transformer (part number HT01BD209) is the factory-specified control transformer for the Payne PA3PNA030000AB air conditioner. The transformer steps down 120V line voltage to the 24V signal voltage required to power the thermostat, contactor coil, and all low-voltage control circuits throughout the system. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the contactor won't energize, and nothing in the system responds. If your Payne unit is completely unresponsive despite having line power, a failed transformer is one of the first components to test.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD209 | Factory-matched output for reliable control circuit operation
• OEM vs Generic: This OEM transformer is wound and tested to Payne's exact factory specifications. Generic transformers may use thinner wire gauge or lower-grade cores, increasing the risk of voltage sag under load — which can cause erratic thermostat behavior and nuisance lockouts.
• Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all wiring connections before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Payne PA3PNA030000AB split-system air conditioner. Verify your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — ships same day when ordered before 3PM.