OEM Payne Control Circuit Transformer 40VA for Model PA3ZNB036000AA

This is the factory OEM replacement transformer (part# HT01BD209) for the Payne PA3ZNB036000AA split-system air conditioner. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any commands, and no fault codes are generated because the board itself has no power.

• Specs: 40VA rated | 120V primary / 24V secondary | Class 2 transformer | Replaces OEM part number HT01BD209 | Factory-matched output tolerance
• OEM vs Generic: OEM transformers are wound and rated to exact factory specifications, ensuring stable 24V output under full load. Generic units frequently under-deliver voltage under load, causing erratic thermostat behavior, nuisance lockouts, and premature contactor failure.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify voltage is absent before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all low-voltage wiring connections before disconnecting. Secondary terminals are color-coded for straightforward reinstallation.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Designed and verified for the Payne PA3ZNB036000AA 3-ton split-system 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 — order with confidence and get back to comfort fast.