OEM Payne 40VA Control Transformer for Model PA3ZNB030000AB

This OEM replacement transformer (part number HT01BD209) is the factory-specified control circuit transformer for the Payne PA3ZNB030000AB air conditioner. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, contactor coil, and control board. When this component fails, the entire control circuit goes dead — the thermostat display may go blank, the system will not respond to any commands, and no heating or cooling will occur. It is one of the first components to check when a system shows absolutely zero response.

• Specs: 40VA rated | 120V primary / 24V secondary | Class 2 transformer | Direct OEM replacement for part number HT01BD209 | ±5% output voltage tolerance
• OEM vs Generic: This is the factory OEM part built to Payne's exact VA rating and insulation class. Generic transformers frequently underperform at rated load, causing erratic control behavior, nuisance tripping, and premature failure of downstream components like contactors and control boards.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Always label or photograph wire connections before disconnecting. A blown transformer may indicate a short elsewhere in the control circuit — inspect low-voltage wiring for damage before energizing the replacement.
• Warranty: 1-year OEM factory warranty against defects. Orders ship same business day from our climate-controlled warehouse.

Compatibility: Designed as a direct OEM replacement for the Payne PA3ZNB030000AB unit. Verify your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering to ensure a proper match. Our parts specialists are available to confirm fitment — reach out before you order if you have any questions. In stock and ready to ship today.