OEM Payne 40VA Control Transformer for Model PA3ZPA036000AA

This OEM replacement transformer (part# HT01BD209) is the factory-specified control circuit transformer for the Payne PA3ZPA036000AA packaged air conditioner. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, contactor coil, control board, and all low-voltage safety circuits. When it fails, nothing in the system responds — the thermostat goes dark, the unit won't energize, and no fault codes are generated because the control circuit itself has no power.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 output | OEM part number HT01BD209 | Factory-matched impedance and thermal protection
• OEM vs Generic: OEM transformers are wound to exact VA and impedance specs for the Payne control board. Undersized or off-spec generic units can overheat, blow the secondary fuse repeatedly, or starve multi-stage contactors of sufficient current to pull in reliably.
• Install difficulty: 2/5 — Disconnect power at the disconnect box before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Always verify 24V output before reassembling the panel. Check and replace the 3A or 5A inline fuse on the secondary if present.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Payne PA3ZPA036000AA 3-ton packaged air conditioner. Verify your existing transformer's VA rating and primary/secondary voltage on the data plate or old unit label before ordering. If your breaker trips or fuse blows immediately on startup, inspect the low-voltage wiring for shorts before replacing the transformer. Our parts specialists are available to confirm fitment before you order — get the right part the first time and have your system back online today.