OEM Payne Transformer 40VA 120V to 24V Control Circuit for PA3ZNB048000AB

This is the factory OEM replacement transformer (part number HT01BD209) for the Payne PA3ZNB048000AB packaged air conditioning unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage control wiring. When the transformer fails — due to a wiring short, voltage spike, or simply age — nothing in the system responds: the thermostat goes blank, the unit won't start, and no fault codes are generated because the control board itself has lost power.

• Specs: 40VA rated | 120V primary / 24V secondary | Compatible with standard 24V control circuits | Factory-matched to Payne PA3ZNB048000AB specifications | OEM part number HT01BD209
• OEM vs Generic: This OEM unit is wound to exact VA and voltage tolerances for the PA3ZNB048000AB. Undersized or off-tolerance generic transformers risk nuisance tripping, control board brownouts, and premature failure — especially if your system runs multiple 24V accessories like humidistats or zone boards.
• Install difficulty: 2/5 — Disconnect power at the disconnect box and verify zero voltage before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or terminal connectors, multimeter. Label all low-voltage wires before removing the old transformer. Confirm primary and secondary lead polarity before energizing.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Designed specifically for the Payne PA3ZNB048000AB packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists will confirm compatibility before your order ships — no guesswork required.