OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3PNA060090AA

This OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3PNA060090AA HVAC system. The transformer steps down 208/240V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dark — the thermostat goes blank, the system will not respond to any commands, and no heating or cooling is possible. Replacing the transformer with a genuine OEM part restores reliable control circuit operation immediately.

• Specs: 208/240V Primary | 24V Secondary | 40VA rated | 50/60 Hz | OEM Part #HT01BD209 | Also replaces HT01BD207, HT01CN232, 9076-00
• OEM vs Generic: OEM transformers are wound to exact factory VA and voltage tolerances. Undersized or off-tolerance aftermarket units can cause nuisance tripping, control board brownouts, and shortened component life across the entire low-voltage circuit.
• Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: multimeter, flathead and Phillips screwdrivers, needle-nose pliers, wire nuts or spade connectors. Photograph all wiring connections before disconnecting. Verify 24V output with a multimeter before reassembling the unit.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY3PNA060090AA. Verify input voltage (208/240V) on your unit's data plate before ordering. This part also cross-references to Carrier/Bryant/Payne systems using HT01BD207, HT01CN232, or 9076-00. Not sure if this is the right part? Our HVAC parts team verifies fitment before you order — contact us today.