OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3PNA036060NB

This OEM control transformer (part number HT01BD209) is the factory-specified replacement for the Carrier PY3PNA036060NB packaged unit. The transformer steps down 208/240V line voltage to the 24V AC signal that powers every low-voltage component in your system — thermostat, contactor coil, gas valve, and control board. When it fails, the entire control circuit goes dead: the thermostat goes blank, the system won't respond to any call for heating or cooling, and you may measure zero volts at the 24V secondary terminals.

• Specs: 40VA rating | 208/240V primary input | 24V secondary output | 50/60 Hz | OEM part number HT01BD209 | Replaces HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage tolerances. Undersized or off-tolerance aftermarket transformers can trip on thermal overload or fail to sustain the 24V rail under full load, causing intermittent lockouts that are difficult to diagnose.
• Install difficulty: 2/5 — Shut off power at the disconnect before starting. Tools needed: flat-head and Phillips screwdrivers, multimeter, wire nuts or quick-connect terminals. Label or photograph all wiring before disconnecting. Verify 0V at the primary before handling wires.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3PNA036060NB packaged unit. Also compatible with select Bryant and Payne models sharing the same 40VA 208/240V–24V transformer specification — confirm your unit's data plate voltage requirements before ordering. Questions about fitment? Our team verifies compatibility before you order — contact us today and get your system back up and running fast.