OEM Carrier 40VA Control Transformer 208/240V to 24V — HT01BD209 for Model PY3PNA024060NA

This OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3PNA024060NA and a broad range of Carrier, Bryant, and Payne HVAC systems. The transformer steps down line voltage from 208/240V to the 24V AC signal that powers your thermostat, control board, gas valve, and all low-voltage safety circuits. When this component fails, the entire control circuit loses power — the result is a system that won't respond at all: no heating, no cooling, no fan, and no thermostat communication. A failed transformer is one of the first things to check when a system goes completely unresponsive.

• Specs: Input Voltage: 208/240V | Output Voltage: 24V | Power Rating: 40VA | Frequency: 50/60 Hz | OEM Part #: HT01BD209 | Also replaces HT01CN232
• OEM vs Generic: This is the genuine Carrier OEM transformer, wound and tested to exact factory specifications. Generic aftermarket transformers can introduce voltage instability that causes nuisance lockouts, control board damage, and premature component failure across the entire low-voltage circuit.
• Install Difficulty: 2/5 — Always shut off power at the breaker and disconnect the disconnect before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter (verify 0V before touching wires), wire nuts or spade connectors. Photograph all wiring connections before removal. Match wire colors carefully on reinstall.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3PNA024060NA and compatible with numerous Carrier, Bryant, and Payne residential and light-commercial heating and cooling systems requiring a 208/240V primary, 24V secondary, 40VA control transformer. Always verify the voltage and VA rating on your unit's data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today and get your system back online fast.