OEM Carrier 40VA Control Transformer 208/240V to 24V — HT01BD209 for Model PY3GNA060090NA

This OEM Carrier transformer (part #HT01BD209) is the factory-specified control voltage transformer for the Carrier PY3GNA060090NA packaged unit. The transformer steps down the 208/240V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dark — the thermostat loses power, no heating or cooling stages respond, and the system appears completely dead. Replacing it with the correct OEM part restores factory-spec voltage regulation instantly.

• Specs: Input (Primary) Voltage: 208/240V | Output (Secondary) Voltage: 24V | Frequency: 50/60 Hz | Power Rating: 40VA | OEM Part #: HT01BD209
• OEM vs Generic: This factory OEM transformer is wound to exact Carrier tolerances, ensuring stable 24V output under full load. Generic transformers often run slightly over or under voltage, causing nuisance lockouts, contactor chatter, and premature control board failure.
• Install Difficulty: 2/5 — Turn off all power at the disconnect and breaker before proceeding. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wires before disconnecting. Verify 24V output with a multimeter after installation before closing the panel.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3GNA060090NA packaged gas/electric unit. Verify your unit's data plate shows a 208/240V primary control circuit before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before every order — reach out before you buy.