OEM Carrier 40VA Control Transformer 208/240V to 24V for Model PY3PPA030060AA

This OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3PPA030060AA HVAC system. The transformer steps down the 208/240V line voltage to the 24V signal required to power the control board, thermostat, and all low-voltage safety circuits. When it fails, every controlled function in the system goes dark — the thermostat goes blank, the system won't respond to calls for heating or cooling, and no low-voltage components will energize. If your system appears completely unresponsive despite 240V line power being present, a failed transformer is one of the first components to check.

• Specs: Input (Primary) Voltage: 208/240V AC | Output (Secondary) Voltage: 24V AC | Frequency: 50/60 Hz | Power Rating: 40VA | OEM Part #: HT01BD209
• OEM vs Generic: This is the exact factory OEM unit — same winding specifications, insulation class, and VA rating as installed at the factory. Generic transformers often underperform on VA capacity under full load, causing nuisance control dropouts and premature failure.
• Install Difficulty: 2/5 — Shut off all power to the unit before beginning. Locate the transformer in the control compartment, photograph all wiring connections, then disconnect and swap. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Verify 24V output before closing the panel.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Engineered to fit the Carrier PY3PPA030060AA. Always verify your unit's model and serial number against your data plate before ordering. Not sure it fits? Our parts specialists confirm fitment before you buy — order with confidence and get back up and running today.