OEM Carrier 40VA Control Transformer HT01BD209 for Model PY3GPAA60130NA

This OEM control transformer is the factory-specified replacement for the Carrier PY3GPAA60130NA packaged unit. The transformer steps down 120V (or 240V, depending on configuration) line voltage to the 24V signal required by your thermostat, control board, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dark — the thermostat loses power, the contactor coil cannot be energized, and the system produces no heating or cooling response whatsoever. Replacing a failed transformer with the correct OEM-rated unit restores full control circuit integrity immediately.

• Specs: 40VA rated output | 24V secondary | 120V/240V primary | OEM part number HT01BD209 | Factory-matched impedance and thermal cutoff rating
• OEM vs Generic: This is the exact factory-specified transformer. Generic alternatives frequently use lower-grade lamination cores and thinner windings, which run hotter and fail sooner — especially on units with multiple 24V accessories such as humidifiers, ERVs, or zoning boards drawing near the VA limit.
• Install Difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 0V before touching terminals, and 24V output after install). Note wire colors and terminal labels before disconnecting the old unit.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before the daily cutoff.

Compatibility: Engineered as the direct OEM replacement for Carrier PY3GPAA60130NA packaged units. Always verify your unit's data plate voltage configuration (120V or 240V primary) matches the transformer specification before installation. Have your model and serial number ready — our fitment team is available to confirm compatibility before you order. In stock and ships today.