OEM Carrier Control Transformer 40VA 208/230V to 24V — Model PY3GNAA48130NA

This is the genuine OEM control transformer for the Carrier PY3GNAA48130NA packaged unit. The transformer steps down line voltage (208/230V primary) to the 24V secondary signal that powers your thermostat, control board, and all low-voltage safety circuits. When this transformer fails, the entire control circuit goes dark — you'll see a blank thermostat display, no response to any system calls, or tripped fuses on the secondary side. It is one of the first components to check on any no-power, no-response service call.

• Specs: 208/230V Primary | 24V Secondary | 40VA Rating | 50/60 Hz | OEM Part# HT01BD209 | Also replaces HT01BD207, HT01CN232, 9076-00
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage tolerances. Undersized or off-spec aftermarket units can starve control boards of voltage, causing nuisance lockouts and premature board failure — the OEM unit eliminates that risk entirely.
• Install Difficulty: 2/5 — Shut off all power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label and photograph all 24V wiring connections before disconnecting. Verify secondary output (24–28VAC) with a meter before reassembling the panel.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Factory-specified replacement transformer for Carrier model PY3GNAA48130NA packaged units. Also a direct replacement for legacy OEM part numbers HT01BD207, HT01CN232, and 9076-00. Always confirm primary voltage on your unit's data plate matches 208/230V before ordering. Our fitment team is available to verify compatibility before you buy — reach out before placing your order if you have any questions.