OEM Carrier Control Transformer 40VA 208/230V for Model PY3PNA048130AB

This is the genuine OEM Carrier control transformer (part #HT01BD209) factory-specified for the Carrier PY3PNA048130AB packaged HVAC unit. The transformer steps line voltage down from 208/230V to a stable 24V signal that powers the thermostat, control board, contactors, and every other low-voltage component in your system. When this transformer fails — often from a shorted control wire or a failed component drawing excess current — the entire 24V control circuit goes dead: your thermostat goes blank, the system will not respond to any command, and nothing turns on. Replacing this transformer is the essential first step in restoring full system operation.

• Specs: 208/230V primary | 24V secondary | 40VA rated | 50/60 Hz | Replaces OEM part numbers HT01BD207 and HT01CN232
• OEM vs Generic: This OEM unit is wound and insulated to Carrier's exact VA tolerance and thermal rating. Undersized or off-spec generic transformers can overheat, trip their internal fuse, or fail again within weeks — especially if the original root-cause short has not been fully resolved.
• Install difficulty: 2/5 — Shut off all power to the unit before proceeding. Tools needed: multimeter (to confirm 0V before touching wires and 24V output after install), flathead and Phillips screwdrivers, wire nuts or spade connectors. Photograph all wire connections before disconnecting. Check all low-voltage wiring for shorts before energizing the new transformer.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY3PNA048130AB packaged units requiring a 208/230V primary, 24V secondary, 40VA control transformer. Confirm input voltage on your unit's data plate before ordering. Our fitment team is available to verify compatibility before you buy — don't hesitate to reach out.