OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3GNA048130NA

This is the genuine OEM control transformer for the Carrier PY3GNA048130NA packaged unit. The transformer steps down 208/240V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and every other low-voltage circuit in the system. When it fails — due to a shorted low-voltage wire, a failed component drawing excess current, or age-related winding breakdown — the entire control circuit goes dead. You'll see a blank thermostat, no response to any call for heating or cooling, and zero activity at the unit despite line power being present.

• Specs: 208/240V Primary | 24V Secondary | 40VA rated | 50/60 Hz | OEM Part# HT01BD209 | Also replaces HT01BD207, HT01CN232, 9076-00
• OEM vs Generic: OEM transformers are wound and potted to exact Carrier specifications, ensuring proper VA capacity and thermal protection. Generic units may be under-rated for VA draw in multi-stage systems, leading to premature failure or nuisance lockouts.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Always photograph existing wiring before removal. Inspect all 24V wiring for shorts before installing the new transformer — a shorted wire will burn out a new transformer immediately.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Factory-specified replacement for Carrier model PY3GNA048130NA. This transformer is also used across multiple Carrier, Bryant, and Payne platform units that share the 208/240V–24V 40VA specification — verify your unit's data plate and existing part number before ordering. Our team is available to confirm fitment prior to purchase. Order now — in stock and ships today.