OEM Carrier Control Transformer 40VA 208/230V–24V for Model PY3GNA048130NB

This is the genuine OEM control transformer for the Carrier PY3GNA048130NB packaged HVAC unit. The transformer steps down 208/230V line voltage to the 24V signal required by your thermostat, contactor coil, gas valve, and control board. When it fails, the entire low-voltage control circuit goes dark — symptoms include a completely unresponsive thermostat, a system that won't call for heating or cooling, or a tripped secondary fuse with no obvious short elsewhere in the circuit.

• Specs: 40VA capacity | 208/230V primary | 24V secondary | 50/60 Hz | OEM part number HT01BD209 | Replaces superseded part numbers HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: The OEM transformer is wound and potted to Carrier's exact VA rating and insulation class. Generic aftermarket transformers frequently run undersized VA ratings, causing thermal overload under full control-circuit load and nuisance fuse trips.
• Install Difficulty: 2/5 — Shut off power at the disconnect and verify zero voltage before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Label or photograph all wiring connections (R, C, and line-side terminals) before removal. Confirm secondary output reads ~24–28V AC after installation.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Factory-matched replacement for Carrier model PY3GNA048130NB. Also a direct replacement for other Carrier, Bryant, and Payne units originally equipped with HT01BD207 or HT01CN232 transformers — always confirm your unit's voltage requirements on the data plate before ordering. Our fitment team is available to verify compatibility before you buy.