OEM Carrier Control Transformer 40VA 208/230V to 24V for Model PY3GNA042060NB

This is the genuine OEM control transformer (part number HT01BD209) factory-specified for the Carrier PY3GNA042060NB packaged unit. The transformer steps down 208/230V line voltage to the 24V that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When it fails — due to a short in the control circuit, a failed component drawing excess current, or simple age — the entire system goes dark: no thermostat display, no call response, nothing. Replacing it is the fastest way to restore control circuit power.

• Specs: 40VA capacity | 208/230V primary input | 24V secondary output | 50/60 Hz | OEM part number HT01BD209 | Replaces legacy part numbers HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: This is the factory-matched Carrier OEM transformer, built to exact VA and voltage tolerances. Generic transformers frequently run at subrated VA output, causing nuisance tripping, control board brownouts, and premature component failure — especially under high-load conditions.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Always photograph existing wiring before disconnecting. A blown transformer is often caused by a downstream short — inspect wiring and components before powering back up.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Direct OEM replacement for Carrier model PY3GNA042060NB packaged units. Also cross-references to Bryant and Payne models using the same transformer platform. Verify your existing transformer's VA rating and primary voltage on the data plate before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — order now and get it shipped today.