OEM Carrier Control Transformer 40VA 208/230V–24V for Model PY3PNA060115AB

The Carrier HT01BD209 is the factory-original 40VA control transformer for the PY3PNA060115AB packaged gas/electric unit. This transformer steps down 208/230V line voltage to the 24V DC signal that powers your thermostat, control board, gas valve, and every other low-voltage component in the system. When it fails — due to a short, overload, or age — you'll typically see a completely unresponsive system: no thermostat display, no call-for-heat, and no error codes because the control circuit has lost all power. Replacing the transformer is one of the fastest, highest-impact repairs in HVAC service.

• Specs: 40VA rating | 208/230V primary input | 24V secondary output | 50/60 Hz | Factory-matched OEM tolerances | Replaces HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: OEM transformers are wound to exact VA and impedance specs, protecting downstream components — control boards and gas valves — from voltage fluctuations that cause premature failure. Generic units vary in VA capacity and insulation class, increasing risk of nuisance tripping and shortened service life.
• Install difficulty: 2/5 — Always shut off power at the breaker and confirm zero voltage with a multimeter before touching any wiring. Photograph all wire connections before disconnecting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Re-check for shorts on the secondary circuit before energizing to protect the new transformer.
• Warranty: 1-year OEM factory warranty. In stock — ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY3PNA060115AB. Also compatible with other Carrier, Bryant, and Payne units specifying the HT01BD209, HT01BD207, or HT01CN232 transformer. Verify your unit's data plate voltage requirements before ordering. Our fitment team is available to confirm compatibility before you buy.