OEM Carrier Control Transformer 40VA 208/230V to 24V for Model PY3GNA036060NA

The Carrier HT01BD209 is the factory-specified 40VA step-down control transformer for the PY3GNA036060NA system. It converts the unit's 208/230V line voltage down to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, gas valve, and all safety switches. When this transformer fails, the entire control circuit goes dark: the thermostat loses power, the system won't respond to any call for heating or cooling, and in some cases a blown internal fuse will indicate a downstream short that took the transformer with it.

• Specs: 40VA rating | 208/230V primary | 24V secondary | 50/60Hz | Compact steel frame housing | Replaces OEM part numbers HT01BD207, HT01CN232, and 4000A46E07AE28
• OEM vs Generic: This is the genuine factory OEM part, wound to exact Carrier tolerances. Generic aftermarket transformers often underperform under peak VA load, causing nuisance shutdowns and premature failure of downstream controls.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output post-install). Always photograph wiring before disconnecting leads. Check for a shorted downstream component if the old transformer failed — a short will kill a new unit just as fast.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PY3GNA036060NA system. Verify your unit's data plate shows 208/230V primary and 24V control voltage before ordering. Cross-reference OEM part numbers HT01BD207, HT01CN232, or 4000A46E07AE28 also confirm fitment. Our parts team is available to verify fitment before you order — no guessing required.