OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3GPAA42060NA

This OEM Carrier control transformer (part number HT01BD209) is the factory-specified replacement for the Carrier PY3GPAA42060NA packaged unit. The transformer steps down line voltage (208/240V) to the 24V low-voltage signal required by the thermostat, control board, contactor coil, and all other 24V control circuit components. When this part fails, the entire control circuit goes dead — no thermostat response, no contactor pull-in, and no system operation. A failed transformer is often misdiagnosed as a control board issue, making correct identification critical before ordering other components.

• Specs: 208/240V Primary | 24V Secondary | 40VA | 50/60Hz | OEM Part# HT01BD209 | Also supersedes HT01BD207, HT01CN232, 9076-00
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact VA and voltage tolerances. Undersized or off-tolerance aftermarket units can cause erratic cycling, nuisance tripping, or premature control board failure due to voltage sag under load.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output after install). Label all wires before disconnecting. Typical job time: 20–30 minutes.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for Carrier PY3GPAA42060NA packaged HVAC equipment. Verify your unit's data plate lists a 208/240V primary and 24V secondary control circuit before ordering. Our fitment team is available to confirm compatibility before you buy — order with confidence and get your system running today.