OEM Carrier Control Transformer 40VA 208/230V–24V for Model PY2PPB030040NB

This is the genuine OEM Carrier control transformer (part #HT01BD209) factory-specified for the Carrier PY2PPB030040NB packaged unit. The transformer steps down line voltage from 208/230V to the 24V signal required to power your thermostat, control board, and all low-voltage safety circuits. When the transformer fails, the result is total loss of control voltage — the thermostat goes blank, the system won't respond to any call for heating or cooling, and no low-voltage components function. A failed transformer is often misdiagnosed as a bad control board, making correct identification critical before replacement.

• Specs: 40VA capacity | 208/230V primary input | 24V secondary output | 50/60 Hz | Class 2 control transformer | Weight approx. 1.0–1.32 lbs
• OEM vs Generic: This factory-original OEM unit is wound to exact Carrier tolerances, ensuring stable 24V output under load. Generic aftermarket transformers may sag under full VA draw, causing nuisance lockouts and intermittent control failures that are difficult to diagnose.
• Install difficulty: 2/5 — Shut off all power and verify with a multimeter before starting. Disconnect low-voltage wires (label each), remove mounting screws, swap transformer, and reconnect. Tools needed: flathead/Phillips screwdriver, multimeter, wire labels. Always confirm 24V output at secondary terminals before buttoning up the panel.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse.

Compatibility: Designed for the Carrier PY2PPB030040NB packaged unit. Also replaces OEM part numbers HT01BD207, HT01CN232, and 9076-00. Verify your unit's data plate voltage before ordering — confirm 208/230V primary. Questions about fitment? Our team verifies compatibility before you order — call or chat now and we'll confirm the right part for your unit.