OEM Carrier Control Transformer 40VA 120V/24V for Model PY3PPA036060NB

This OEM control transformer (part number HT01BD209) is the factory-specified replacement for the Carrier PY3PPA036060NB packaged unit. The transformer steps down 120V line voltage to the 24V signal that powers your thermostat, contactor coil, and all low-voltage control logic. When it fails — due to a wiring short, overloaded secondary, or age — the entire control circuit goes dead: the thermostat goes blank, the system refuses to start, and no error codes are produced because the board itself has no power.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01BD209 | Factory-matched winding and enclosure dimensions for direct drop-in fit
• OEM vs Generic: This is the genuine Carrier factory part. OEM transformers are wound to exact VA and voltage tolerances, protecting sensitive control boards. Generic units often run hot under load and can fail prematurely or damage downstream components.
• Install Difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage before handling. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Always identify and eliminate the secondary short before installing the new transformer or it will blow immediately.
• Warranty: 1-year OEM factory warranty. Orders ship same business day from our warehouse when placed before 3 PM local time.

Compatibility: Engineered as a direct OEM replacement for the Carrier PY3PPA036060NB packaged unit. Always confirm the 120V/24V 40VA specification against your unit's wiring diagram and data plate before ordering. Have your model number ready — our fitment team is available to verify compatibility before you buy.