OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3GPAA60115NA

This OEM control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3GPAA60115NA packaged unit. Its job is to step down line voltage from 208/240V to a stable 24V AC signal that powers the entire control circuit — including the thermostat, contactor coil, gas valve, and all safety switching. When this transformer fails, the result is typically a completely unresponsive system: the thermostat goes dark, the unit won't start, and no control functions operate at all. A blown internal fuse or shorted secondary winding are the most common failure modes.

• Specs: 208/240V primary | 24V secondary | 40VA rating | 50/60 Hz | OEM part #HT01BD209 | Also replaces HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: This factory OEM transformer is wound to exact VA and voltage tolerances. Generic units can drift under load, causing nuisance tripping of downstream controls or premature fuse failure — a small shortcut that creates a much bigger callback.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Always label and photograph wiring before disconnecting. Replace any blown inline fuse on the secondary as part of this repair.
• Warranty: 1-year OEM factory warranty. In stock and ships the same business day from our warehouse.

Compatibility: Designed for Carrier model PY3GPAA60115NA packaged gas/electric units. Also cross-references OEM part numbers HT01BD207, HT01CN232, and 9076-00 — verify your unit's data plate before ordering. Need help confirming fitment? Our HVAC parts team is standing by. Order today and your part ships today.