OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3GNAA36060AA

This OEM control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3GNAA36060AA packaged unit. The transformer steps down the 208/240V line voltage to the 24V signal used by thermostats, control boards, contactors, and every other low-voltage component in the system. When it fails, the entire control circuit goes dead — nothing responds, the thermostat goes blank, and the unit will not start at all. A failed transformer is one of the most commonly misdiagnosed HVAC faults; technicians often replace the control board first, only to discover the transformer was the culprit.

• Specs: 40VA rating | 208/240V primary | 24V secondary | 50/60Hz | OEM part #HT01BD209 | Cross-references: HT01BD207, HT01CN232, 9076-00
• OEM vs Generic: This OEM transformer is wound to exact factory VA tolerances. Undersized or out-of-spec generic transformers overheat under load, tripping thermal cutoffs repeatedly and shortening the life of your control board.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: multimeter, flathead and Phillips screwdrivers, needle-nose pliers. Confirm 0V at primary terminals before touching wires. Photograph all wire connections before removal.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Verified fit for Carrier model PY3GNAA36060AA. Always confirm input voltage on your unit's data plate matches the 208/240V primary rating before ordering. Need help confirming fitment? Our HVAC parts team verifies compatibility before you buy — order with confidence.